chore: bump version to 0.2.8

新增：
- BrandCropModal 品牌图裁剪弹窗 + cropImage 工具
- Markdown 行内短代码（inlineShortcodes + remark 插件）
- MdDetails 折叠块、MdVideo 视频块组件
- directiveBlocks/inlineShortcodes 测试

其它：
- 聊天后端（handler/service chat）调整
- Markdown 渲染链路、编辑器、全局样式与品牌相关面板更新

.gitignore

@@ -8,6 +8,8 @@ out/
 .vercel/
 *.tsbuildinfo
 next-debug.log*
+# postbuild 抽取的字体声明（scripts/extract-font-css.mjs 生成）
+frontend/public/fonts/
 
 # ===== Go 构建产物 =====
 *.exe

VERSION

@@ -1 +1 @@
-0.2.2
+0.2.8

backend/config/config_test.go

@@ -257,7 +257,7 @@ func TestEnsureAppIniBackfillsMissingKeys(t *testing.T) {
 
 func TestParseSiteURLFromIni(t *testing.T) {
 	work := t.TempDir()
-	body := "[security]\nJWT_SECRET = "+testJWTSecret+"\n\n[app]\nDEV_MODE = true\nSITE_URL = https://forum.example.com/\nCORS_ORIGINS = https://a.example.com, https://b.example.com/\n"
+	body := "[security]\nJWT_SECRET = " + testJWTSecret + "\n\n[app]\nDEV_MODE = true\nSITE_URL = https://forum.example.com/\nCORS_ORIGINS = https://a.example.com, https://b.example.com/\n"
 	if err := os.WriteFile(filepath.Join(work, "app.ini"), []byte(body), 0600); err != nil {
 		t.Fatal(err)
 	}

backend/handler/admin_legacy_import.go

@@ -119,7 +119,7 @@ func optionalLegacyZip(c *gin.Context, field, pattern, label string) (string, bo
 		return "", true // 字段不存在，视为未上传
 	}
 	if fh.Size > service.LegacyZipMaxBytes {
-		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": label+"不能超过 128MB"})
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": label + "不能超过 128MB"})
 		return "", false
 	}
 	path, err := saveMultipartToTemp(fh, pattern)

backend/handler/admin_user.go

@@ -94,6 +94,41 @@ func (h *Handlers) AdminSetUserMessages(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"user": user})
 }
 
+// AdminGetUserPerms 读取账号级渠道权限（超管/站长，授权弹窗回显用）
+func (h *Handlers) AdminGetUserPerms(c *gin.Context) {
+	id, ok := parseAdminUserID(c)
+	if !ok {
+		return
+	}
+	perms, err := h.AdminUser.GetPermOverrides(middleware.CurrentActor(c), id)
+	if err != nil {
+		respondAdminUserError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"perm_overrides": perms})
+}
+
+// AdminSetUserPerms 授予/撤销账号级渠道权限（超管/站长）
+func (h *Handlers) AdminSetUserPerms(c *gin.Context) {
+	id, ok := parseAdminUserID(c)
+	if !ok {
+		return
+	}
+	var body struct {
+		Perms []string `json:"perms"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	user, err := h.AdminUser.SetPermOverrides(middleware.CurrentActor(c), id, body.Perms)
+	if err != nil {
+		respondAdminUserError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"user": user})
+}
+
 // AdminSetUserBan 封禁 / 解封用户
 func (h *Handlers) AdminSetUserBan(c *gin.Context) {
 	id, ok := parseAdminUserID(c)

backend/handler/auth.go

@@ -15,15 +15,15 @@ import (
 )
 
 var (
-	accessCookieMaxAge  = int(service.AccessTokenTTL.Seconds())  // 15 分钟
-	refreshCookieMaxAge = int(service.RefreshTokenTTL.Seconds()) // 7 天
+	accessCookieMaxAge  = int(service.AccessTokenTTL.Seconds())  // 7 天
+	refreshCookieMaxAge = int(service.RefreshTokenTTL.Seconds()) // 30 天
 )
 
 // setAuthCookies 设置认证 cookie：
-//   - access token（HttpOnly，15min）
-//   - refresh token（HttpOnly，7天，Path=/，供 Next middleware 在页面/RSC
+//   - access token（HttpOnly，7天）
+//   - refresh token（HttpOnly，30天，Path=/，供 Next middleware 在页面/RSC
 //     请求中读取并静默轮转；仅 /api/auth/refresh 端点消费）
-//   - CSRF token（JS 可读，7天，双提交校验）
+//   - CSRF token（JS 可读，与 refresh 同寿命（30天），双提交校验）
 //
 // SameSite=Lax：允许外站顶级链接进入时保留登录态（Strict 会导致从外站
 // 跳转进来的第一次请求丢 cookie，把已登录用户误判为游客）；状态变更请求
@@ -242,13 +242,21 @@ func (h *Handlers) Refresh(c *gin.Context) {
 	}
 	accessToken, newRefresh, user, err := h.Auth.RotateRefreshToken(refreshToken, c.ClientIP(), c.Request.UserAgent())
 	if err != nil {
-		clearAuthCookies(c, !h.Cfg.DevMode)
 		if errors.Is(err, service.ErrAccountBanned) {
 			// 账号已封禁：清 cookie 的同时给出可识别 code，前端弹封禁告知并强制下线
+			clearAuthCookies(c, !h.Cfg.DevMode)
 			c.JSON(http.StatusForbidden, gin.H{"error": "账号已被封禁", "code": "account_banned"})
 			return
 		}
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "登录已过期，请重新登录"})
+		if errors.Is(err, service.ErrRefreshInvalid) || errors.Is(err, service.ErrRefreshExpired) {
+			// 登录态确实失效：清 cookie 要求重新登录（前端弹"登录已失效"）
+			clearAuthCookies(c, !h.Cfg.DevMode)
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "登录已过期，请重新登录"})
+			return
+		}
+		// 其他错误（数据库抖动等）：服务暂不可用。保留 cookie 等下次刷新，
+		// 前端按瞬态失败处理（不弹"登录已失效"、不强制重登）
+		c.JSON(http.StatusServiceUnavailable, gin.H{"error": "登录刷新暂不可用，请稍后重试"})
 		return
 	}
 	setAuthCookies(c, accessToken, newRefresh, !h.Cfg.DevMode)
@@ -265,7 +273,8 @@ func (h *Handlers) Refresh(c *gin.Context) {
 
 // Logout 登出：仅撤销本次请求携带的那枚 refresh token（单设备登出语义，
 // 不影响该用户其他设备的登录态），并清除所有认证 cookie。
-// access JWT 无状态、15 分钟自然过期；登出后 tv 不递增，属可接受的短窗口。
+// access JWT 登出后 tv 不递增，但链头已撤销 → familySessionActive 为 false，
+// ValidateClaims 在每个请求上即时拒绝旧 JWT，长 TTL 下亦无残留有效窗口。
 func (h *Handlers) Logout(c *gin.Context) {
 	if refreshToken, err := c.Cookie(service.RefreshCookieName); err == nil && refreshToken != "" {
 		_ = h.Auth.RevokeRefreshToken(refreshToken)
@@ -373,8 +382,11 @@ func meUserBody(user *model.User, boardIDs []uint, badges []model.UserBadge) gin
 		"role":                user.Role,
 		"board_ids":           boardIDs,
 		"can_manage_messages": user.CanManageMessages,
-		"level":               user.Level,
-		"total_points":        user.TotalPoints,
+		// 生效权限码（角色默认 ∪ 账号级渠道授予）：前端据此渲染后台入口/按钮，
+		// 最终权限以后端 RequirePerm 校验为准
+		"perms":        service.EffectivePerms(user.Role, user.PermOverrides, user.CanManageMessages),
+		"level":        user.Level,
+		"total_points": user.TotalPoints,
 	}
 	if badges != nil {
 		body["badges"] = badges

backend/handler/board.go

@@ -51,11 +51,11 @@ func (h *Handlers) BoardSidebar(c *gin.Context) {
 		}
 	}
 	c.JSON(http.StatusOK, gin.H{
-		"board":         data.Board,
-		"moderators":    data.Moderators,
-		"stats":         data.Stats,
-		"hot":           data.Hot,
-		"active_users":  data.ActiveUsers,
-		"checkin":       data.Checkin,
+		"board":        data.Board,
+		"moderators":   data.Moderators,
+		"stats":        data.Stats,
+		"hot":          data.Hot,
+		"active_users": data.ActiveUsers,
+		"checkin":      data.Checkin,
 	})
 }

backend/handler/chat.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"net/http"
 	"strconv"
+	"time"
 
 	"github.com/freefire/jiang13-bbs/middleware"
 	"github.com/freefire/jiang13-bbs/model"
@@ -42,6 +43,26 @@ func chatRoomID(c *gin.Context) (uint, bool) {
 	return uint(id), true
 }
 
+// formatMuteDurationCN 禁言时长中文格式化，供系统提示消息使用
+func formatMuteDurationCN(minutes int) string {
+	switch {
+	case minutes >= 30*24*60:
+		return "30 天"
+	case minutes >= 7*24*60:
+		return "7 天"
+	case minutes >= 3*24*60:
+		return "3 天"
+	case minutes >= 24*60:
+		return "1 天"
+	case minutes >= 12*60:
+		return "12 小时"
+	case minutes >= 60:
+		return "1 小时"
+	default:
+		return strconv.Itoa(minutes) + " 分钟"
+	}
+}
+
 func (h *Handlers) chatOversee(userID uint) bool {
 	actor, err := h.Auth.LoadActor(userID)
 	if err != nil || actor == nil {
@@ -322,7 +343,7 @@ func (h *Handlers) KickChatMember(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"ok": true})
 }
 
-// SetChatMemberMute 禁言/解禁成员
+// SetChatMemberMute 禁言/解禁成员；duration_minutes 可选：0/缺省=永久，>0=指定分钟数
 func (h *Handlers) SetChatMemberMute(c *gin.Context) {
 	claims := middleware.CurrentUser(c)
 	roomID, ok := chatRoomID(c)
@@ -335,17 +356,58 @@ func (h *Handlers) SetChatMemberMute(c *gin.Context) {
 		return
 	}
 	var body struct {
-		Muted bool `json:"muted"`
+		Muted           bool `json:"muted"`
+		DurationMinutes int  `json:"duration_minutes"`
 	}
 	if err := c.ShouldBindJSON(&body); err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
 		return
 	}
-	if err := h.Chat.SetMemberMute(claims.ID, roomID, uint(targetID), body.Muted, h.chatOversee(claims.ID)); err != nil {
+	duration := time.Duration(body.DurationMinutes) * time.Minute
+	targetName, err := h.Chat.SetMemberMute(claims.ID, roomID, uint(targetID), body.Muted, duration, h.chatOversee(claims.ID))
+	if err != nil {
 		c.JSON(chatErrToStatus(err), gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"ok": true, "muted": body.Muted})
+	// 向房间内广播禁言/解禁事件，客户端据此更新输入框状态与成员列表
+	var mutedUntil *time.Time
+	if body.Muted && body.DurationMinutes > 0 {
+		t := time.Now().Add(duration)
+		mutedUntil = &t
+	}
+	// 落库一条系统提示消息，刷新后仍可见（走 SendSystemMessage 统一处理房间 last_message_id 等）
+	var sysContent string
+	if body.Muted {
+		if body.DurationMinutes > 0 {
+			sysContent = targetName + " 已被禁言 " + formatMuteDurationCN(body.DurationMinutes)
+		} else {
+			sysContent = targetName + " 已被禁言 永久"
+		}
+	} else {
+		sysContent = targetName + " 的禁言已被解除"
+	}
+	sysMsg, _ := h.Chat.SendSystemMessage(roomID, sysContent)
+	// 广播系统消息到房间（sender_id=0，前端按系统消息渲染）；
+	// Data 与普通消息一致直接放消息体（扁平结构），前端按 room_id 匹配后才能即时上屏
+	if sysMsg != nil && sysMsg.ID > 0 {
+		h.Hub.BroadcastRoom(realtime.RoomChat(roomID), realtime.Envelope{
+			Type: realtime.EventChatMessage,
+			Data: sysMsg,
+		})
+	}
+	h.Hub.BroadcastRoom(realtime.RoomChat(roomID), realtime.Envelope{
+		Type: realtime.EventChatMemberMuted,
+		Data: gin.H{
+			"room_id":         roomID,
+			"user_id":         uint(targetID),
+			"muted":           body.Muted,
+			"muted_until":     mutedUntil,
+			"duration_minutes": body.DurationMinutes,
+			"target_name":     targetName,
+			"operator_id":     claims.ID,
+		},
+	})
+	c.JSON(http.StatusOK, gin.H{"ok": true, "muted": body.Muted, "duration_minutes": body.DurationMinutes})
 }
 
 // SetChatMemberRole 站长任命/撤销群管理员
@@ -619,7 +681,9 @@ func (h *Handlers) broadcastChatRecalled(roomID uint, msg *model.ChatMessage, ne
 	}
 	env := realtime.Envelope{Type: realtime.EventChatRecalled, Data: data}
 	h.Hub.BroadcastRoom(realtime.RoomChat(roomID), env)
-	// 未订阅该房间的成员（侧栏在看别的会话）也需要实时改预览
+	// 未订阅该房间的成员（侧栏在看别的会话）也需要实时改预览：
+	// 已撤回正文不得残留在侧栏预览里。预览回滚到上一条真实消息由 RecallMessage
+	// 回退 last_message_id 完成，本推送只负责即时抹掉正文、不产生角标与置顶。
 	if h.Chat == nil {
 		return
 	}

backend/handler/comment.go

@@ -82,38 +82,6 @@ func (h *Handlers) PostComments(c *gin.Context) {
 	})
 }
 
-// CommentLocation 评论定位：返回该评论的楼层号（含软删占位，与楼层分页口径一致），
-// 供通知/主页评论深链 #comment-{id} 跨页时换到正确页码。0 楼 = 评论不存在。
-func (h *Handlers) CommentLocation(c *gin.Context) {
-	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的帖子 ID"})
-		return
-	}
-	cid, err := strconv.ParseUint(c.Param("cid"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的评论 ID"})
-		return
-	}
-	// 待审/被拒帖子的评论不对公众开放
-	var viewerID uint
-	var loadActor func() *service.Actor
-	if claims := middleware.CurrentUser(c); claims != nil {
-		viewerID = claims.ID
-		loadActor = h.actorLoader(claims.ID)
-	}
-	if err := h.Post.EnsurePostVisible(uint(id), viewerID, loadActor); err != nil {
-		c.JSON(http.StatusNotFound, gin.H{"error": "帖子不存在"})
-		return
-	}
-	floor := h.Comment.FloorNumber(uint(id), uint(cid))
-	if floor <= 0 {
-		c.JSON(http.StatusNotFound, gin.H{"error": "评论不存在"})
-		return
-	}
-	c.JSON(http.StatusOK, gin.H{"floor": floor})
-}
-
 // CreateCommentRequest 评论请求
 type CreateCommentRequest struct {
 	Content  string `json:"content" binding:"required,min=1,max=5000"`

backend/handler/friendlink.go

@@ -0,0 +1,208 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+
+	"github.com/freefire/jiang13-bbs/service"
+	"github.com/gin-gonic/gin"
+)
+
+// currentUserID 从 gin 上下文取登录用户 ID；RequireAuth 已保证存在
+func currentUserID(c *gin.Context) (uint, bool) {
+	v, ok := c.Get("user")
+	if !ok {
+		return 0, false
+	}
+	claims, ok := v.(*service.UserClaims)
+	if !ok || claims.ID == 0 {
+		return 0, false
+	}
+	return claims.ID, true
+}
+
+// GET /api/friend-links 公开列表（仅 approved）
+func (h *Handlers) GetFriendLinks(c *gin.Context) {
+	links, err := h.FriendLink.ListApproved()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取友情链接失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"links": links})
+}
+
+// POST /api/friend-links/apply 登录用户提交申请
+func (h *Handlers) ApplyFriendLink(c *gin.Context) {
+	uid, ok := currentUserID(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+	var in service.FriendLinkInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	fl, err := h.FriendLink.Apply(in, uid)
+	if err != nil {
+		if errors.Is(err, service.ErrFriendLinkInvalid) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "友情链接参数无效"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "提交申请失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"link": fl})
+}
+
+// GET /api/friend-links/mine 当前登录用户自己的申请记录（含待审/拒绝与拒绝理由）
+func (h *Handlers) MyFriendLinks(c *gin.Context) {
+	uid, ok := currentUserID(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+	links, err := h.FriendLink.ListMine(uid)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取申请记录失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"links": links})
+}
+
+// PUT /api/friend-links/:id 申请人修改自己的申请；已通过/已驳回的修改后回退待审
+func (h *Handlers) OwnerUpdateFriendLink(c *gin.Context) {
+	uid, ok := currentUserID(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	var in service.FriendLinkInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	if err := h.FriendLink.OwnerUpdate(uint(id), uid, in); err != nil {
+		if errors.Is(err, service.ErrFriendLinkNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "友情链接不存在"})
+			return
+		}
+		if errors.Is(err, service.ErrFriendLinkInvalid) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "友情链接参数无效"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存修改失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// GET /api/admin/friend-links 后台全量列表
+func (h *Handlers) AdminListFriendLinks(c *gin.Context) {
+	links, err := h.FriendLink.ListAll()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取友情链接失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"links": links})
+}
+
+// POST /api/admin/friend-links 站长直接新建（status=approved）
+func (h *Handlers) AdminCreateFriendLink(c *gin.Context) {
+	var in service.FriendLinkInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	fl, err := h.FriendLink.AdminCreate(in)
+	if err != nil {
+		if errors.Is(err, service.ErrFriendLinkInvalid) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "友情链接参数无效"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建友情链接失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"link": fl})
+}
+
+// PUT /api/admin/friend-links/:id 全量更新内容（不改 status）
+func (h *Handlers) AdminUpdateFriendLink(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	var in service.FriendLinkInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	if err := h.FriendLink.AdminUpdate(uint(id), in); err != nil {
+		if errors.Is(err, service.ErrFriendLinkNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "友情链接不存在"})
+			return
+		}
+		if errors.Is(err, service.ErrFriendLinkInvalid) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "友情链接参数无效"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "更新友情链接失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// POST /api/admin/friend-links/:id/status 审批：body {status, reject_reason?}
+func (h *Handlers) AdminSetFriendLinkStatus(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	var body struct {
+		Status       string `json:"status"`
+		RejectReason string `json:"reject_reason"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	if err := h.FriendLink.AdminSetStatus(uint(id), body.Status, body.RejectReason); err != nil {
+		if errors.Is(err, service.ErrFriendLinkNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "友情链接不存在"})
+			return
+		}
+		if errors.Is(err, service.ErrFriendLinkInvalid) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "审批参数无效"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "更新状态失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// DELETE /api/admin/friend-links/:id 软删除
+func (h *Handlers) AdminDeleteFriendLink(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	if err := h.FriendLink.AdminDelete(uint(id)); err != nil {
+		if errors.Is(err, service.ErrFriendLinkNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "友情链接不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除友情链接失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}

backend/handler/handlers.go

@@ -10,36 +10,38 @@ import (
 
 // Handlers 聚合所有服务引用
 type Handlers struct {
-	Ops          *service.Operations
-	Cfg          *config.Config
-	Hub          *realtime.Hub
-	Auth         *service.AuthService
-	Board        *service.BoardService
-	Post         *service.PostService
-	Comment      *service.CommentService
-	Like         *service.LikeService
-	Favorite     *service.FavoriteService
-	Follow       *service.FollowService
-	Notification *service.NotificationService
-	OverviewSvc  *service.OverviewService
-	Checkin      *service.CheckinService
-	Announcement *service.AnnouncementService
-	SitePage     *service.SitePageService
-	Upload       *service.UploadService
-	PostFile     *service.PostFileService
-	Points       *service.PointsService
-	Setting      *service.SettingService
-	AdminUser    *service.AdminUserService
-	LegacyImport *service.LegacyImportService
-	Moderation   *service.ModerationService
-	Chat         *service.ChatService
-	Visit        *service.VisitStatsService
-	Analytics    *service.AnalyticsService
-	HidePwd      *service.HidePasswordCookie
-	Ads          *service.AdService
-	Sidebar      *service.SidebarService
-	Badge        *service.BadgeService
+	Ops            *service.Operations
+	Cfg            *config.Config
+	Hub            *realtime.Hub
+	Auth           *service.AuthService
+	Board          *service.BoardService
+	Post           *service.PostService
+	Comment        *service.CommentService
+	Like           *service.LikeService
+	Favorite       *service.FavoriteService
+	Follow         *service.FollowService
+	Notification   *service.NotificationService
+	OverviewSvc    *service.OverviewService
+	Checkin        *service.CheckinService
+	Announcement   *service.AnnouncementService
+	SitePage       *service.SitePageService
+	Upload         *service.UploadService
+	PostFile       *service.PostFileService
+	Points         *service.PointsService
+	Setting        *service.SettingService
+	AdminUser      *service.AdminUserService
+	LegacyImport   *service.LegacyImportService
+	Moderation     *service.ModerationService
+	Chat           *service.ChatService
+	Visit          *service.VisitStatsService
+	Analytics      *service.AnalyticsService
+	HidePwd        *service.HidePasswordCookie
+	Ads            *service.AdService
+	Sidebar        *service.SidebarService
+	FriendLink     *service.FriendLinkService
+	Badge          *service.BadgeService
 	LeaderboardSvc *service.LeaderboardService
+	LibrarySvc     *service.LibraryService
 }
 
 // resolvePublishStatus 决定新帖/新评的初始状态：

backend/handler/library.go

@@ -0,0 +1,499 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+	"os"
+	"strconv"
+
+	"github.com/freefire/jiang13-bbs/middleware"
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/freefire/jiang13-bbs/service"
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+// ---------- 公开端 ----------
+
+// LibraryList 已发布条目目录
+func (h *Handlers) LibraryList(c *gin.Context) {
+	list, err := h.LibrarySvc.ListPublished()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取书库失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"docs": nonNilSlice(list)})
+}
+
+// LibraryDetail 公开条目详情（按 slug，仅已发布）
+func (h *Handlers) LibraryDetail(c *gin.Context) {
+	d, err := h.LibrarySvc.GetPublishedBySlug(c.Param("slug"))
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取条目失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"doc": d})
+}
+
+// LibraryFileDownload 强制下载（attachment；成功后计数）
+func (h *Handlers) LibraryFileDownload(c *gin.Context) {
+	f, ok := h.libraryPublicFile(c)
+	if !ok {
+		return
+	}
+	h.LibrarySvc.IncrDownload(f.ID)
+	c.Header("Content-Disposition", "attachment; filename*=UTF-8''"+url.PathEscape(f.Name))
+	c.Header("X-Content-Type-Options", "nosniff")
+	c.Header("Content-Security-Policy", "sandbox")
+	ct := f.MIME
+	if ct == "" {
+		ct = "application/octet-stream"
+	}
+	c.Header("Content-Type", ct)
+	c.File(h.LibrarySvc.FilePath(f))
+}
+
+// libraryPublicFile 公开文件公共校验（存在 + 所属条目已发布）
+func (h *Handlers) libraryPublicFile(c *gin.Context) (*model.LibraryFile, bool) {
+	id, err := strconv.ParseUint(c.Param("fid"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的文件 ID"})
+		return nil, false
+	}
+	f, err := h.LibrarySvc.GetPublicFile(uint(id))
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在"})
+		return nil, false
+	}
+	return f, true
+}
+
+// ---------- 管理端 ----------
+
+// AdminListLibraryDocs 后台条目列表（含未发布）
+func (h *Handlers) AdminListLibraryDocs(c *gin.Context) {
+	list, err := h.LibrarySvc.ListAll()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取书库失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"docs": nonNilSlice(list)})
+}
+
+// AdminCreateLibraryDoc 新建条目
+func (h *Handlers) AdminCreateLibraryDoc(c *gin.Context) {
+	var in service.LibraryInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	var creatorID uint
+	if claims := middleware.CurrentUser(c); claims != nil {
+		creatorID = claims.ID
+	}
+	d, err := h.LibrarySvc.Create(&in, creatorID)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"doc": d})
+}
+
+// AdminUpdateLibraryDoc 编辑条目
+func (h *Handlers) AdminUpdateLibraryDoc(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	var in service.LibraryInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	d, err := h.LibrarySvc.Update(uint(id), &in)
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) || errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"doc": d})
+}
+
+// AdminDeleteLibraryDoc 删除条目（软删）
+func (h *Handlers) AdminDeleteLibraryDoc(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	if err := h.LibrarySvc.Delete(uint(id)); err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// AdminPurgeLibraryDoc 彻底删除条目（仅限已软删；清除章节/文件行与磁盘文件）
+func (h *Handlers) AdminPurgeLibraryDoc(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	if err := h.LibrarySvc.Purge(uint(id)); err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		if errors.Is(err, service.ErrLibraryNotDeleted) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// AdminUploadLibraryFile 上传文件到条目
+func (h *Handlers) AdminUploadLibraryFile(c *gin.Context) {
+	docID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	claims := middleware.CurrentUser(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+
+	maxBytes, err := h.Setting.AttachmentMaxBytes()
+	if err != nil || maxBytes < 1 {
+		maxBytes = service.FileMaxBytes
+	}
+	overhead := int64(64 << 10) // multipart 边界开销
+	limit := maxBytes + overhead
+	if c.Request.ContentLength > limit {
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "文件过大"})
+		return
+	}
+	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, limit)
+
+	file, err := c.FormFile("file")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择文件"})
+		return
+	}
+	if file.Size > maxBytes {
+		mb := int(maxBytes >> 20)
+		if mb < 1 {
+			mb = 1
+		}
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "文件不能超过 " + strconv.Itoa(mb) + "MB"})
+		return
+	}
+	src, err := file.Open()
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无法读取文件"})
+		return
+	}
+	defer src.Close()
+
+	f, err := h.LibrarySvc.AddFile(uint(docID), claims.ID, file.Filename, src)
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryExtDenied) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"file": f})
+}
+
+// AdminDeleteLibraryFile 删除条目文件
+func (h *Handlers) AdminDeleteLibraryFile(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("fid"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的文件 ID"})
+		return
+	}
+	if err := h.LibrarySvc.DeleteFile(uint(id)); err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// ---------- 管理端：导出（迁移 / 备份） ----------
+
+// writeLibraryExport 装载完成后统一以附件形式流式下发 ZIP；
+// 注：一旦开始写响应体，中途 IO 错误无法再改成 JSON 错误，只能记录在 c.Errors。
+func (h *Handlers) writeLibraryExport(c *gin.Context, exp *service.LibraryExport) {
+	c.Header("Content-Type", "application/zip")
+	c.Header("Content-Disposition", "attachment; filename*=UTF-8''"+url.PathEscape(exp.Filename))
+	c.Header("X-Content-Type-Options", "nosniff")
+	c.Status(http.StatusOK)
+	if err := exp.WriteZip(c.Writer); err != nil {
+		_ = c.Error(err)
+	}
+}
+
+// AdminExportLibraryDoc 导出单本书（元信息 + 章节 + 附件 + 本地封面，ZIP）
+func (h *Handlers) AdminExportLibraryDoc(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	exp, err := h.LibrarySvc.BuildBookExport(uint(id))
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "导出失败"})
+		return
+	}
+	h.writeLibraryExport(c, exp)
+}
+
+// AdminExportAllLibrary 导出全部在用书籍（单 ZIP，library.json 索引）
+func (h *Handlers) AdminExportAllLibrary(c *gin.Context) {
+	exp, err := h.LibrarySvc.BuildAllExport()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "导出失败"})
+		return
+	}
+	h.writeLibraryExport(c, exp)
+}
+
+// AdminImportLibrary 上传导出 ZIP 恢复书籍（mode=create 默认跳过冲突 / overwrite 覆盖同名）
+func (h *Handlers) AdminImportLibrary(c *gin.Context) {
+	claims := middleware.CurrentUser(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+
+	const overhead = 64 << 10 // multipart 边界开销
+	limit := int64(service.LibraryImportMaxBytes) + overhead
+	if c.Request.ContentLength > limit {
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "导入包过大"})
+		return
+	}
+	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, limit)
+
+	fh, err := c.FormFile("file")
+	if err != nil {
+		var maxErr *http.MaxBytesError
+		if errors.As(err, &maxErr) {
+			c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "导入包过大（不能超过 512MB）"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择书库导出的 ZIP 备份包"})
+		return
+	}
+	if fh.Size > service.LibraryImportMaxBytes {
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "导入包不能超过 512MB"})
+		return
+	}
+
+	mode := c.PostForm("mode")
+	if mode == "" {
+		mode = service.LibraryImportModeCreate
+	}
+
+	tmpPath, err := saveMultipartToTemp(fh, "library-import-*.zip")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "读取导入包失败"})
+		return
+	}
+	defer os.Remove(tmpPath)
+
+	rep, err := h.LibrarySvc.ImportLibraryZip(tmpPath, mode, claims.ID)
+	if err != nil {
+		switch {
+		case errors.Is(err, service.ErrLibraryImportBadZip),
+			errors.Is(err, service.ErrLibraryImportFormat),
+			errors.Is(err, service.ErrLibraryImportVer),
+			errors.Is(err, service.ErrLibraryImportEmpty),
+			errors.Is(err, service.ErrLibraryImportMode):
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		default:
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "导入失败：" + err.Error()})
+		}
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"report": rep})
+}
+
+// ---------- 管理端：章节 ----------
+
+// AdminCreateLibrarySection 新建章节（parent_id 空=章，非空=节）
+func (h *Handlers) AdminCreateLibrarySection(c *gin.Context) {
+	docID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	var in service.SectionInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	sec, err := h.LibrarySvc.CreateSection(uint(docID), &in)
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"section": sec})
+}
+
+// AdminUpdateLibrarySection 编辑章节标题与正文
+func (h *Handlers) AdminUpdateLibrarySection(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("sid"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的章节 ID"})
+		return
+	}
+	var in service.SectionInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	sec, err := h.LibrarySvc.UpdateSection(uint(id), &in)
+	if err != nil {
+		if errors.Is(err, service.ErrSectionNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "章节不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"section": sec})
+}
+
+// AdminDeleteLibrarySection 删除章节（章级联删除其下小节）
+func (h *Handlers) AdminDeleteLibrarySection(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("sid"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的章节 ID"})
+		return
+	}
+	if err := h.LibrarySvc.DeleteSection(uint(id)); err != nil {
+		if errors.Is(err, service.ErrSectionNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "章节不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// AdminMoveLibrarySection 章节上移/下移（同父兄弟间交换顺序）
+func (h *Handlers) AdminMoveLibrarySection(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("sid"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的章节 ID"})
+		return
+	}
+	var in struct {
+		Direction string `json:"direction"`
+	}
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	if err := h.LibrarySvc.MoveSection(uint(id), in.Direction); err != nil {
+		if errors.Is(err, service.ErrSectionNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "章节不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}
+
+// AdminImportLibraryMarkdown 导入 md 并按标题拆章
+func (h *Handlers) AdminImportLibraryMarkdown(c *gin.Context) {
+	docID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	var in struct {
+		Filename   string `json:"filename"`
+		Content    string `json:"content"`
+		SplitLevel string `json:"split_level"`
+	}
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	sections, err := h.LibrarySvc.ImportMarkdown(uint(docID), in.Filename, in.Content, in.SplitLevel)
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"created": len(sections), "sections": nonNilSlice(sections)})
+}
+
+// AdminImportLibraryMarkdownBatch 批量导入 md：多个文件按传入顺序依次拆章
+func (h *Handlers) AdminImportLibraryMarkdownBatch(c *gin.Context) {
+	docID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的条目 ID"})
+		return
+	}
+	var in struct {
+		Files      []service.ImportFileInput `json:"files"`
+		SplitLevel string                    `json:"split_level"`
+	}
+	if err := c.ShouldBindJSON(&in); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	sections, err := h.LibrarySvc.ImportMarkdownBatch(uint(docID), in.Files, in.SplitLevel)
+	if err != nil {
+		if errors.Is(err, service.ErrLibraryNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "条目不存在"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"created": len(sections), "sections": nonNilSlice(sections)})
+}

backend/handler/notification.go

@@ -5,9 +5,18 @@ import (
 	"strconv"
 
 	"github.com/freefire/jiang13-bbs/middleware"
+	"github.com/freefire/jiang13-bbs/model"
 	"github.com/gin-gonic/gin"
 )
 
+// notificationView 通知列表项：附带关联评论的楼层相对锚点，
+// 供前端拼 #comment-{floor}（主楼）或 #comment-{floor}-r{comment_id}（楼中楼）。
+type notificationView struct {
+	*model.Notification
+	CommentFloor  uint `json:"comment_floor"`
+	CommentIsRoot bool `json:"comment_is_root"`
+}
+
 // Notifications 获取当前用户的通知列表（分页）
 func (h *Handlers) Notifications(c *gin.Context) {
 	claims := middleware.CurrentUser(c)
@@ -19,8 +28,24 @@ func (h *Handlers) Notifications(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
+	commentIDs := make([]uint, 0, len(list))
+	for _, n := range list {
+		if n.CommentID > 0 {
+			commentIDs = append(commentIDs, n.CommentID)
+		}
+	}
+	anchors := h.Comment.AnchorsByCommentIDs(commentIDs)
+	views := make([]notificationView, 0, len(list))
+	for i := range list {
+		v := notificationView{Notification: &list[i]}
+		if a, ok := anchors[list[i].CommentID]; ok {
+			v.CommentFloor = a.Floor
+			v.CommentIsRoot = a.IsRoot
+		}
+		views = append(views, v)
+	}
 	c.JSON(http.StatusOK, gin.H{
-		"notifications": nonNilSlice(list),
+		"notifications": nonNilSlice(views),
 		"total":         total,
 		"page":          page,
 		"size":          size,

backend/handler/operations.go

@@ -313,7 +313,8 @@ func (h *Handlers) PublicObject(c *gin.Context) {
 	defer r.Close()
 	c.Header("Content-Type", m)
 	c.Header("X-Content-Type-Options", "nosniff")
-	c.Header("Cache-Control", "private, no-store")
+	// 对象 ID 按上传随机生成不覆盖，直出内容可短缓存（302 预签名分支不缓存，防过期地址复用）
+	c.Header("Cache-Control", "public, max-age=86400")
 	c.Status(200)
 	_, _ = io.Copy(c.Writer, r)
 }

backend/handler/overview.go

@@ -29,20 +29,20 @@ func (h *Handlers) Overview(c *gin.Context) {
 		}
 	}
 	c.JSON(http.StatusOK, gin.H{
-		"stats":               data.Stats,
-		"hot":                 data.Hot,
-		"active_users":        data.ActiveUsers,
-		"boards":              data.Boards,
-		"announcements":       data.Announcements,
-		"announcements_total": data.AnnouncementsTotal,
-		"sidebar_pages":       data.SidebarPages,
-		"new_users":           data.NewUsers,
-		"checkin":             data.Checkin,
-		"ads":                 data.Ads,
-		"ads_panel_title":     data.AdsPanelTitle,
-		"ads_enabled":         data.AdsEnabled,
-		"sponsors":            data.Sponsors,
+		"stats":                data.Stats,
+		"hot":                  data.Hot,
+		"active_users":         data.ActiveUsers,
+		"boards":               data.Boards,
+		"announcements":        data.Announcements,
+		"announcements_total":  data.AnnouncementsTotal,
+		"sidebar_pages":        data.SidebarPages,
+		"new_users":            data.NewUsers,
+		"checkin":              data.Checkin,
+		"ads":                  data.Ads,
+		"ads_panel_title":      data.AdsPanelTitle,
+		"ads_enabled":          data.AdsEnabled,
+		"sponsors":             data.Sponsors,
 		"sponsors_panel_title": data.SponsorsPanelTitle,
-		"sponsors_enabled":    data.SponsorsEnabled,
+		"sponsors_enabled":     data.SponsorsEnabled,
 	})
 }

backend/handler/post.go

@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"path/filepath"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/freefire/jiang13-bbs/middleware"
@@ -16,13 +17,20 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+// maxSearchKeywordRunes 帖子搜索关键词长度上限（字符数，与前端搜索框 maxLength 一致）
+const maxSearchKeywordRunes = 100
+
 // Posts 获取帖子列表
 func (h *Handlers) Posts(c *gin.Context) {
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
 	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
 	boardID, _ := strconv.ParseUint(c.Query("board_id"), 10, 64)
 	sort := c.DefaultQuery("sort", "latest")
-	keyword := c.Query("keyword")
+	keyword := strings.TrimSpace(c.Query("keyword"))
+	// 搜索词上限：前端输入框同限；超长词 ILIKE 必然无意义结果，静默截断
+	if runes := []rune(keyword); len(runes) > maxSearchKeywordRunes {
+		keyword = string(runes[:maxSearchKeywordRunes])
+	}
 	recommended := c.Query("recommended") == "true"
 
 	var viewerID uint

backend/handler/setting.go

@@ -73,10 +73,14 @@ type updateSettingsRequest struct {
 	NecroReplyAfterHours *int `json:"necro_reply_after_hours"`
 	NecroReplyPenalty    *int `json:"necro_reply_penalty"`
 
-	Levels *[]model.LevelDef `json:"levels"`
-	LevelsFx *bool           `json:"levels_fx"`
+	Levels   *[]model.LevelDef `json:"levels"`
+	LevelsFx *bool             `json:"levels_fx"`
 
 	UrlStyle *string `json:"url_style"`
+
+	MobileTabs *[]string `json:"mobile_tabs"`
+
+	HeaderNav *[]service.HeaderNavItem `json:"header_nav"`
 }
 
 func settingsPayload(saved service.PublicSiteSettings) gin.H {
@@ -87,9 +91,9 @@ func settingsPayload(saved service.PublicSiteSettings) gin.H {
 		"site_name":              saved.SiteName,
 		"site_description":       saved.SiteDescription,
 		"allow_register":         saved.AllowRegister,
-		"allow_comments":          saved.AllowComments,
-		"comments_require_login":  saved.CommentsRequireLogin,
-		"allow_messages":          saved.AllowMessages,
+		"allow_comments":         saved.AllowComments,
+		"comments_require_login": saved.CommentsRequireLogin,
+		"allow_messages":         saved.AllowMessages,
 		"post_cooldown_hours":    saved.PostCooldownHours,
 		"code_block_auto_fold":   saved.CodeBlockAutoFold,
 		"code_block_fold_lines":  saved.CodeBlockFoldLines,
@@ -127,15 +131,19 @@ func settingsPayload(saved service.PublicSiteSettings) gin.H {
 		"points_reply_daily_cap":   saved.PointsReplyDailyCap,
 		"points_recommend_reward":  saved.PointsRecommendReward,
 
-		"post_edit_lock_hours":     saved.PostEditLockHours,
-		"comment_edit_lock_hours":  saved.CommentEditLockHours,
-		"necro_reply_after_hours":  saved.NecroReplyAfterHours,
-		"necro_reply_penalty":      saved.NecroReplyPenalty,
+		"post_edit_lock_hours":    saved.PostEditLockHours,
+		"comment_edit_lock_hours": saved.CommentEditLockHours,
+		"necro_reply_after_hours": saved.NecroReplyAfterHours,
+		"necro_reply_penalty":     saved.NecroReplyPenalty,
 
-		"levels": saved.Levels,
+		"levels":    saved.Levels,
 		"levels_fx": saved.LevelsFx,
 
 		"url_style": saved.UrlStyle,
+
+		"mobile_tabs": saved.MobileTabs,
+
+		"header_nav": saved.HeaderNav,
 	}
 }
 
@@ -159,7 +167,7 @@ func (req *updateSettingsRequest) hasAny() bool {
 		req.PointsRecommendReward != nil || req.Levels != nil || req.LevelsFx != nil ||
 		req.PostEditLockHours != nil || req.CommentEditLockHours != nil ||
 		req.NecroReplyAfterHours != nil || req.NecroReplyPenalty != nil ||
-		req.UrlStyle != nil
+		req.UrlStyle != nil || req.MobileTabs != nil || req.HeaderNav != nil
 }
 
 // AdminGetSettings 超管读取站点设置（与公开 payload 字段一致）
@@ -552,6 +560,26 @@ func (h *Handlers) UpdateSettings(c *gin.Context) {
 			return
 		}
 	}
+	if req.MobileTabs != nil {
+		if err := h.Setting.SetMobileTabs(*req.MobileTabs); err != nil {
+			if errors.Is(err, service.ErrInvalidSiteSetting) {
+				c.JSON(http.StatusBadRequest, gin.H{"error": "移动端底栏配置无效（至少保留一项，且取值须在允许列表内）"})
+				return
+			}
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
+			return
+		}
+	}
+	if req.HeaderNav != nil {
+		if err := h.Setting.SetHeaderNav(*req.HeaderNav); err != nil {
+			if errors.Is(err, service.ErrInvalidSiteSetting) {
+				c.JSON(http.StatusBadRequest, gin.H{"error": "顶部导航配置无效（最多 8 项，内置项须在允许列表内，自定义项名称 1–16 字、地址须为站内路径或 http(s)）"})
+				return
+			}
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
+			return
+		}
+	}
 
 	saved, err := h.Setting.Public()
 	if err != nil {

backend/handler/site_page.go

@@ -101,3 +101,25 @@ func (h *Handlers) AdminDeleteSitePage(c *gin.Context) {
 	}
 	c.JSON(http.StatusOK, gin.H{"ok": true})
 }
+
+// AdminPurgeSitePage 彻底删除单页（仅限已软删）
+func (h *Handlers) AdminPurgeSitePage(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的页面 ID"})
+		return
+	}
+	if err := h.SitePage.Purge(uint(id)); err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "页面不存在"})
+			return
+		}
+		if errors.Is(err, service.ErrSitePageNotDeleted) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true})
+}

backend/handler/timeline.go

@@ -27,3 +27,20 @@ func (h *Handlers) TimelineFromGit(c *gin.Context) {
 	}
 	c.JSON(http.StatusOK, result)
 }
+
+// TimelineFromReleases 从 Git releases 页 URL 导入时间线条目（登录 + CSRF + 限流）
+func (h *Handlers) TimelineFromReleases(c *gin.Context) {
+	var req struct {
+		URLs []string `json:"urls"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
+		return
+	}
+	result, err := h.Setting.ImportTimelineFromReleases(req.URLs)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, result)
+}

backend/handler/upload.go

@@ -3,10 +3,14 @@ package handler
 import (
 	"errors"
 	"io"
+	"mime"
 	"net/http"
+	"path"
 	"strconv"
+	"time"
 
 	"github.com/freefire/jiang13-bbs/middleware"
+	"github.com/freefire/jiang13-bbs/model"
 	"github.com/freefire/jiang13-bbs/service"
 	"github.com/gin-gonic/gin"
 )
@@ -99,7 +103,7 @@ func (h *Handlers) UploadImage(c *gin.Context) {
 	}
 	defer f.Close()
 
-	att, err := h.Upload.SaveImage(claims.ID, f)
+	att, err := h.Upload.SaveImage(claims.ID, f, c.PostForm("source"))
 	if err != nil {
 		var maxErr *http.MaxBytesError
 		if errors.As(err, &maxErr) {
@@ -311,6 +315,84 @@ func (h *Handlers) UploadBrandFromMedia(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"url": url})
 }
 
+// UploadLibraryCoverFromMedia 把本人媒体库图片用作书籍封面素材。
+// 若该图已是封面类型（source=library_cover），直接复用原记录，不再复制；
+// 否则复制一份并标记为封面类型（与原图解耦，删除原图不影响封面）。
+func (h *Handlers) UploadLibraryCoverFromMedia(c *gin.Context) {
+	var req struct {
+		AttachmentID uint `json:"attachment_id"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil || req.AttachmentID == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择媒体库中的图片"})
+		return
+	}
+	claims := middleware.CurrentUser(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+
+	// 已是封面类型的图直接复用，避免重复复制产生冗余记录
+	if existing, err := h.Upload.FindMediaBySource(claims.ID, req.AttachmentID, model.AttachmentSourceLibraryCover); err == nil {
+		c.JSON(http.StatusOK, gin.H{"url": existing.URL, "attachment": existing})
+		return
+	}
+
+	att, err := h.Upload.CopyImageFromMedia(claims.ID, req.AttachmentID, model.AttachmentSourceLibraryCover)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"url": att.URL, "attachment": att})
+}
+
+// brandAliasSlots 固定地址路径段 → 品牌槽位
+var brandAliasSlots = map[string]string{
+	"logo-light": service.BrandSlotLight,
+	"logo-dark":  service.BrandSlotDark,
+	"favicon":    service.BrandSlotFavicon,
+}
+
+// BrandImage 品牌图固定对外地址（GET /api/brand/logo-light|logo-dark|favicon）：
+// 友链等外部引用此地址，站点换图后按设置解析到当前图，地址永不变。
+func (h *Handlers) BrandImage(c *gin.Context) {
+	slot, ok := brandAliasSlots[c.Param("slot")]
+	if !ok {
+		c.Status(http.StatusNotFound)
+		return
+	}
+	var url string
+	var err error
+	switch slot {
+	case service.BrandSlotLight:
+		url, err = h.Setting.LogoLightURL()
+	case service.BrandSlotDark:
+		url, err = h.Setting.LogoDarkURL()
+	default:
+		url, err = h.Setting.FaviconURL()
+	}
+	if err != nil {
+		c.Status(http.StatusInternalServerError)
+		return
+	}
+	if url == "" {
+		c.Status(http.StatusNotFound)
+		return
+	}
+	f, err := h.Upload.OpenBrandFile(url)
+	if err != nil {
+		c.Status(http.StatusNotFound)
+		return
+	}
+	defer f.Close()
+	// 扩展名定 Content-Type（SVG 不能靠嗅探）；短缓存让换图在友链侧尽快生效
+	if ct := mime.TypeByExtension(path.Ext(url)); ct != "" {
+		c.Header("Content-Type", ct)
+	}
+	c.Header("Cache-Control", "public, max-age=3600")
+	http.ServeContent(c.Writer, c.Request, path.Base(url), time.Time{}, f)
+}
+
 // AdminMediaLibrary 管理后台媒体库：全站图片盘点（磁盘五类目录 + 附件元数据）
 func (h *Handlers) AdminMediaLibrary(c *gin.Context) {
 	items, counts, err := h.Upload.AdminMediaLibrary()
@@ -332,6 +414,23 @@ func (h *Handlers) MediaLibraryThumb(c *gin.Context) {
 	c.Data(http.StatusOK, "image/webp", data)
 }
 
+// ImageVariant 公开图片变体（GET /api/img?u=<源图URL>&w=<白名单宽度>）：
+// 供全站 srcset 消费，源内容不可变 → immutable 长缓存；失败 404 由前端 onError 兜底
+func (h *Handlers) ImageVariant(c *gin.Context) {
+	w, err := strconv.Atoi(c.Query("w"))
+	if err != nil || !service.IsVariantWidth(w) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "不支持的尺寸"})
+		return
+	}
+	data, m, err := h.Upload.Variant(c.Query("u"), w)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "图片不可用"})
+		return
+	}
+	c.Header("Cache-Control", "public, max-age=31536000, immutable")
+	c.Data(http.StatusOK, m, data)
+}
+
 func brandTooLarge(slot string) string {
 	if slot == service.BrandSlotFavicon {
 		return "Favicon 不能超过 512KB"

backend/handler/user.go

@@ -130,9 +130,9 @@ func (h *Handlers) UserProfile(c *gin.Context) {
 	}
 	// 访客与该用户的关注关系（关注按钮初始态）
 	userPayload["is_following"] = isFollowing
-	// 邮箱仅本人可见，打码展示（j***@163.com）
+	// 邮箱仅本人可见；仅本人访问时下发明文（用于账号信息展示与资料表单回填）
 	if viewerID == user.ID && user.Email != "" {
-		userPayload["email"] = maskEmail(user.Email)
+		userPayload["email"] = user.Email
 	}
 	// 徽章墙（失败不阻塞资料返回）
 	if h.Badge != nil {
@@ -144,11 +144,11 @@ func (h *Handlers) UserProfile(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{
 		"user": userPayload,
 		"stats": gin.H{
-			"post_count":     postCount,
-			"comment_count":  commentCount,
-			"points":         pointsTotal,
-			"streak":         streak,
-			"favorite_count": favoriteCount,
+			"post_count":      postCount,
+			"comment_count":   commentCount,
+			"points":          pointsTotal,
+			"streak":          streak,
+			"favorite_count":  favoriteCount,
 			"following_count": followingCount,
 		},
 		"posts":       nonNilSlice(posts),
@@ -158,21 +158,6 @@ func (h *Handlers) UserProfile(c *gin.Context) {
 	})
 }
 
-// maskEmail 邮箱打码：保留首字符与 @ 后域名（j***@163.com）
-func maskEmail(email string) string {
-	at := -1
-	for i, r := range email {
-		if r == '@' {
-			at = i
-			break
-		}
-	}
-	if at <= 0 {
-		return "***"
-	}
-	return email[:1] + "***" + email[at:]
-}
-
 // UserComments 获取用户发表的评论列表（分页，含帖子标题）
 func (h *Handlers) UserComments(c *gin.Context) {
 	id, err := strconv.ParseUint(c.Param("id"), 10, 64)

backend/middleware/auth.go

@@ -85,7 +85,32 @@ func (m *AuthMiddleware) RequireStaff() gin.HandlerFunc {
 	}
 }
 
-// RequirePerm 功能点鉴权，必须接在 RequireStaff 之后
+// RequireActor 必须登录并加载实时 Actor（不要求管理角色），
+// 供账号级渠道权限（非管理角色也可被单独授予）所在路由组使用；
+// 功能点鉴权由后续 RequirePerm 完成
+func (m *AuthMiddleware) RequireActor() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		claims, ok := m.parseToken(c)
+		if !ok {
+			if c.GetBool(AccountBannedKey) {
+				bannedJSON(c)
+				return
+			}
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
+			return
+		}
+		actor, err := m.auth.LoadActor(claims.ID)
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "无权限执行该操作"})
+			return
+		}
+		c.Set("user", claims)
+		c.Set(ActorKey, actor)
+		c.Next()
+	}
+}
+
+// RequirePerm 功能点鉴权，必须接在 RequireStaff / RequireActor 之后
 func (m *AuthMiddleware) RequirePerm(perm string) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		actor := CurrentActor(c)

backend/middleware/upload_cache.go

@@ -0,0 +1,19 @@
+package middleware
+
+import (
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// UploadStaticCache 上传文件长缓存：/uploads 下文件名均为上传时随机生成、
+// 写入后不覆盖（SaveAvatar/SaveImage 等均新建文件），URL 内容恒定，可安全
+// immutable。PageSpeed「缓存生命周期」修复项。
+func UploadStaticCache() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if strings.HasPrefix(c.Request.URL.Path, "/uploads/") {
+			c.Header("Cache-Control", "public, max-age=31536000, immutable")
+		}
+		c.Next()
+	}
+}

backend/model/ad.go

@@ -19,26 +19,26 @@ const (
 
 // Ad 赞助广告（游客可申购，管理员审核后展示于首页侧栏）
 type Ad struct {
-	ID            uint           `gorm:"primaryKey" json:"id"`
-	Kind          string         `gorm:"size:16;not null;index" json:"kind"`     // image | text
-	Status        string         `gorm:"size:16;not null;index" json:"status"`   // pending/active/rejected/expired
-	ContactEmail  string         `gorm:"size:128;not null" json:"contact_email"`
-	LinkURL       string         `gorm:"size:512;not null" json:"link_url"`
-	ImageURL      string         `gorm:"size:512" json:"image_url"` // 图片广告
-	Title         string         `gorm:"size:64" json:"title"`      // 文字广告
-	TextColor     string         `gorm:"size:16" json:"text_color"`
-	BgColor       string         `gorm:"size:16" json:"bg_color"`
-	DurationDays  int            `gorm:"not null" json:"duration_days"`
-	PaymentID     string         `gorm:"size:64;not null" json:"payment_id"`
-	BuyerNote     string         `gorm:"size:200" json:"buyer_note"`
-	StartsAt      *time.Time     `json:"starts_at"`
-	EndsAt        *time.Time     `json:"ends_at"`
-	RejectReason  string         `gorm:"size:200" json:"reject_reason"`
-	SortOrder     int            `gorm:"not null;default:0" json:"sort_order"`
-	SubmitIP      string         `gorm:"size:45" json:"-"`
-	ReviewedAt    *time.Time     `json:"reviewed_at"`
-	ReviewedBy    *uint          `json:"reviewed_by"`
-	CreatedAt     time.Time      `json:"created_at"`
-	UpdatedAt     time.Time      `json:"updated_at"`
-	DeletedAt     gorm.DeletedAt `gorm:"index" json:"-"`
+	ID           uint           `gorm:"primaryKey" json:"id"`
+	Kind         string         `gorm:"size:16;not null;index" json:"kind"`   // image | text
+	Status       string         `gorm:"size:16;not null;index" json:"status"` // pending/active/rejected/expired
+	ContactEmail string         `gorm:"size:128;not null" json:"contact_email"`
+	LinkURL      string         `gorm:"size:512;not null" json:"link_url"`
+	ImageURL     string         `gorm:"size:512" json:"image_url"` // 图片广告
+	Title        string         `gorm:"size:64" json:"title"`      // 文字广告
+	TextColor    string         `gorm:"size:16" json:"text_color"`
+	BgColor      string         `gorm:"size:16" json:"bg_color"`
+	DurationDays int            `gorm:"not null" json:"duration_days"`
+	PaymentID    string         `gorm:"size:64;not null" json:"payment_id"`
+	BuyerNote    string         `gorm:"size:200" json:"buyer_note"`
+	StartsAt     *time.Time     `json:"starts_at"`
+	EndsAt       *time.Time     `json:"ends_at"`
+	RejectReason string         `gorm:"size:200" json:"reject_reason"`
+	SortOrder    int            `gorm:"not null;default:0" json:"sort_order"`
+	SubmitIP     string         `gorm:"size:45" json:"-"`
+	ReviewedAt   *time.Time     `json:"reviewed_at"`
+	ReviewedBy   *uint          `json:"reviewed_by"`
+	CreatedAt    time.Time      `json:"created_at"`
+	UpdatedAt    time.Time      `json:"updated_at"`
+	DeletedAt    gorm.DeletedAt `gorm:"index" json:"-"`
 }

backend/model/db.go

@@ -62,8 +62,8 @@ func InitDB(dsn string) error {
 		&ChatRoom{}, &ChatRoomMember{}, &ChatMessage{},
 		&PointLedger{}, &PostContentUnlock{}, &PostAttachment{}, &PostAttachmentUnlock{},
 		&Badge{}, &UserBadge{},
-		&PostPollVote{}, &PostLotteryEntry{}, &Ad{}, &SidebarWidget{},
-		&ImportRecord{},
+		&PostPollVote{}, &PostLotteryEntry{}, &Ad{}, &SidebarWidget{}, &FriendLink{},
+		&ImportRecord{}, &LibraryDoc{}, &LibraryFile{}, &LibrarySection{},
 	); err != nil {
 		return fmt.Errorf("自动迁移失败: %w", err)
 	}
@@ -78,6 +78,9 @@ func InitDB(dsn string) error {
 	// 每次启动执行，幂等自愈，保证与 CreditTx 增量口径一致（均排除 bounty_refund）
 	backfillUserTotalPoints(db)
 
+	// 书库：历史条目 creator_id=0 时介绍页无创建者可展示，回填为站长
+	backfillLibraryCreator(db)
+
 	// login_logs.success 早期 default=true 与 GORM 零值省略叠加，
 	// 会把失败登录错存为成功；AutoMigrate 不会改列默认值，这里幂等修正
 	if err := db.Exec(`ALTER TABLE login_logs ALTER COLUMN success SET DEFAULT false`).Error; err != nil {
@@ -146,6 +149,7 @@ func dropStaleChatFKConstraints(db *gorm.DB) error {
 	pairs := []struct{ table, constraint string }{
 		{"chat_rooms", "fk_chat_rooms_last_message"},
 		{"notifications", "fk_notifications_room"},
+		{"chat_messages", "fk_chat_messages_sender"},
 	}
 	for _, p := range pairs {
 		db.Exec(fmt.Sprintf(`ALTER TABLE IF EXISTS %s DROP CONSTRAINT IF EXISTS %s`, p.table, p.constraint))
@@ -368,6 +372,29 @@ func backfillUserTotalPoints(db *gorm.DB) {
 	}
 }
 
+// backfillLibraryCreator 为历史书库条目（creator_id=0，特性上线前创建或早期导入）
+// 回填站长为创建者，保证介绍页「创建者」可展示。幂等：仅影响 creator_id=0 的行；
+// 站长不存在（空库）时跳过，等下次启动自愈。
+func backfillLibraryCreator(db *gorm.DB) {
+	var owner User
+	err := db.Select("id").Where("role = ?", RoleOwner).Order("id ASC").First(&owner).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return
+	}
+	if err != nil {
+		log.Printf("[model] 回填书库创建者前置查询失败: %v", err)
+		return
+	}
+	res := db.Exec(`UPDATE library_docs SET creator_id = ? WHERE creator_id = 0`, owner.ID)
+	if res.Error != nil {
+		log.Printf("[model] 回填书库创建者失败: %v", res.Error)
+		return
+	}
+	if res.RowsAffected > 0 {
+		log.Printf("[model] 已回填书库条目创建者为站长 %d 行", res.RowsAffected)
+	}
+}
+
 // backfillBoardDefaults 为升级前已存在的板块补齐新字段默认值。
 // 以 post_policy 为空作为「迁移前旧行」的判定标志：仅对这些行一次性回填
 // post_policy=all、visible=true；后续已被显式设置过的行（含站长隐藏的板块）不会被覆盖。

backend/model/models.go

@@ -122,6 +122,7 @@ type User struct {
 	Role              Role           `gorm:"size:16;default:user" json:"role"`
 	Banned            bool           `gorm:"default:false" json:"banned"`
 	CanManageMessages bool           `gorm:"not null;default:false" json:"can_manage_messages"` // 站点消息管理（仅站长可授；站长/超管固有全站监管）
+	PermOverrides     string         `gorm:"size:256;default:''" json:"-"`                      // 账号级渠道权限覆盖 JSON；仅后台权限服务读取，序列化跳过
 	Points            int            `gorm:"not null;default:0" json:"points"`                  // 可用积分余额
 	TotalPoints       int            `gorm:"not null;default:0" json:"total_points"`            // 累计获得积分（经验值，定级依据；消费不减）
 	Level             int            `gorm:"-" json:"level"`                                    // 用户等级（AfterFind 由 TotalPoints 计算，纯展示不入库）
@@ -323,9 +324,9 @@ const (
 	PointReasonBountyEscrow   = "bounty_escrow"
 	PointReasonBountyRefund   = "bounty_refund"
 	PointReasonBountyAward    = "bounty_award"
-	PointReasonPostReward     = "post_reward"  // 发帖奖励（可配置，0=关闭）
-	PointReasonReplyReward    = "reply_reward" // 回复奖励（可配置，0=关闭）
-	PointReasonStreakBonus    = "streak_bonus" // 连续签到里程碑加成
+	PointReasonPostReward     = "post_reward"      // 发帖奖励（可配置，0=关闭）
+	PointReasonReplyReward    = "reply_reward"     // 回复奖励（可配置，0=关闭）
+	PointReasonStreakBonus    = "streak_bonus"     // 连续签到里程碑加成
 	PointReasonRecommend      = "recommend_reward" // 帖子被推荐奖励（可配置，0=关闭，每帖仅一次）
 	PointReasonAdminAdjust    = "admin_adjust"     // 管理员手动调整（加分计累计可升级；扣分仅扣余额）
 	PointReasonNecroReply     = "necro_reply"      // 旧帖回复扣分（可配置，0=关闭）
@@ -486,7 +487,7 @@ type Notification struct {
 	IsRead    bool      `gorm:"default:false;index" json:"is_read"`
 	CreatedAt time.Time `json:"created_at"`
 
-	Actor User      `gorm:"foreignKey:ActorID" json:"actor,omitempty"`
+	Actor User `gorm:"foreignKey:ActorID" json:"actor,omitempty"`
 	// PostID 允许为 0（mention/badge 等无关联帖子），禁建 FK 约束，否则 post_id=0 插入违反外键
 	Post Post      `gorm:"foreignKey:PostID;constraint:-" json:"post,omitempty"`
 	Room *ChatRoom `gorm:"foreignKey:RoomID;constraint:-" json:"room,omitempty"`
@@ -522,6 +523,58 @@ type SitePage struct {
 	DeletedAt     gorm.DeletedAt `gorm:"index" json:"-"`
 }
 
+// LibraryDoc 书库条目（书籍/文档/纯 HTML 页展示；文件独立目录存储，仅经 API 消费）
+type LibraryDoc struct {
+	ID          uint   `gorm:"primaryKey" json:"id"`
+	Slug        string `gorm:"size:64;uniqueIndex;not null" json:"slug"`
+	Title       string `gorm:"size:200;not null" json:"title"`
+	Description string `gorm:"type:text" json:"description"`           // markdown 介绍，可空
+	CoverURL    string `gorm:"size:512" json:"cover_url"`              // 可选图片封面（/uploads/images）
+	CoverWidth  int    `gorm:"not null;default:0" json:"cover_width"`  // 封面自然宽（0=未知，前端回退探测）
+	CoverHeight int    `gorm:"not null;default:0" json:"cover_height"` // 封面自然高（0=未知，前端回退探测）
+	Published   bool   `gorm:"not null;index" json:"published"`
+	SortOrder   int    `gorm:"not null;default:0" json:"sort_order"`
+	// EntriesAuto 全章节条目卡模式：开启后章节内容免写 [entries] 壳，
+	// 「## 标题 + @tags/@summary/字段::值/@source 指令行」自动识别为条目卡（个别章节用 [entries:off] 例外）
+	EntriesAuto bool `gorm:"not null;default:false" json:"entries_auto"`
+	// Author 书籍作者（自由文本，可填多位，如「鲁迅 译 / 某某注」），仅展示用
+	Author string `gorm:"size:100;not null;default:''" json:"author"`
+	// CreatorID 条目创建者（站点用户；0=历史数据或导入时无对应用户），创建后不变
+	CreatorID uint           `gorm:"index;not null;default:0" json:"creator_id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+// LibraryFile 书库文件（html/pdf/epub 等；存 data/library，不进公开静态目录）
+type LibraryFile struct {
+	ID            uint           `gorm:"primaryKey" json:"id"`
+	DocID         uint           `gorm:"index;not null;default:0" json:"doc_id"`
+	UserID        uint           `gorm:"index;not null" json:"user_id"` // 上传管理员
+	Name          string         `gorm:"size:256;not null" json:"name"` // 原始文件名
+	StoredName    string         `gorm:"size:64;not null" json:"-"`     // 磁盘文件名
+	Ext           string         `gorm:"size:16;not null;default:''" json:"ext"`
+	MIME          string         `gorm:"size:128;not null;default:application/octet-stream" json:"mime"`
+	Size          int            `gorm:"not null;default:0" json:"size"`
+	DownloadCount int            `gorm:"not null;default:0" json:"download_count"`
+	SortOrder     int            `gorm:"not null;default:0" json:"sort_order"`
+	CreatedAt     time.Time      `json:"created_at"`
+	DeletedAt     gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+// LibrarySection 书库章节（两级树：ParentID 空=章，非空=节；正文 markdown）
+type LibrarySection struct {
+	ID        uint           `gorm:"primaryKey" json:"id"`
+	DocID     uint           `gorm:"index;not null;default:0" json:"doc_id"`
+	ParentID  *uint          `gorm:"index" json:"parent_id"` // nil=章；非空=节，父必须是同条目的章
+	Title     string         `gorm:"size:200;not null" json:"title"`
+	Content   string         `gorm:"type:text" json:"content"`
+	SortOrder int            `gorm:"not null;default:0" json:"sort_order"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
 // SiteSetting 站点级键值设置（如历史在线峰值 peak_online）
 type SiteSetting struct {
 	Key       string    `gorm:"primaryKey;size:64" json:"key"`
@@ -542,6 +595,24 @@ type SidebarWidget struct {
 	UpdatedAt time.Time `json:"updated_at"`
 }
 
+// FriendLink 友情链接；申请审批制，status=pending 经管理员 approve 后前台可见
+type FriendLink struct {
+	ID              uint           `gorm:"primarykey" json:"id"`
+	Name            string         `gorm:"size:64;not null" json:"name"`
+	URL             string         `gorm:"size:512;not null" json:"url"`
+	Description     string         `gorm:"size:255" json:"description"`
+	LogoURL         string         `gorm:"size:512" json:"logo_url"`
+	Category        string         `gorm:"size:32;index" json:"category"`
+	ReciprocalURL   string         `gorm:"size:512" json:"reciprocal_url"` // 申请人填写的回链地址，供站长核对
+	SortOrder       int            `gorm:"not null;default:0;index" json:"sort_order"`
+	Status          string         `gorm:"size:16;not null;default:'pending';index" json:"status"` // pending|approved|rejected
+	ApplicantUserID *uint          `gorm:"index" json:"applicant_user_id,omitempty"`               // 后台直接新建时为 nil
+	RejectReason    string         `gorm:"size:255" json:"reject_reason,omitempty"`
+	CreatedAt       time.Time      `json:"created_at"`
+	UpdatedAt       time.Time      `json:"updated_at"`
+	DeletedAt       gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
 // SiteDailyStats 站点日维度访问量（轻量 PV/UV）
 type SiteDailyStats struct {
 	Date       time.Time `gorm:"type:date;primaryKey" json:"date"`
@@ -588,11 +659,19 @@ const (
 	AttachmentKindImage  = "image"  // 通用图片（帖子插图等，媒体库统一管理）
 )
 
+// 附件来源（Source）：媒体库分组依据，决定"从图库选图"时是否可直接复用
+const (
+	AttachmentSourcePost           = "post"            // 帖子/文章编辑器插图（默认）
+	AttachmentSourceLibraryCover   = "library_cover"   // 书库封面（选用时已复制过，再次选可直接引用）
+	AttachmentSourceLibraryContent = "library_content" // 书库正文内容插图
+)
+
 // Attachment 用户上传的附件（当前仅头像，全部为 WebP）
 type Attachment struct {
 	ID        uint      `gorm:"primaryKey" json:"id"`
 	UserID    uint      `gorm:"index:idx_attachment_user_kind,priority:1;not null" json:"user_id"`
 	Kind      string    `gorm:"size:16;index:idx_attachment_user_kind,priority:2;not null" json:"kind"`
+	Source    string    `gorm:"size:24;not null;default:'post'" json:"source"`
 	URL       string    `gorm:"size:512;not null" json:"url"`
 	MIME      string    `gorm:"size:32;not null;default:image/webp" json:"mime"`
 	Size      int       `gorm:"not null;default:0" json:"size"` // 裁剪后文件字节数（大小限制以此为准）
@@ -672,6 +751,7 @@ type ChatRoomMember struct {
 	Role              string     `gorm:"size:16;not null;default:member" json:"role"`
 	LastReadMessageID uint       `gorm:"not null;default:0" json:"last_read_message_id"`
 	Muted             bool       `gorm:"not null;default:false" json:"muted"` // 被群主禁言
+	MutedUntil        *time.Time `json:"muted_until,omitempty"`               // 禁言截止时间；nil 表示永久
 	PinnedAt          *time.Time `json:"pinned_at,omitempty"`                 // 该用户个人置顶时间；大厅强制置顶不依赖此字段
 	CreatedAt         time.Time  `json:"created_at"`
 	UpdatedAt         time.Time  `json:"updated_at"`
@@ -683,17 +763,18 @@ type ChatRoomMember struct {
 type ChatMessage struct {
 	ID         uint           `gorm:"primaryKey" json:"id"`
 	RoomID     uint           `gorm:"index:idx_chat_room_created,priority:1;not null" json:"room_id"`
-	SenderID   uint           `gorm:"index;not null" json:"sender_id"`
+	SenderID   uint           `gorm:"index" json:"sender_id"` // 0 表示系统消息（is_system=true）
 	Content    string         `gorm:"type:varchar(2000);not null" json:"content"`
 	ReplyToID  uint           `gorm:"not null;default:0;index" json:"reply_to_id"`    // 引用的消息 ID，0 表示无引用
 	ReplySnap  string         `gorm:"size:512;not null;default:''" json:"reply_snap"` // 引用快照「昵称: 摘要」，原文撤回后仍可展示
 	MentionIDs string         `gorm:"size:512;not null;default:''" json:"-"`          // 被@用户 ID 逗号分隔（落通知用）
 	RecalledAt *time.Time     `json:"recalled_at,omitempty"`
 	RecalledBy uint           `gorm:"not null;default:0" json:"recalled_by"`
+	IsSystem   bool           `gorm:"not null;default:false" json:"is_system"` // 系统提示（如禁言通知），sender_id=0
 	CreatedAt  time.Time      `gorm:"index:idx_chat_room_created,priority:2" json:"created_at"`
 	DeletedAt  gorm.DeletedAt `gorm:"index" json:"-"`
 
-	Sender User `gorm:"foreignKey:SenderID" json:"sender,omitempty"`
+	Sender User `gorm:"foreignKey:SenderID;constraint:-" json:"sender,omitempty"` // constraint:- 禁用 FK，支持 sender_id=0 的系统消息
 	// RecalledBy=0 时不建 FK；Preload 仅用于已撤回消息展示撤回者昵称
 	Recaller *User `gorm:"foreignKey:RecalledBy;constraint:-" json:"recaller,omitempty"`
 }

backend/realtime/hub.go

@@ -18,18 +18,19 @@ import (
 
 // 事件类型：前后端共享的单层 JSON 协议契约，禁止手拼 JSON / 双重编码
 const (
-	EventHello           = "hello"            // 建连欢迎帧（含在线用户快照）
-	EventPong            = "pong"             // 应用层心跳应答
-	EventSettingsChanged = "settings:changed" // 站点设置（主题色）变更，全员广播
-	EventPresenceUpdate  = "presence:update"  // 用户上/下线，仅 staff 房间
-	EventChatMessage     = "chat:message"          // 群聊新消息，推 chat:{roomID}
-	EventChatMembership  = "chat:membership"       // 群成员关系变更（被踢/群解散/被邀请），推 user:{id}
-	EventNotificationNew = "notification:new"      // 新站内通知（如群聊 @），推 user:{id}
-	EventFeedChanged     = "feed:changed"          // 帖子流有公开新内容（三期），全员广播
-	EventChatRecalled    = "chat:message_recalled" // 消息撤回，推 chat:{roomID}
-	EventChatUnread      = "chat:unread"           // 未读增量，推 user:{id}（未订阅房间也能实时角标）
-	EventModerationChanged = "moderation:changed"  // 待审队列变化，推 staff 房间（客户端各自 HTTP 校准角标）
-	EventSessionReplaced = "session:replaced"      // 登录态被顶/被剔除，推 user:{id}（旧设备即时感知并提示重新登录）
+	EventHello             = "hello"                 // 建连欢迎帧（含在线用户快照）
+	EventPong              = "pong"                  // 应用层心跳应答
+	EventSettingsChanged   = "settings:changed"      // 站点设置（主题色）变更，全员广播
+	EventPresenceUpdate    = "presence:update"       // 用户上/下线，仅 staff 房间
+	EventChatMessage       = "chat:message"          // 群聊新消息，推 chat:{roomID}
+	EventChatMembership    = "chat:membership"       // 群成员关系变更（被踢/群解散/被邀请），推 user:{id}
+	EventNotificationNew   = "notification:new"      // 新站内通知（如群聊 @），推 user:{id}
+	EventFeedChanged       = "feed:changed"          // 帖子流有公开新内容（三期），全员广播
+	EventChatRecalled      = "chat:message_recalled" // 消息撤回，推 chat:{roomID}
+	EventChatMemberMuted   = "chat:member_muted"     // 成员被禁言/解禁，推 chat:{roomID}
+	EventChatUnread        = "chat:unread"           // 未读增量，推 user:{id}（未订阅房间也能实时角标）
+	EventModerationChanged = "moderation:changed"    // 待审队列变化，推 staff 房间（客户端各自 HTTP 校准角标）
+	EventSessionReplaced   = "session:replaced"      // 登录态被顶/被剔除，推 user:{id}（旧设备即时感知并提示重新登录）
 )
 
 // RoomStaff 管理团队房间（板块管理员及以上）

backend/router/router.go

@@ -101,6 +101,9 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 	postFileSvc.WithOperations(ops)
 	pointsSvc := service.NewPointsService(model.DB)
 	leaderboardSvc := service.NewLeaderboardService(model.DB)
+	librarySvc := service.NewLibraryService(model.DB, cfg.DataDir).
+		WithSetting(settingSvc).
+		WithUploadsDir(filepath.Join(cfg.DataDir, "uploads"))
 	adminUserSvc := service.NewAdminUserService(model.DB)
 	legacyImportSvc := service.NewLegacyImportService(model.DB, filepath.Join(cfg.DataDir, "uploads"))
 	moderationSvc := service.NewModerationService(model.DB, notifSvc)
@@ -118,11 +121,14 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 	if err := postFileSvc.EnsureDir(); err != nil {
 		return nil, err
 	}
+	if err := librarySvc.EnsureDir(); err != nil {
+		return nil, err
+	}
 	limiter := service.DefaultRateLimiter()
 
-	// 访问统计管道：攒批落库 + 保留期滚动清理（随进程生命周期）
-	pipeCtx, pipeCancel := context.WithCancel(context.Background())
-	defer pipeCancel()
+	// 访问统计管道：攒批落库 + 保留期滚动清理（随进程生命周期）。
+	// 不用 WithCancel+defer：Setup 返回即 cancel 会让落库协程在启动阶段就退出，事件永远不落库
+	pipeCtx := context.Background()
 	go visitSvc.StartFlusher(pipeCtx)
 	go visitSvc.RunRetention(pipeCtx)
 
@@ -155,8 +161,10 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		HidePwd:        service.NewHidePasswordCookie(cfg.JWTSecret, !cfg.DevMode),
 		Ads:            adSvc,
 		Sidebar:        service.NewSidebarService(model.DB),
+		FriendLink:     service.NewFriendLinkService(model.DB),
 		Badge:          badgeSvc,
 		LeaderboardSvc: leaderboardSvc,
+		LibrarySvc:     librarySvc,
 	}
 	// 通知落库后统一推 WS 红点（点赞/评论/审核/@ 等共用）
 	notifSvc.OnNotifyNew = func(userID uint) {
@@ -177,9 +185,15 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 	// 挂在 OptionalAuth 之后可顺带拿到登录用户
 	r.Use(middleware.VisitCapture(visitSvc))
 
+	// 上传文件长缓存（必须先于 r.Static 注册；文件名随机不覆盖，可 immutable）
+	r.Use(middleware.UploadStaticCache())
+
 	// 上传文件静态服务（data/uploads → /uploads）
 	r.Static("/uploads", filepath.Join(cfg.DataDir, "uploads"))
 
+	// 品牌图固定地址（友链等外部引用）：按站点设置解析到当前图，换图不变链
+	r.GET("/api/brand/:slot", h.BrandImage)
+
 	// 健康检查（sitemap / robots 由 Next.js Metadata Route 对外提供）
 	r.GET("/health", h.Health)
 
@@ -194,12 +208,12 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		pubAPI.GET("/boards/:id/sidebar", h.BoardSidebar)
 		pubAPI.GET("/overview", h.Overview)
 		pubAPI.GET("/sidebar", h.GetSidebar)
+		pubAPI.GET("/friend-links", h.GetFriendLinks)
 		pubAPI.GET("/posts", h.Posts)
 		pubAPI.GET("/posts/:id", h.PostDetail)
 		pubAPI.POST("/posts/:id/unlock-password", middleware.CSRFMiddleware(), middleware.RateLimitMiddleware(limiter, service.RateHidePassword), h.UnlockPostPassword)
 		pubAPI.GET("/posts/:id/attachments/:aid/download", h.DownloadPostAttachment)
 		pubAPI.GET("/posts/:id/comments", h.PostComments)
-		pubAPI.GET("/posts/:id/comments/:cid", h.CommentLocation)
 		pubAPI.GET("/users/:id", h.UserProfile)
 		pubAPI.GET("/users/:id/comments", h.UserComments)
 		pubAPI.GET("/users/:id/favorites", h.UserFavorites)
@@ -211,7 +225,13 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		pubAPI.GET("/settings", h.PublicSettings)
 		pubAPI.GET("/leaderboard", h.Leaderboard)
 		pubAPI.GET("/leaderboard/me", h.LeaderboardMe)
+		// 书库（公开浏览/下载；文件经专用端点消费，不进 /uploads 静态目录）
+		pubAPI.GET("/library", h.LibraryList)
+		pubAPI.GET("/library/:slug", h.LibraryDetail)
+		pubAPI.GET("/library/files/:fid/download", h.LibraryFileDownload)
 		pubAPI.GET("/site-state", h.SiteState)
+		// 自适应图片变体（?u=<源图URL>&w=<白名单宽度>，公开只读、immutable 缓存）
+		pubAPI.GET("/img", h.ImageVariant)
 		pubAPI.GET("/media/:object", h.PublicObject)
 		pubAPI.POST("/auth/code", middleware.CSRFMiddleware(), h.SendEmailCode)
 		pubAPI.POST("/auth/reset-password", middleware.CSRFMiddleware(), h.ResetPassword)
@@ -234,6 +254,10 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		api.GET("/me/login-devices", h.MyLoginDevices)
 		api.DELETE("/me/login-devices/:id", h.RevokeLoginDevice)
 		api.PUT("/profile", h.UpdateProfile)
+		// 友情链接申请（登录用户；提交后进 pending 待审批）
+		api.POST("/friend-links/apply", h.ApplyFriendLink)
+		api.GET("/friend-links/mine", h.MyFriendLinks)
+		api.PUT("/friend-links/:id", h.OwnerUpdateFriendLink)
 		api.POST("/posts", middleware.StaffExempt(middleware.RateLimitMiddleware(limiter, service.RatePost)), h.CreatePost)
 		api.PUT("/posts/:id", h.UpdatePost)
 		api.GET("/posts/:id/history", h.PostEditHistory)
@@ -281,6 +305,8 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 
 		// 时间线：从 Git commits 页导入（登录用户；适配器由超管配置）
 		api.POST("/timeline/from-git", middleware.StaffExempt(middleware.RateLimitUserMiddleware(limiter, service.RateTimelineGit)), h.TimelineFromGit)
+		// 时间线：从 Git releases 页导入更新日志
+		api.POST("/timeline/from-releases", middleware.StaffExempt(middleware.RateLimitUserMiddleware(limiter, service.RateTimelineGit)), h.TimelineFromReleases)
 
 		// 群聊（二期）：建群/成员/消息/未读；全站关闭消息时前台一律 403
 		chatAPI := api.Group("/chat", h.RequireMessagesOpen)
@@ -356,20 +382,52 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		// 群聊监管：移出后挂到 RequireAuth 组，允许「仅群管/消息 flag」用户访问
 		// （见下方 msgAPI）
 
-		// 站点公告文章管理（管理员及以上）
-		announceAPI := staffAPI.Group("", authMW.RequirePerm(service.PermAnnouncements))
+		// 渠道内容管理（公告/单页/书库/广告）：RequireActor 允许任意登录账号进入，
+		// 由 RequirePerm 按渠道权限码放行——角色默认管理员及以上，
+		// 超管/站长亦可将单个渠道授予板块管理员或普通用户（账号级授权）
+		permAPI := r.Group("/api/admin", authMW.RequireActor(), middleware.CSRFMiddleware())
+
+		// 站点公告文章管理（PermAnnouncements）
+		announceAPI := permAPI.Group("", authMW.RequirePerm(service.PermAnnouncements))
 		announceAPI.GET("/announcements", h.AdminListAnnouncements)
 		announceAPI.POST("/announcements", h.AdminCreateAnnouncement)
 		announceAPI.PUT("/announcements/:id", h.AdminUpdateAnnouncement)
 		announceAPI.POST("/announcements/:id/pin", h.AdminToggleAnnouncementPin)
 		announceAPI.DELETE("/announcements/:id", h.AdminDeleteAnnouncement)
-		announceAPI.GET("/pages", h.AdminListSitePages)
-		announceAPI.POST("/pages", h.AdminCreateSitePage)
-		announceAPI.PUT("/pages/:id", h.AdminUpdateSitePage)
-		announceAPI.DELETE("/pages/:id", h.AdminDeleteSitePage)
 
-		// 广告位管理（管理员及以上）
-		adsAPI := staffAPI.Group("", authMW.RequirePerm(service.PermAnnouncements))
+		// 站点单页管理（PermPages）
+		pagesAPI := permAPI.Group("", authMW.RequirePerm(service.PermPages))
+		pagesAPI.GET("/pages", h.AdminListSitePages)
+		pagesAPI.POST("/pages", h.AdminCreateSitePage)
+		pagesAPI.PUT("/pages/:id", h.AdminUpdateSitePage)
+		pagesAPI.DELETE("/pages/:id", h.AdminDeleteSitePage)
+		pagesAPI.DELETE("/pages/:id/purge", h.AdminPurgeSitePage)
+
+		// 书库管理（PermLibrary）
+		libraryAPI := permAPI.Group("/library", authMW.RequirePerm(service.PermLibrary))
+		{
+			libraryAPI.GET("/docs", h.AdminListLibraryDocs)
+			libraryAPI.GET("/export", h.AdminExportAllLibrary)
+			libraryAPI.POST("/import", middleware.RateLimitMiddleware(limiter, service.RateUpload), h.AdminImportLibrary)
+			libraryAPI.GET("/docs/:id/export", h.AdminExportLibraryDoc)
+			libraryAPI.POST("/docs", h.AdminCreateLibraryDoc)
+			libraryAPI.PUT("/docs/:id", h.AdminUpdateLibraryDoc)
+			libraryAPI.DELETE("/docs/:id", h.AdminDeleteLibraryDoc)
+			libraryAPI.DELETE("/docs/:id/purge", h.AdminPurgeLibraryDoc)
+			libraryAPI.POST("/docs/:id/files", middleware.RateLimitMiddleware(limiter, service.RateUpload), h.AdminUploadLibraryFile)
+			libraryAPI.DELETE("/files/:fid", h.AdminDeleteLibraryFile)
+			// 章节（两级树：章 → 节）
+			libraryAPI.POST("/docs/:id/sections", h.AdminCreateLibrarySection)
+			libraryAPI.PUT("/sections/:sid", h.AdminUpdateLibrarySection)
+			libraryAPI.DELETE("/sections/:sid", h.AdminDeleteLibrarySection)
+			libraryAPI.POST("/sections/:sid/move", h.AdminMoveLibrarySection)
+			libraryAPI.POST("/docs/:id/import-md", middleware.RateLimitMiddleware(limiter, service.RateUpload), h.AdminImportLibraryMarkdown)
+			libraryAPI.POST("/docs/:id/import-md-batch", middleware.RateLimitMiddleware(limiter, service.RateUpload), h.AdminImportLibraryMarkdownBatch)
+			libraryAPI.POST("/cover/from-media", middleware.RateLimitMiddleware(limiter, service.RateUpload), h.UploadLibraryCoverFromMedia)
+		}
+
+		// 广告位管理（PermAds）
+		adsAPI := permAPI.Group("", authMW.RequirePerm(service.PermAds))
 		adsAPI.GET("/ads/config", h.AdminGetAdsConfig)
 		adsAPI.PUT("/ads/config", h.AdminSaveAdsConfig)
 		adsAPI.GET("/ads", h.AdminListAds)
@@ -400,6 +458,16 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		staffAPI.PUT("/sidebar/widgets/:id", authMW.RequirePerm(service.PermSettings), h.AdminUpdateSidebarWidget)
 		staffAPI.DELETE("/sidebar/widgets/:id", authMW.RequirePerm(service.PermSettings), h.AdminDeleteSidebarWidget)
 
+		// 友情链接管理（超级管理员/站长）：CRUD + 审批
+		friendLinkAPI := staffAPI.Group("/friend-links", authMW.RequirePerm(service.PermSettings))
+		{
+			friendLinkAPI.GET("", h.AdminListFriendLinks)
+			friendLinkAPI.POST("", h.AdminCreateFriendLink)
+			friendLinkAPI.PUT("/:id", h.AdminUpdateFriendLink)
+			friendLinkAPI.POST("/:id/status", h.AdminSetFriendLinkStatus)
+			friendLinkAPI.DELETE("/:id", h.AdminDeleteFriendLink)
+		}
+
 		// 站点设置（超级管理员/站长）
 		staffAPI.GET("/settings", authMW.RequirePerm(service.PermSettings), h.AdminGetSettings)
 		opsAPI := staffAPI.Group("/settings/modules", authMW.RequirePerm(service.PermSettings))
@@ -426,6 +494,8 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 			usersAPI.GET("/users", h.AdminListUsers)
 			usersAPI.PUT("/users/:id/role", h.AdminUpdateUserRole)
 			usersAPI.PUT("/users/:id/messages", h.AdminSetUserMessages)
+			usersAPI.GET("/users/:id/perms", h.AdminGetUserPerms)
+			usersAPI.PUT("/users/:id/perms", h.AdminSetUserPerms)
 			usersAPI.PUT("/users/:id/ban", h.AdminSetUserBan)
 			usersAPI.GET("/users/:id/login-logs", h.AdminUserLoginLogs)
 			// 积分管理：手动调整（加分计累计/扣分仅扣余额）与积分流水分页

backend/service/actor.go

@@ -1,6 +1,8 @@
 package service
 
 import (
+	"encoding/json"
+	"sort"
 	"strings"
 
 	"github.com/freefire/jiang13-bbs/model"
@@ -10,21 +12,119 @@ import (
 // 板块管理员的板块范围由 Actor.BoardIDs 在业务层二次校验。
 const (
 	PermUsers         = "users"         // 用户与权限管理（超管/站长）
-	PermAnnouncements = "announcements" // 公告管理（管理员及以上）
+	PermAnnouncements = "announcements" // 公告管理（管理员及以上；可账号级授予）
+	PermPages         = "pages"         // 单页管理（管理员及以上；可账号级授予）
+	PermLibrary       = "library"       // 书库管理（管理员及以上；可账号级授予）
+	PermAds           = "ads"           // 广告与赞助管理（管理员及以上；可账号级授予）
 	PermSettings      = "settings"      // 站点外观设置（超管/站长）
 	PermModeration    = "moderation"    // 内容审核（任意管理角色，板块范围受限）
 	PermMessages      = "messages"      // 后台消息管理（站长/超管/站点消息 flag；群管另有业务层放行）
 	PermBoards        = "boards"        // 板块管理（仅站长）
 )
 
+// GrantablePerms 可账号级授予的渠道权限码（授予者需持有 PermUsers）。
+// 管理员及以上角色对这些渠道为角色自带，账号级授予只对板块管理员/普通用户生效。
+var GrantablePerms = []string{PermAnnouncements, PermPages, PermLibrary, PermAds}
+
+// ValidPermOverride 权限码是否可被账号级授予
+func ValidPermOverride(p string) bool {
+	for _, g := range GrantablePerms {
+		if p == g {
+			return true
+		}
+	}
+	return false
+}
+
+// NormalizePermOverrides 白名单过滤 + 去重 + 排序，得到可落库的权限码集
+func NormalizePermOverrides(perms []string) []string {
+	seen := map[string]bool{}
+	out := make([]string, 0, len(perms))
+	for _, p := range perms {
+		p = strings.TrimSpace(p)
+		if p == "" || seen[p] || !ValidPermOverride(p) {
+			continue
+		}
+		seen[p] = true
+		out = append(out, p)
+	}
+	sort.Strings(out)
+	return out
+}
+
+// ParsePermOverrides 解析 users.perm_overrides JSON 列（容错：非法内容视为空）
+func ParsePermOverrides(raw string) []string {
+	if raw == "" {
+		return []string{}
+	}
+	var arr []string
+	if err := json.Unmarshal([]byte(raw), &arr); err != nil {
+		return []string{}
+	}
+	return NormalizePermOverrides(arr)
+}
+
+// SerializePermOverrides 序列化为落库 JSON（空集统一 "[]"，避免 NULL/空串分歧）
+func SerializePermOverrides(perms []string) string {
+	norm := NormalizePermOverrides(perms)
+	b, err := json.Marshal(norm)
+	if err != nil {
+		return "[]"
+	}
+	return string(b)
+}
+
+// roleDefaultPerm 角色对功能点的固有权限（不含账号级授予）
+func roleDefaultPerm(role model.Role, p string) bool {
+	switch p {
+	case PermBoards:
+		return role == model.RoleOwner
+	case PermUsers, PermSettings:
+		return role == model.RoleSuperAdmin || role == model.RoleOwner
+	case PermAnnouncements, PermPages, PermLibrary, PermAds:
+		return model.RoleLevel(role) >= model.RoleLevel(model.RoleAdmin)
+	case PermModeration:
+		return model.IsStaff(role)
+	}
+	return false
+}
+
+// EffectivePerms 生效权限码列表（角色默认 ∪ 账号授予 + 消息管理），
+// 供 /me 下发，前端据此渲染后台入口/按钮；最终权限仍以 HasPerm 校验为准。
+func EffectivePerms(role model.Role, permOverridesRaw string, canManageMessages bool) []string {
+	set := map[string]bool{}
+	all := append([]string{
+		PermUsers, PermAnnouncements, PermPages, PermLibrary, PermAds,
+		PermSettings, PermModeration, PermBoards,
+	}, GrantablePerms...)
+	for _, p := range all {
+		if roleDefaultPerm(role, p) {
+			set[p] = true
+		}
+	}
+	for _, p := range ParsePermOverrides(permOverridesRaw) {
+		set[p] = true
+	}
+	if role == model.RoleOwner || role == model.RoleSuperAdmin || canManageMessages {
+		set[PermMessages] = true
+	}
+	out := make([]string, 0, len(set))
+	for p := range set {
+		out = append(out, p)
+	}
+	sort.Strings(out)
+	return out
+}
+
 // Actor 当前请求操作者的实时权限快照（每次后台请求从 DB 现取，
 // 不依赖 JWT 内的 role claim，角色/授权变更立即生效）
 type Actor struct {
 	ID                uint
 	Username          string
 	Role              model.Role
-	BoardIDs          []uint // 板块管理员被授权的板块；其他角色为空
-	CanManageMessages bool   // 站点级消息管理 flag（站长授予）；站长/超管不必依赖此字段
+	BoardIDs          []uint   // 板块管理员被授权的板块；其他角色为空
+	CanManageMessages bool     // 站点级消息管理 flag（站长授予）；站长/超管不必依赖此字段
+	ExtraPerms        []string // 账号级授予的渠道权限（角色固有之外的增量）
 }
 
 // IsStaff 是否管理团队成员
@@ -32,23 +132,22 @@ func (a *Actor) IsStaff() bool {
 	return a != nil && model.IsStaff(a.Role)
 }
 
-// HasPerm 是否拥有某后台功能点
+// HasPerm 是否拥有某后台功能点：角色固有权限 ∪ 账号级授予
 func (a *Actor) HasPerm(p string) bool {
 	if a == nil {
 		return false
 	}
-	switch p {
-	case PermBoards:
-		return a.Role == model.RoleOwner
-	case PermUsers, PermSettings:
-		return a.Role == model.RoleSuperAdmin || a.Role == model.RoleOwner
-	case PermAnnouncements:
-		return model.RoleLevel(a.Role) >= model.RoleLevel(model.RoleAdmin)
-	case PermModeration:
-		return a.IsStaff()
-	case PermMessages:
+	if roleDefaultPerm(a.Role, p) {
+		return true
+	}
+	if p == PermMessages {
 		return a.HasSiteMessagePerm()
 	}
+	for _, e := range a.ExtraPerms {
+		if e == p {
+			return true
+		}
+	}
 	return false
 }
 
@@ -113,15 +212,16 @@ func (a *Actor) CanAssignRole(target model.Role) bool {
 	return a.HasPerm(PermUsers)
 }
 
-// LoadActor 读取用户实时角色与板块授权
+// LoadActor 读取用户实时角色、板块授权与账号级渠道权限
 func (s *AuthService) LoadActor(id uint) (*Actor, error) {
 	var u model.User
-	if err := s.db.Select("id", "username", "role", "can_manage_messages").First(&u, id).Error; err != nil {
+	if err := s.db.Select("id", "username", "role", "can_manage_messages", "perm_overrides").First(&u, id).Error; err != nil {
 		return nil, err
 	}
 	actor := &Actor{
 		ID: u.ID, Username: u.Username, Role: u.Role, BoardIDs: []uint{},
 		CanManageMessages: u.CanManageMessages,
+		ExtraPerms:        ParsePermOverrides(u.PermOverrides),
 	}
 	if u.Role == model.RoleBoardAdmin {
 		var ids []uint

backend/service/ad.go

@@ -17,25 +17,25 @@ import (
 const (
 	SettingKeyAdsConfig = "ads_config"
 
-	AdMaxTitleRunes  = 24
-	AdMaxNoteRunes   = 100
-	AdMaxImageShow   = 5
-	AdMaxTextShow    = 6
-	AdMaxActiveShow  = AdMaxImageShow + AdMaxTextShow
-	AdDefaultTitle   = "自助推广"
+	AdMaxTitleRunes = 24
+	AdMaxNoteRunes  = 100
+	AdMaxImageShow  = 5
+	AdMaxTextShow   = 6
+	AdMaxActiveShow = AdMaxImageShow + AdMaxTextShow
+	AdDefaultTitle  = "自助推广"
 )
 
 var (
-	ErrAdNotFound      = errors.New("广告不存在")
-	ErrAdForbidden     = errors.New("无权操作")
-	ErrAdInvalid       = errors.New("广告参数无效")
-	ErrAdCaptcha       = errors.New("验证码错误或已过期")
-	ErrAdDisabled      = errors.New("自助推广暂未开放")
-	ErrAdBadPayment    = errors.New("请选择有效的支付方式")
-	ErrAdBadDuration   = errors.New("请选择有效的投放时长")
-	hexColorRe         = regexp.MustCompile(`^#([0-9a-fA-F]{6})$`)
-	adImageHTTPSRe     = regexp.MustCompile(`(?i)^https://[^\s\\]{1,500}$`)
-	adImageUploadRe    = regexp.MustCompile(`(?i)^/uploads/(ads|images|brand)/[0-9a-f]{32}\.(png|jpe?g|gif|webp)$`)
+	ErrAdNotFound    = errors.New("广告不存在")
+	ErrAdForbidden   = errors.New("无权操作")
+	ErrAdInvalid     = errors.New("广告参数无效")
+	ErrAdCaptcha     = errors.New("验证码错误或已过期")
+	ErrAdDisabled    = errors.New("自助推广暂未开放")
+	ErrAdBadPayment  = errors.New("请选择有效的支付方式")
+	ErrAdBadDuration = errors.New("请选择有效的投放时长")
+	hexColorRe       = regexp.MustCompile(`^#([0-9a-fA-F]{6})$`)
+	adImageHTTPSRe   = regexp.MustCompile(`(?i)^https://[^\s\\]{1,500}$`)
+	adImageUploadRe  = regexp.MustCompile(`(?i)^/uploads/(ads|images|brand)/[0-9a-f]{32}\.(png|jpe?g|gif|webp)$`)
 )
 
 // AdDurationOption 可购时长档位（图片 / 文字广告分别计价）

backend/service/admin_content.go

@@ -49,11 +49,11 @@ const (
 
 // AdminContentCounts 当前操作者可见范围内的数量（用于页内 Tab）
 type AdminContentCounts struct {
-	PostsLive      int64 `json:"posts_live"`
-	PostsPending   int64 `json:"posts_pending"`
-	PostsRejected  int64 `json:"posts_rejected"`
-	PostsDeleted   int64 `json:"posts_deleted"`
-	CommentsLive   int64 `json:"comments_live"`
+	PostsLive        int64 `json:"posts_live"`
+	PostsPending     int64 `json:"posts_pending"`
+	PostsRejected    int64 `json:"posts_rejected"`
+	PostsDeleted     int64 `json:"posts_deleted"`
+	CommentsLive     int64 `json:"comments_live"`
 	CommentsPending  int64 `json:"comments_pending"`
 	CommentsRejected int64 `json:"comments_rejected"`
 	CommentsDeleted  int64 `json:"comments_deleted"`
@@ -61,32 +61,34 @@ type AdminContentCounts struct {
 
 // AdminContentPost 后台帖子列表项
 type AdminContentPost struct {
-	ID           uint       `json:"id"`
-	Title        string     `json:"title"`
-	Status       string     `json:"status"`
-	Deleted      bool       `json:"deleted"`
-	DeletedAt    *time.Time `json:"deleted_at,omitempty"`
-	CreatedAt    time.Time  `json:"created_at"`
-	CommentCount int        `json:"comment_count"`
-	BoardID      uint       `json:"board_id"`
+	ID           uint        `json:"id"`
+	Title        string      `json:"title"`
+	Status       string      `json:"status"`
+	Deleted      bool        `json:"deleted"`
+	DeletedAt    *time.Time  `json:"deleted_at,omitempty"`
+	CreatedAt    time.Time   `json:"created_at"`
+	CommentCount int         `json:"comment_count"`
+	BoardID      uint        `json:"board_id"`
 	Board        model.Board `json:"board"`
-	User         model.User `json:"user"`
+	User         model.User  `json:"user"`
 }
 
 // AdminContentComment 后台评论列表项
 type AdminContentComment struct {
-	ID        uint       `json:"id"`
-	PostID    uint       `json:"post_id"`
-	PostTitle string     `json:"post_title"`
-	BoardID   uint       `json:"board_id"`
-	Content   string     `json:"content"`
-	Status    string     `json:"status"`
-	Edited    bool       `json:"edited"` // 相对创建已编辑（同评论侧规则），用于隐藏无修订的历史入口
-	Deleted   bool       `json:"deleted"`
-	DeletedAt *time.Time `json:"deleted_at,omitempty"`
-	CreatedAt time.Time  `json:"created_at"`
+	ID        uint        `json:"id"`
+	PostID    uint        `json:"post_id"`
+	PostTitle string      `json:"post_title"`
+	BoardID   uint        `json:"board_id"`
+	Content   string      `json:"content"`
+	Status    string      `json:"status"`
+	Edited    bool        `json:"edited"` // 相对创建已编辑（同评论侧规则），用于隐藏无修订的历史入口
+	Deleted   bool        `json:"deleted"`
+	DeletedAt *time.Time  `json:"deleted_at,omitempty"`
+	CreatedAt time.Time   `json:"created_at"`
+	Floor     uint        `json:"floor"`   // 所属楼层相对序号
+	IsRoot    bool        `json:"is_root"` // 主楼/楼中楼，供前台拼 #comment-{floor}[-r{id}]
 	Board     model.Board `json:"board"`
-	User      model.User `json:"user"`
+	User      model.User  `json:"user"`
 }
 
 func normalizeAdminStatus(raw string) AdminContentStatus {
@@ -270,6 +272,11 @@ func (s *ModerationService) ListAdminComments(actor *Actor, status, keyword stri
 	}
 
 	items := make([]AdminContentComment, 0, len(rows))
+	commentIDs := make([]uint, 0, len(rows))
+	for _, r := range rows {
+		commentIDs = append(commentIDs, r.ID)
+	}
+	anchors := CommentAnchors(s.db, commentIDs)
 	for _, r := range rows {
 		it := AdminContentComment{
 			ID:        r.ID,
@@ -283,6 +290,10 @@ func (s *ModerationService) ListAdminComments(actor *Actor, status, keyword stri
 			Board:     boards[r.BoardID],
 			User:      users[r.UserID],
 		}
+		if a, ok := anchors[r.ID]; ok {
+			it.Floor = a.Floor
+			it.IsRoot = a.IsRoot
+		}
 		if r.DeletedAt.Valid {
 			it.Deleted = true
 			t := r.DeletedAt.Time

backend/service/admin_user.go

@@ -54,6 +54,7 @@ type AdminUserItem struct {
 	BoardIDs          []uint     `json:"board_ids"`
 	Banned            bool       `json:"banned"`
 	CanManageMessages bool       `json:"can_manage_messages"`
+	PermOverrides     []string   `json:"perm_overrides"` // 账号级渠道权限（角色固有之外的增量授予）
 	PostCount         int64      `json:"post_count"`
 	CommentCount      int64      `json:"comment_count"`
 	Points            int        `json:"points"`
@@ -71,7 +72,7 @@ type AdminUserItem struct {
 // - total / admins / banned：筛选 Tab 角标（不在顶部卡片展示，避免与仪表盘重复）
 type AdminUserSummary struct {
 	Online          int64 `json:"online"`
-	InCooldown       int64 `json:"in_cooldown"`
+	InCooldown      int64 `json:"in_cooldown"`
 	Active7d        int64 `json:"active_7d"`
 	FailedLogins24h int64 `json:"failed_logins_24h"`
 	Total           int64 `json:"total"`
@@ -237,6 +238,7 @@ func (s *AdminUserService) toItems(users []model.User) []AdminUserItem {
 			BoardIDs:          []uint{},
 			Banned:            u.Banned,
 			CanManageMessages: u.CanManageMessages,
+			PermOverrides:     ParsePermOverrides(u.PermOverrides),
 			Points:            u.Points,
 			TotalPoints:       u.TotalPoints,
 			Level:             u.Level,
@@ -407,6 +409,12 @@ func (s *AdminUserService) SetStaff(operator *Actor, targetID uint, role model.R
 				return err
 			}
 		}
+		// 升至管理员及以上后渠道权限变为角色自带，账号级授予清空以免误导
+		if roleChanged && model.RoleLevel(role) >= model.RoleLevel(model.RoleAdmin) && u.PermOverrides != "" && u.PermOverrides != "[]" {
+			if err := tx.Model(&u).Update("perm_overrides", "[]").Error; err != nil {
+				return err
+			}
+		}
 		return nil
 	})
 	if err != nil {
@@ -415,6 +423,53 @@ func (s *AdminUserService) SetStaff(operator *Actor, targetID uint, role model.R
 	return s.getItem(s.db, targetID)
 }
 
+// GetPermOverrides 读取目标账号的渠道权限（PermUsers 持有者可读，供授权弹窗回显）
+func (s *AdminUserService) GetPermOverrides(operator *Actor, targetID uint) ([]string, error) {
+	if operator == nil || !operator.HasPerm(PermUsers) {
+		return nil, ErrCannotAssignRole
+	}
+	var u model.User
+	if err := s.db.Select("id", "perm_overrides").First(&u, targetID).Error; err != nil {
+		return nil, err
+	}
+	return ParsePermOverrides(u.PermOverrides), nil
+}
+
+// SetPermOverrides 授予/撤销账号级渠道权限（公告/单页/书库/广告）。
+// 授予者需持有 PermUsers（超管/站长）；目标为管理员及以上时渠道为角色自带，
+// 授权无意义，强制清空。Actor 每次请求现查 DB，变更即时生效，无需强制下线。
+func (s *AdminUserService) SetPermOverrides(operator *Actor, targetID uint, perms []string) (*AdminUserItem, error) {
+	if operator == nil || !operator.HasPerm(PermUsers) {
+		return nil, ErrCannotAssignRole
+	}
+	if operator.ID == targetID {
+		return nil, ErrAdminSelfAction
+	}
+	norm := NormalizePermOverrides(perms)
+	err := s.db.Transaction(func(tx *gorm.DB) error {
+		var u model.User
+		if err := tx.First(&u, targetID).Error; err != nil {
+			return err
+		}
+		if u.Role == model.RoleOwner {
+			return ErrProtectedOwner
+		}
+		// 管理员及以上角色自带全部渠道权限，账号级授予保持为空
+		if model.RoleLevel(u.Role) >= model.RoleLevel(model.RoleAdmin) {
+			norm = []string{}
+		}
+		raw := SerializePermOverrides(norm)
+		if u.PermOverrides == raw {
+			return nil
+		}
+		return tx.Model(&u).Update("perm_overrides", raw).Error
+	})
+	if err != nil {
+		return nil, err
+	}
+	return s.getItem(s.db, targetID)
+}
+
 // SetCanManageMessages 站长授予/撤销站点消息管理权限（不可操作站长账号与自己）
 func (s *AdminUserService) SetCanManageMessages(operator *Actor, targetID uint, enabled bool) (*AdminUserItem, error) {
 	if operator == nil || operator.Role != model.RoleOwner {
@@ -564,12 +619,12 @@ func normalizeAuditPage(page, size int) (int, int) {
 
 // AdminUserAuditProfile 站长查看用户档案摘要
 type AdminUserAuditProfile struct {
-	User            AdminUserItem `json:"user"`
-	PostsTotal      int64         `json:"posts_total"`      // 含各状态与软删
-	CommentsTotal   int64         `json:"comments_total"`   // 含各状态与软删
-	MessagesTotal   int64         `json:"messages_total"`   // 含撤回与软删
-	PublishedPosts  int64         `json:"published_posts"`
-	PublishedComments int64       `json:"published_comments"`
+	User              AdminUserItem `json:"user"`
+	PostsTotal        int64         `json:"posts_total"`    // 含各状态与软删
+	CommentsTotal     int64         `json:"comments_total"` // 含各状态与软删
+	MessagesTotal     int64         `json:"messages_total"` // 含撤回与软删
+	PublishedPosts    int64         `json:"published_posts"`
+	PublishedComments int64         `json:"published_comments"`
 }
 
 // AdminAuditPostItem 审计帖子行
@@ -594,6 +649,8 @@ type AdminAuditCommentItem struct {
 	Deleted   bool       `json:"deleted"`
 	CreatedAt time.Time  `json:"created_at"`
 	DeletedAt *time.Time `json:"deleted_at,omitempty"`
+	Floor     uint       `json:"floor"`
+	IsRoot    bool       `json:"is_root"`
 }
 
 // AdminAuditMessageItem 审计聊天消息行
@@ -686,6 +743,11 @@ func (s *AdminUserService) ListAuditComments(actor *Actor, userID uint, page, si
 		Offset((page - 1) * size).Limit(size).Find(&comments).Error; err != nil {
 		return nil, 0, page, err
 	}
+	commentIDs := make([]uint, 0, len(comments))
+	for _, c := range comments {
+		commentIDs = append(commentIDs, c.ID)
+	}
+	anchors := CommentAnchors(s.db, commentIDs)
 	items := make([]AdminAuditCommentItem, 0, len(comments))
 	for _, c := range comments {
 		it := AdminAuditCommentItem{
@@ -695,6 +757,10 @@ func (s *AdminUserService) ListAuditComments(actor *Actor, userID uint, page, si
 			Status:    c.Status,
 			CreatedAt: c.CreatedAt,
 		}
+		if a, ok := anchors[c.ID]; ok {
+			it.Floor = a.Floor
+			it.IsRoot = a.IsRoot
+		}
 		if c.DeletedAt.Valid {
 			it.Deleted = true
 			t := c.DeletedAt.Time

backend/service/auth.go

@@ -24,10 +24,15 @@ const (
 	// CSRFHeaderName 前端传递 CSRF token 的 header 名
 	CSRFHeaderName = "X-CSRF-Token"
 
-	// AccessTokenTTL access token 有效期（短期，降低被盗窗口）
-	AccessTokenTTL = 15 * time.Minute
-	// RefreshTokenTTL refresh token 有效期（长期）
-	RefreshTokenTTL = 7 * 24 * time.Hour
+	// AccessTokenTTL access token 有效期。安全性由每请求实时校验
+	// （token_version + 封禁 + 会话家族活性）保证，吊销即时生效，故取 7 天：
+	// 登录后 7 天内即使零轮转也保证不掉线，覆盖移动端长期待机场景。
+	// （15min 短期 TTL 时代待机后必删 cookie，唤醒恢复全靠轮转链，
+	// 是手机端弹"登录已失效"的主因）
+	AccessTokenTTL = 7 * 24 * time.Hour
+	// RefreshTokenTTL refresh token 有效期（每次轮转重置 = 活跃用户滑动续期），
+	// 30 天内有过访问即持续在线；连续 30 天完全不访问才需重新登录
+	RefreshTokenTTL = 30 * 24 * time.Hour
 	// RefreshRotationGrace 轮转宽限期：同枚旧 refresh 在此窗口内被并发重放时，
 	// 返回同一个新 token 对（放行），超过窗口的重放视为盗用（OAuth BCP 模式）
 	RefreshRotationGrace = 60 * time.Second
@@ -282,7 +287,9 @@ var (
 var (
 	ErrRefreshInvalid = errors.New("refresh token 无效")
 	ErrRefreshExpired = errors.New("refresh token 已过期")
-	ErrRefreshReused  = errors.New("refresh token 存在重用嫌疑")
+	// errReplayChainDead 宽限期外重放时，token 所在轮转链已无有效头节点
+	// （家族被整体吊销：设备剔除/超限淘汰/改密/封禁），属真实失效
+	errReplayChainDead = errors.New("refresh token 轮转链已无有效会话")
 )
 
 // hashRefreshToken refresh token 只以 SHA-256 形式落库
@@ -401,7 +408,8 @@ func (s *AuthService) ValidateRefreshToken(token string) (*model.User, error) {
 //   - 正常：旧行吊销并链接到新行，返回新 access + 新 refresh
 //   - 宽限期并发重放（RSC 预取/多实例几乎同时到达）：返回【同一个】新 token 对，
 //     不再轮转，避免浏览器收到互相吊销的两套 cookie 而随机掉线
-//   - 吊销后重放（被盗信号）：撤销该用户全部 refresh token，强制重新登录
+//   - 宽限期外重放（轮换响应丢失后浏览器补投旧 token）：轮转链头节点仍健康时
+//     返回头节点 token 对自愈放行；整链已死才是真失效（见 healReplayFromHead）
 func (s *AuthService) RotateRefreshToken(oldToken, ip, ua string) (string, string, *model.User, error) {
 	var (
 		accessToken, newRefresh string
@@ -412,6 +420,11 @@ func (s *AuthService) RotateRefreshToken(oldToken, ip, ua string) (string, strin
 		var rt model.RefreshToken
 		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
 			Where("token_hash = ?", hashRefreshToken(oldToken)).First(&rt).Error; err != nil {
+			if !errors.Is(err, gorm.ErrRecordNotFound) {
+				// 数据库故障 ≠ 凭据无效：透传给上层按"服务暂不可用"处理，
+				// 不得据此清除用户 cookie（否则 DB 抖动会变成全员强制重登）
+				return err
+			}
 			outErr = ErrRefreshInvalid
 			return nil
 		}
@@ -441,17 +454,24 @@ func (s *AuthService) RotateRefreshToken(oldToken, ip, ua string) (string, strin
 					}
 				}
 			}
-			// 其他吊销后重放：判定为盗用，仅撤销该轮转链所在家族（OAuth BCP：
-			// 被盗的是这台设备的链，不牵连用户其余登录设备——否则开发期
-			// middleware/浏览器丢轮换的竞态会把所有设备一齐踢下线）
-			fam := sessionFamilyID(rt)
-			if err := tx.Model(&model.RefreshToken{}).
-				Where("(family_id = ? OR id = ?) AND revoked = ?", fam, fam, false).
-				Updates(map[string]any{"revoked": true, "token_cipher": "", "updated_at": now}).Error; err != nil {
-				return err
+			// 宽限期外重放：真实浏览器里最常见成因不是盗用，而是轮换响应丢失
+			// （RSC 预取被浏览器中止、移动端切后台挂起截断请求、middleware 超时
+			// 放弃、网络抖动）——后端已完成轮转落库，但 Set-Cookie 没进浏览器
+			// jar，旧 token 因此变成"已吊销"。若按盗用吊销整个家族，等价于把
+			// 无辜设备强制下线（"登录已失效"弹窗的主要来源）。故沿 rotated_to
+			// 链找头节点：仍健康则补发头节点 token 对自愈；整链已死才是真失效。
+			at, plain, healedUser, healErr := s.healReplayFromHead(tx, &rt, now)
+			if healErr == nil {
+				accessToken, newRefresh, outUser = at, plain, healedUser
+				return nil
 			}
-			log.Printf("[auth] 检测到 refresh token 吊销后重放，已撤销 family=%d 的 refresh token", fam)
-			outErr = ErrRefreshReused
+			if !errors.Is(healErr, errReplayChainDead) {
+				// 封禁等账号级错误透传，让前端给出对应告知
+				outErr = healErr
+				return nil
+			}
+			log.Printf("[auth] refresh 宽限期外重放且轮转链已失效，拒绝 family=%d", sessionFamilyID(rt))
+			outErr = ErrRefreshInvalid
 			return nil
 		}
 
@@ -510,6 +530,46 @@ func (s *AuthService) RotateRefreshToken(oldToken, ip, ua string) (string, strin
 	return accessToken, newRefresh, outUser, nil
 }
 
+// healReplayFromHead 宽限期外的同链重放自愈：沿 rotated_to 轮转链走到头节点
+// （该会话家族当前生效的 refresh token），头节点仍健康则返回其 token 对——
+// 等价于把丢失的轮换响应补投给浏览器。链已断/头已死（家族被整体吊销）时
+// 返回 errReplayChainDead；用户被封禁时透传 ErrAccountBanned。
+// 安全取舍：放行重放意味着偷到旧 token 者也能追上当前会话，故仅在此处用
+// 可用性换安全（HttpOnly cookie 下旧 token 外泄门槛高，且改密/封禁/剔除
+// 设备仍可随时终止会话）；头部吊销型处置（改密、封禁、剔除、超限淘汰）
+// 之后链上无活头节点，自愈自然失效，不会被绕过。
+func (s *AuthService) healReplayFromHead(tx *gorm.DB, rt *model.RefreshToken, now time.Time) (string, string, *model.User, error) {
+	cur := *rt
+	// 迭代上限防御脏数据成环；正常链长即 7 天寿命内的轮转次数
+	for i := 0; cur.Revoked && i < 128; i++ {
+		if cur.RotatedTo == 0 {
+			return "", "", nil, errReplayChainDead
+		}
+		var next model.RefreshToken
+		if err := tx.First(&next, cur.RotatedTo).Error; err != nil {
+			return "", "", nil, errReplayChainDead
+		}
+		cur = next
+	}
+	if cur.Revoked || cur.UserID != rt.UserID || now.After(cur.ExpiresAt) || cur.TokenCipher == "" {
+		return "", "", nil, errReplayChainDead
+	}
+	user, err := s.loadActiveUser(tx, cur.UserID)
+	if err != nil {
+		return "", "", nil, err
+	}
+	plain, err := s.decryptToken(cur.TokenCipher)
+	if err != nil {
+		return "", "", nil, errReplayChainDead
+	}
+	at, err := s.generateToken(user, sessionFamilyID(cur))
+	if err != nil {
+		return "", "", nil, err
+	}
+	log.Printf("[auth] refresh 宽限期外重放，轮转链头节点仍健康，自愈放行 family=%d", sessionFamilyID(cur))
+	return at, plain, user, nil
+}
+
 // RevokeRefreshToken 撤销单个 refresh token（单设备登出时用）
 func (s *AuthService) RevokeRefreshToken(token string) error {
 	if token == "" {

backend/service/brand.go

@@ -24,6 +24,12 @@ const (
 	BrandSlotDark    = "logo_dark"
 	BrandSlotFavicon = "favicon"
 
+	// 固定对外地址：外部（友链等）引用这些路径，站点换图后地址不变。
+	// 实际文件仍存随机名，请求时按站点设置解析到当前图。
+	BrandAliasPathLight   = "/api/brand/logo-light"
+	BrandAliasPathDark    = "/api/brand/logo-dark"
+	BrandAliasPathFavicon = "/api/brand/favicon"
+
 	BrandMarkImageText = "image_text"
 	BrandMarkImage     = "image"
 	BrandMarkText      = "text"

backend/service/brand_store.go

@@ -183,6 +183,22 @@ func (s *UploadService) BrandFileExists(url string) bool {
 	return err == nil && !info.IsDir()
 }
 
+// OpenBrandFile 打开品牌图文件供对外服务；未设置或文件缺失返回 os.ErrNotExist
+func (s *UploadService) OpenBrandFile(url string) (*os.File, error) {
+	if BrandRelPath(url) == "" {
+		return nil, os.ErrNotExist
+	}
+	abs, ok := s.safeUploadPath(url)
+	if !ok {
+		return nil, os.ErrNotExist
+	}
+	f, err := os.Open(abs)
+	if err != nil {
+		return nil, os.ErrNotExist
+	}
+	return f, nil
+}
+
 // RemoveBrandIfUnused 旧品牌图不再被任一槽位引用时删除
 func (s *UploadService) RemoveBrandIfUnused(oldURL, light, dark, favicon string) {
 	if oldURL == "" || oldURL == light || oldURL == dark || oldURL == favicon {

backend/service/brand_test.go

@@ -1,6 +1,34 @@
 package service
 
-import "testing"
+import (
+	"errors"
+	"os"
+	"testing"
+)
+
+func TestOpenBrandFile(t *testing.T) {
+	s, dir := newMediaLibraryService(t)
+	png := "/uploads/brand/0123456789abcdef0123456789abcdef.png"
+	if _, err := s.OpenBrandFile(png); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("missing file want ErrNotExist, got %v", err)
+	}
+	writeMediaFile(t, dir, "brand/0123456789abcdef0123456789abcdef.png", []byte("png"))
+	f, err := s.OpenBrandFile(png)
+	if err != nil {
+		t.Fatal(err)
+	}
+	f.Close()
+	for _, bad := range []string{
+		"",
+		"/uploads/images/0123456789abcdef0123456789abcdef.png",
+		"/uploads/brand/../avatars/x.png",
+		"http://evil.test/x.png",
+	} {
+		if _, err := s.OpenBrandFile(bad); !errors.Is(err, os.ErrNotExist) {
+			t.Fatalf("should reject %q, got %v", bad, err)
+		}
+	}
+}
 
 func TestNormalizeBrandURL(t *testing.T) {
 	png := "/uploads/brand/0123456789abcdef0123456789abcdef.png"

backend/service/chat.go

@@ -75,8 +75,8 @@ type RoomView struct {
 	Joined      bool        `json:"joined"`
 	MyRole      string      `json:"my_role"`
 	UnreadCount int64       `json:"unread_count"`
-	Pinned      bool        `json:"pinned"`      // 对当前用户是否置顶（含大厅强制）
-	PinForced   bool        `json:"pin_forced"`  // 大厅强制置顶，不可取消
+	Pinned      bool        `json:"pinned"`         // 对当前用户是否置顶（含大厅强制）
+	PinForced   bool        `json:"pin_forced"`     // 大厅强制置顶，不可取消
 	Peer        *model.User `json:"peer,omitempty"` // 私聊对方（仅 direct）
 }
 
@@ -114,6 +114,15 @@ func (s *ChatService) membership(tx *gorm.DB, roomID, userID uint) (*model.ChatR
 	if err != nil {
 		return nil, err
 	}
+	// 过期禁言自动解除：惰性清理，不依赖定时任务
+	if m.Muted && m.MutedUntil != nil && m.MutedUntil.Before(time.Now()) {
+		m.Muted = false
+		m.MutedUntil = nil
+		_ = tx.Model(&model.ChatRoomMember{}).
+			Where("room_id = ? AND user_id = ?", roomID, userID).
+			Select("muted", "muted_until").
+			Updates(map[string]interface{}{"muted": false, "muted_until": nil}).Error
+	}
 	return &m, nil
 }
 
@@ -122,7 +131,7 @@ func (s *ChatService) Membership(roomID, userID uint) (*model.ChatRoomMember, er
 	return s.membership(s.db, roomID, userID)
 }
 
-// unreadCounts 批量计算访问者在给定群集合中的未读数（消息 ID 大于已读水位、且排除本人发送）
+// unreadCounts 批量计算访问者在给定群集合中的未读数（消息 ID 大于已读水位、且排除本人发送与系统提示）
 func (s *ChatService) unreadCounts(userID uint, roomIDs []uint) map[uint]int64 {
 	out := make(map[uint]int64)
 	if userID == 0 || len(roomIDs) == 0 {
@@ -132,7 +141,7 @@ func (s *ChatService) unreadCounts(userID uint, roomIDs []uint) map[uint]int64 {
 	s.db.Table("chat_messages AS m").
 		Select("m.room_id AS room_id, count(*) AS cnt").
 		Joins("JOIN chat_room_members AS rm ON rm.room_id = m.room_id AND rm.user_id = ?", userID).
-		Where("m.room_id IN ? AND m.id > rm.last_read_message_id AND m.sender_id <> ? AND m.deleted_at IS NULL AND m.recalled_at IS NULL", roomIDs, userID).
+		Where("m.room_id IN ? AND m.id > rm.last_read_message_id AND m.sender_id <> ? AND m.deleted_at IS NULL AND m.recalled_at IS NULL AND m.is_system = ?", roomIDs, userID, false).
 		Group("m.room_id").
 		Scan(&rows)
 	for _, r := range rows {
@@ -758,44 +767,84 @@ func (s *ChatService) Kick(operatorID, roomID, targetID uint, oversee bool) erro
 	return s.removeMember(roomID, targetID)
 }
 
-// SetMemberMute 禁言/解禁：群主、群管、全站监管；不可禁言群主或站点站长账号
-func (s *ChatService) SetMemberMute(operatorID, roomID, targetID uint, muted, oversee bool) error {
+// SendSystemMessage 向房间落库一条系统提示消息（sender_id=0，is_system=true）。
+// 只推进房间 updated_at，不推进 last_message_id：系统提示不作为会话预览，
+// 也不参与排序顶置，避免禁言/解禁等管理动作在会话列表伪装成「新消息」。
+// 失败返回 nil + error。
+func (s *ChatService) SendSystemMessage(roomID uint, content string) (*model.ChatMessage, error) {
+	msg := &model.ChatMessage{
+		RoomID:    roomID,
+		SenderID:  0,
+		Content:   content,
+		IsSystem:  true,
+		CreatedAt: time.Now(),
+	}
+	err := s.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Create(msg).Error; err != nil {
+			return err
+		}
+		return tx.Model(&model.ChatRoom{}).Where("id = ?", roomID).
+			Update("updated_at", time.Now()).Error
+	})
+	if err != nil {
+		return nil, err
+	}
+	return msg, nil
+}
+
+// SetMemberMute 禁言/解禁：群主、群管、全站监管；不可禁言群主或站点站长账号。
+// duration 为禁言时长；0 表示永久禁言；muted=false 时忽略 duration 并清空 muted_until。
+// 返回目标用户昵称（供广播系统提示使用）。
+func (s *ChatService) SetMemberMute(operatorID, roomID, targetID uint, muted bool, duration time.Duration, oversee bool) (string, error) {
 	room, err := s.getRoom(roomID)
 	if err != nil {
-		return err
+		return "", err
 	}
 	if room.RoomType == model.ChatRoomTypeDirect {
-		return ErrChatOwnerOnly
+		return "", ErrChatOwnerOnly
 	}
 	target, err := s.membership(s.db, roomID, targetID)
 	if err != nil {
-		return err
+		return "", err
 	}
 	if target.Role == model.ChatRoleOwner {
-		return ErrChatCannotMuteOwner
+		return "", ErrChatCannotMuteOwner
 	}
 	var targetUser model.User
-	if err := s.db.Select("role").First(&targetUser, targetID).Error; err != nil {
-		return ErrChatUserGone
+	if err := s.db.Select("role", "nickname", "username").First(&targetUser, targetID).Error; err != nil {
+		return "", ErrChatUserGone
 	}
 	if targetUser.Role == model.RoleOwner {
-		return ErrChatCannotMuteOwner
+		return "", ErrChatCannotMuteOwner
 	}
 	if !oversee {
 		op, err := s.membership(s.db, roomID, operatorID)
 		if err != nil {
-			return err
+			return "", err
 		}
 		if op.Role != model.ChatRoleOwner && op.Role != model.ChatRoleAdmin {
-			return ErrChatMuteDenied
+			return "", ErrChatMuteDenied
 		}
 		if target.Role == model.ChatRoleAdmin && op.Role != model.ChatRoleOwner {
-			return ErrChatMuteDenied
+			return "", ErrChatMuteDenied
 		}
 	}
-	return s.db.Model(&model.ChatRoomMember{}).
+	var mutedUntil *time.Time
+	if muted && duration > 0 {
+		t := time.Now().Add(duration)
+		mutedUntil = &t
+	}
+	if err := s.db.Model(&model.ChatRoomMember{}).
 		Where("room_id = ? AND user_id = ?", roomID, targetID).
-		Select("muted").Update("muted", muted).Error
+		Select("muted", "muted_until").
+		Updates(map[string]interface{}{"muted": muted, "muted_until": mutedUntil}).Error; err != nil {
+		return "", err
+	}
+	targetName := targetUser.Nickname
+	if targetName == "" {
+		targetName = targetUser.Username
+	}
+	return targetName, nil
 }
 
 // SetMemberRole 仅站点站长可任命/撤销群管理员（admin <-> member）；不可改群主
@@ -970,7 +1019,7 @@ func (s *ChatService) SendMessage(senderID, roomID uint, content string, replyTo
 	if err != nil {
 		return nil, nil, err
 	}
-	if err := s.db.Preload("Sender").First(msg, msg.ID).Error; err != nil {
+	if err := s.db.Preload("Sender").Preload("Sender.Badges.Badge").First(msg, msg.ID).Error; err != nil {
 		return nil, nil, err
 	}
 	for _, uid := range mentionIDs {
@@ -1059,7 +1108,8 @@ func (s *ChatService) ListMessages(userID, roomID, beforeID uint, size int, over
 		q = q.Where("id < ?", beforeID)
 	}
 	var msgs []model.ChatMessage
-	if err := q.Order("id DESC").Limit(size + 1).Preload("Sender").Preload("Recaller").Find(&msgs).Error; err != nil {
+	// Sender.Badges.Badge 嵌套预加载：消息气泡需展示发送者等级与徽章（与成员列表一致）
+	if err := q.Order("id DESC").Limit(size + 1).Preload("Sender").Preload("Sender.Badges.Badge").Preload("Recaller").Find(&msgs).Error; err != nil {
 		return nil, false, err
 	}
 	hasMore := len(msgs) > size
@@ -1088,7 +1138,7 @@ func (s *ChatService) RecallMessage(operatorID, roomID, messageID uint, oversee
 		return nil, false, err
 	}
 	var msg model.ChatMessage
-	if err := s.db.Where("id = ? AND room_id = ?", messageID, roomID).First(&msg).Error; err != nil {
+	if err := s.db.Where("id = ? AND room_id = ?", messageID, roomID).Preload("Sender").First(&msg).Error; err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
 			return nil, false, ErrChatMsgNotFound
 		}
@@ -1097,6 +1147,10 @@ func (s *ChatService) RecallMessage(operatorID, roomID, messageID uint, oversee
 	if msg.RecalledAt != nil {
 		return &msg, false, nil // 幂等
 	}
+	// 站长的消息禁止群主/群管/站点消息管撤回（仅全站监管可撤回）
+	if msg.Sender.Role == model.RoleOwner && !oversee {
+		return nil, false, ErrChatRecallDenied
+	}
 	if msg.SenderID == operatorID {
 		if !oversee {
 			if _, err := s.membership(s.db, roomID, operatorID); err != nil {
@@ -1115,7 +1169,17 @@ func (s *ChatService) RecallMessage(operatorID, roomID, messageID uint, oversee
 	}
 	msg.RecalledAt = &now
 	msg.RecalledBy = operatorID
-	_ = s.db.Preload("Sender").Preload("Recaller").First(&msg, msg.ID)
+	// 撤回的是房间当前预览消息时，回退 last_message_id 到最近一条未撤回的非系统消息：
+	// 撤回不在会话列表留下「已撤回」预览，也不让房间因此停留在列表前排，避免被当成新消息提醒。
+	var prevID uint
+	_ = s.db.Model(&model.ChatMessage{}).
+		Where("room_id = ? AND deleted_at IS NULL AND recalled_at IS NULL AND is_system = ?", roomID, false).
+		Order("id DESC").Limit(1).
+		Select("id").Row().Scan(&prevID)
+	_ = s.db.Model(&model.ChatRoom{}).
+		Where("id = ? AND last_message_id = ?", roomID, msg.ID).
+		Update("last_message_id", prevID).Error
+	_ = s.db.Preload("Sender").Preload("Sender.Badges.Badge").Preload("Recaller").First(&msg, msg.ID)
 	return &msg, true, nil
 }
 
@@ -1295,13 +1359,13 @@ func (s *ChatService) MarkRead(userID, roomID, messageID uint) error {
 		Update("last_read_message_id", messageID).Error
 }
 
-// UnreadSummary 当前用户所有群的未读明细与总数
+// UnreadSummary 当前用户所有群的未读明细与总数（系统提示消息不计入）
 func (s *ChatService) UnreadSummary(userID uint) (int64, []UnreadRoom, error) {
 	var rows []UnreadRoom
 	err := s.db.Table("chat_messages AS m").
 		Select("m.room_id AS room_id, count(*) AS cnt").
 		Joins("JOIN chat_room_members AS rm ON rm.room_id = m.room_id AND rm.user_id = ?", userID).
-		Where("m.id > rm.last_read_message_id AND m.sender_id <> ? AND m.deleted_at IS NULL AND m.recalled_at IS NULL", userID).
+		Where("m.id > rm.last_read_message_id AND m.sender_id <> ? AND m.deleted_at IS NULL AND m.recalled_at IS NULL AND m.is_system = ?", userID, false).
 		Group("m.room_id").
 		Scan(&rows).Error
 	if err != nil {

backend/service/comment.go

@@ -44,7 +44,7 @@ func IsNecroReply(lastReplyAt time.Time, afterHours int, now time.Time) bool {
 
 // CommentService 评论服务
 type CommentService struct {
-	db *gorm.DB
+	db      *gorm.DB
 	setting *SettingService
 }
 
@@ -297,6 +297,80 @@ func (s *CommentService) FloorNumber(postID, commentID uint) int {
 	return FloorNumber(s.db, postID, commentID)
 }
 
+// CommentAnchor 评论在所属帖子内的相对锚点：
+// Floor=楼层号（含软删/待审占位，口径同 FloorNumber）；IsRoot=true 为主楼，
+// false 为楼中楼（锚点需附带评论 ID 才能精确定位具体回复）。
+type CommentAnchor struct {
+	Floor  uint `json:"floor"`
+	IsRoot bool `json:"is_root"`
+}
+
+// CommentAnchors 批量查询评论锚点（两条 SQL，避免逐行 N+1）；
+// 评论或其主楼已不存在（如整串被彻底删除）时不出现在结果中。
+func CommentAnchors(db *gorm.DB, ids []uint) map[uint]CommentAnchor {
+	out := make(map[uint]CommentAnchor, len(ids))
+	if db == nil || len(ids) == 0 {
+		return out
+	}
+	// Unscoped：软删/待审评论仍占楼层，与 FloorNumber 同口径
+	var targets []model.Comment
+	if err := db.Unscoped().
+		Select("id", "post_id", "parent_id", "root_id", "created_at").
+		Where("id IN ?", ids).Find(&targets).Error; err != nil {
+		return out
+	}
+	rootIDSet := make(map[uint]struct{}, len(targets))
+	for _, c := range targets {
+		rid := c.ID
+		if c.ParentID != nil && c.RootID != nil {
+			rid = *c.RootID
+		}
+		rootIDSet[rid] = struct{}{}
+	}
+	rootIDs := make([]uint, 0, len(rootIDSet))
+	for rid := range rootIDSet {
+		rootIDs = append(rootIDs, rid)
+	}
+	// 每个主楼之前（按 created_at/id 升序）的主楼数即楼层号 - 1
+	type aheadRow struct {
+		RootID uint
+		Ahead  int64
+	}
+	var aheadRows []aheadRow
+	if err := db.Unscoped().Table("comments AS f").
+		Select(`f.id AS root_id,
+			(SELECT COUNT(*) FROM comments c
+			 WHERE c.post_id = f.post_id AND c.parent_id IS NULL
+			   AND (c.created_at < f.created_at
+			        OR (c.created_at = f.created_at AND c.id < f.id))) AS ahead`).
+		Where("f.id IN ? AND f.parent_id IS NULL", rootIDs).
+		Scan(&aheadRows).Error; err != nil {
+		return out
+	}
+	floorByRoot := make(map[uint]uint, len(aheadRows))
+	for _, r := range aheadRows {
+		floorByRoot[r.RootID] = uint(r.Ahead) + 1
+	}
+	for _, c := range targets {
+		isRoot := c.ParentID == nil
+		rid := c.ID
+		if !isRoot && c.RootID != nil {
+			rid = *c.RootID
+		}
+		floor := floorByRoot[rid]
+		if floor == 0 {
+			continue
+		}
+		out[c.ID] = CommentAnchor{Floor: floor, IsRoot: isRoot}
+	}
+	return out
+}
+
+// AnchorsByCommentIDs 见包级 CommentAnchors
+func (s *CommentService) AnchorsByCommentIDs(ids []uint) map[uint]CommentAnchor {
+	return CommentAnchors(s.db, ids)
+}
+
 // applyCommentListVisibility 评论流可见性：published，或 pending 且（作者 / 该板可审）；
 // 软删行：已发布的对所有人占位；待审软删仅作者/可审者可见占位。
 func applyCommentListVisibility(db *gorm.DB, boardID, viewerID uint, actor *Actor) *gorm.DB {
@@ -442,6 +516,8 @@ type UserCommentItem struct {
 	PostID    uint      `json:"post_id"`
 	PostTitle string    `json:"post_title"`
 	Content   string    `json:"content"`
+	Floor     uint      `json:"floor"`   // 所属楼层相对序号（主楼为自身楼层）
+	IsRoot    bool      `json:"is_root"` // 主楼/楼中楼，供前端拼 #comment-{floor}[-r{id}]
 	CreatedAt time.Time `json:"created_at"`
 }
 
@@ -470,6 +546,17 @@ func (s *CommentService) ListByUser(userID uint, page, size int) ([]UserCommentI
 	if items == nil {
 		items = []UserCommentItem{}
 	}
+	ids := make([]uint, 0, len(items))
+	for _, it := range items {
+		ids = append(ids, it.ID)
+	}
+	anchors := s.AnchorsByCommentIDs(ids)
+	for i := range items {
+		if a, ok := anchors[items[i].ID]; ok {
+			items[i].Floor = a.Floor
+			items[i].IsRoot = a.IsRoot
+		}
+	}
 	return items, total, nil
 }
 

backend/service/follow.go

@@ -9,7 +9,7 @@ import (
 
 // FollowService 关注服务（仅用户；关注时给对方发通知）
 type FollowService struct {
-	db   *gorm.DB
+	db    *gorm.DB
 	notif *NotificationService
 }
 

backend/service/friendlink.go

@@ -0,0 +1,305 @@
+package service
+
+import (
+	"errors"
+	"net/url"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"gorm.io/gorm"
+)
+
+// 友情链接状态
+const (
+	FriendLinkStatusPending  = "pending"
+	FriendLinkStatusApproved = "approved"
+	FriendLinkStatusRejected = "rejected"
+)
+
+// 字段长度上限
+const (
+	friendLinkMaxName        = 64
+	friendLinkMaxURL         = 512
+	friendLinkMaxDescription = 255
+	friendLinkMaxLogoURL     = 512
+	friendLinkMaxCategory    = 32
+	friendLinkMaxReciprocal  = 512
+	friendLinkMaxReject      = 255
+)
+
+var (
+	// ErrFriendLinkInvalid 参数校验失败
+	ErrFriendLinkInvalid = errors.New("友情链接参数无效")
+	// ErrFriendLinkNotFound 记录不存在
+	ErrFriendLinkNotFound = errors.New("友情链接不存在")
+)
+
+// FriendLinkInput 申请/新建/更新共用入参（指针区分「未传」与「显式清空」由调用方决定）
+type FriendLinkInput struct {
+	Name          string `json:"name"`
+	URL           string `json:"url"`
+	Description   string `json:"description"`
+	LogoURL       string `json:"logo_url"`
+	Category      string `json:"category"`
+	ReciprocalURL string `json:"reciprocal_url"`
+}
+
+// FriendLinkService 友情链接申请 + 后台 CRUD/审批
+type FriendLinkService struct {
+	db *gorm.DB
+}
+
+func NewFriendLinkService(db *gorm.DB) *FriendLinkService {
+	return &FriendLinkService{db: db}
+}
+
+// validateInput 校验并归一化入参；返回归一化后的值
+func validateFriendLinkInput(in FriendLinkInput) (FriendLinkInput, error) {
+	name := strings.TrimSpace(in.Name)
+	if name == "" || utf8.RuneCountInString(name) > friendLinkMaxName {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	rawURL := strings.TrimSpace(in.URL)
+	if rawURL == "" || len(rawURL) > friendLinkMaxURL {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	if u, err := url.Parse(rawURL); err != nil || u.Scheme == "" || u.Host == "" ||
+		(u.Scheme != "http" && u.Scheme != "https") {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	desc := strings.TrimSpace(in.Description)
+	if utf8.RuneCountInString(desc) > friendLinkMaxDescription {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	logo := strings.TrimSpace(in.LogoURL)
+	if len(logo) > friendLinkMaxLogoURL {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	if logo != "" {
+		if u, err := url.Parse(logo); err != nil || u.Scheme == "" || u.Host == "" ||
+			(u.Scheme != "http" && u.Scheme != "https") {
+			return FriendLinkInput{}, ErrFriendLinkInvalid
+		}
+	}
+	category := strings.TrimSpace(in.Category)
+	if utf8.RuneCountInString(category) > friendLinkMaxCategory {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	reciprocal := strings.TrimSpace(in.ReciprocalURL)
+	if len(reciprocal) > friendLinkMaxReciprocal {
+		return FriendLinkInput{}, ErrFriendLinkInvalid
+	}
+	if reciprocal != "" {
+		if u, err := url.Parse(reciprocal); err != nil || u.Scheme == "" || u.Host == "" ||
+			(u.Scheme != "http" && u.Scheme != "https") {
+			return FriendLinkInput{}, ErrFriendLinkInvalid
+		}
+	}
+	return FriendLinkInput{
+		Name: name, URL: rawURL, Description: desc, LogoURL: logo,
+		Category: category, ReciprocalURL: reciprocal,
+	}, nil
+}
+
+// ListApproved 前台公开列表：仅 approved，按 sort_order ASC, id ASC
+func (s *FriendLinkService) ListApproved() ([]model.FriendLink, error) {
+	var list []model.FriendLink
+	err := s.db.Where("status = ?", FriendLinkStatusApproved).
+		Order("sort_order ASC, id ASC").Find(&list).Error
+	if list == nil {
+		list = []model.FriendLink{}
+	}
+	return list, err
+}
+
+// ListAll 后台全量列表（含 pending/rejected），按 status, sort_order, id
+func (s *FriendLinkService) ListAll() ([]model.FriendLink, error) {
+	var list []model.FriendLink
+	err := s.db.Order("status ASC, sort_order ASC, id ASC").Find(&list).Error
+	if list == nil {
+		list = []model.FriendLink{}
+	}
+	return list, err
+}
+
+// ListMine 申请人本人提交的全部申请（含待审/拒绝），按提交时间倒序
+func (s *FriendLinkService) ListMine(userID uint) ([]model.FriendLink, error) {
+	var list []model.FriendLink
+	err := s.db.Where("applicant_user_id = ?", userID).
+		Order("created_at DESC, id DESC").Find(&list).Error
+	if list == nil {
+		list = []model.FriendLink{}
+	}
+	return list, err
+}
+
+// OwnerUpdate 申请人修改自己的申请（名称/链接/回链/LOGO）；非待审状态的记录修改后回退待审
+func (s *FriendLinkService) OwnerUpdate(id, userID uint, in FriendLinkInput) error {
+	norm, err := validateFriendLinkInput(in)
+	if err != nil {
+		return err
+	}
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		var fl model.FriendLink
+		if err := tx.First(&fl, id).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return ErrFriendLinkNotFound
+			}
+			return err
+		}
+		// 仅申请人本人可改；他人访问统一按不存在处理，不暴露记录存在性
+		if fl.ApplicantUserID == nil || *fl.ApplicantUserID != userID {
+			return ErrFriendLinkNotFound
+		}
+		updates := map[string]interface{}{
+			"name":           norm.Name,
+			"url":            norm.URL,
+			"logo_url":       norm.LogoURL,
+			"reciprocal_url": norm.ReciprocalURL,
+			"updated_at":     time.Now(),
+		}
+		if fl.Status != FriendLinkStatusPending {
+			updates["status"] = FriendLinkStatusPending
+			updates["reject_reason"] = ""
+		}
+		return tx.Model(&fl).Updates(updates).Error
+	})
+}
+
+// nextSortOrder 取当前 approved 记录中最大 sort_order + 1（新建/审批通过时使用）
+func (s *FriendLinkService) nextSortOrder() (int, error) {
+	var maxOrder int
+	err := s.db.Model(&model.FriendLink{}).
+		Where("status = ?", FriendLinkStatusApproved).
+		Select("COALESCE(MAX(sort_order), 0)").Row().Scan(&maxOrder)
+	if err != nil {
+		return 0, err
+	}
+	return maxOrder + 1, nil
+}
+
+// Apply 用户申请：status=pending
+func (s *FriendLinkService) Apply(in FriendLinkInput, applicantUserID uint) (*model.FriendLink, error) {
+	norm, err := validateFriendLinkInput(in)
+	if err != nil {
+		return nil, err
+	}
+	uid := applicantUserID
+	now := time.Now()
+	fl := &model.FriendLink{
+		Name: norm.Name, URL: norm.URL, Description: norm.Description, LogoURL: norm.LogoURL,
+		Category: norm.Category, ReciprocalURL: norm.ReciprocalURL,
+		Status: FriendLinkStatusPending, SortOrder: 0,
+		ApplicantUserID: &uid, CreatedAt: now, UpdatedAt: now,
+	}
+	if err := s.db.Create(fl).Error; err != nil {
+		return nil, err
+	}
+	return fl, nil
+}
+
+// AdminCreate 站长直接新建：status=approved，自动分配 sort_order
+func (s *FriendLinkService) AdminCreate(in FriendLinkInput) (*model.FriendLink, error) {
+	norm, err := validateFriendLinkInput(in)
+	if err != nil {
+		return nil, err
+	}
+	order, err := s.nextSortOrder()
+	if err != nil {
+		return nil, err
+	}
+	now := time.Now()
+	fl := &model.FriendLink{
+		Name: norm.Name, URL: norm.URL, Description: norm.Description, LogoURL: norm.LogoURL,
+		Category: norm.Category, ReciprocalURL: norm.ReciprocalURL,
+		Status: FriendLinkStatusApproved, SortOrder: order,
+		CreatedAt: now, UpdatedAt: now,
+	}
+	if err := s.db.Create(fl).Error; err != nil {
+		return nil, err
+	}
+	return fl, nil
+}
+
+// AdminUpdate 全量更新内容（不改 status/sort_order/applicant）
+func (s *FriendLinkService) AdminUpdate(id uint, in FriendLinkInput) error {
+	norm, err := validateFriendLinkInput(in)
+	if err != nil {
+		return err
+	}
+	res := s.db.Model(&model.FriendLink{}).Where("id = ?", id).
+		Updates(map[string]interface{}{
+			"name":           norm.Name,
+			"url":            norm.URL,
+			"description":    norm.Description,
+			"logo_url":       norm.LogoURL,
+			"category":       norm.Category,
+			"reciprocal_url": norm.ReciprocalURL,
+			"updated_at":     time.Now(),
+		})
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrFriendLinkNotFound
+	}
+	return nil
+}
+
+// AdminSetStatus 审批：approved 时自动补 sort_order；rejected 时写 reject_reason
+func (s *FriendLinkService) AdminSetStatus(id uint, status, rejectReason string) error {
+	status = strings.TrimSpace(status)
+	if status != FriendLinkStatusApproved && status != FriendLinkStatusRejected &&
+		status != FriendLinkStatusPending {
+		return ErrFriendLinkInvalid
+	}
+	if status == FriendLinkStatusRejected && utf8.RuneCountInString(rejectReason) > friendLinkMaxReject {
+		return ErrFriendLinkInvalid
+	}
+
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		var fl model.FriendLink
+		if err := tx.First(&fl, id).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return ErrFriendLinkNotFound
+			}
+			return err
+		}
+		updates := map[string]interface{}{
+			"status":        status,
+			"updated_at":    time.Now(),
+			"reject_reason": "",
+		}
+		switch status {
+		case FriendLinkStatusApproved:
+			if fl.SortOrder == 0 {
+				var maxOrder int
+				if err := tx.Model(&model.FriendLink{}).
+					Where("status = ? AND id <> ?", FriendLinkStatusApproved, id).
+					Select("COALESCE(MAX(sort_order), 0)").Row().Scan(&maxOrder); err != nil {
+					return err
+				}
+				updates["sort_order"] = maxOrder + 1
+			}
+		case FriendLinkStatusRejected:
+			updates["reject_reason"] = rejectReason
+		case FriendLinkStatusPending:
+			// 切回 pending 视为下线，不动 sort_order
+		}
+		return tx.Model(&fl).Updates(updates).Error
+	})
+}
+
+// AdminDelete 软删除
+func (s *FriendLinkService) AdminDelete(id uint) error {
+	res := s.db.Delete(&model.FriendLink{}, id)
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrFriendLinkNotFound
+	}
+	return nil
+}

backend/service/header_nav.go

@@ -0,0 +1,191 @@
+package service
+
+import (
+	"encoding/json"
+	"strings"
+	"unicode/utf8"
+)
+
+// 桌面端 Header 主导航（品牌名右侧的菜单）。
+// 配置为有序数组，元素顺序即展示顺序；内置项只存 key（文案/图标/地址由前端注册表派生，
+// 支持伪静态风格），自定义项存文案与地址。后续新增内置页面只需在前后端白名单各注册一项。
+const (
+	// SettingKeyHeaderNav 缺行/非法=内置默认三项；显式空数组 [] 表示全部隐藏
+	SettingKeyHeaderNav = "header_nav"
+
+	HeaderNavItemBuiltin = "builtin"
+	HeaderNavItemCustom  = "custom"
+
+	// MaxHeaderNavItems 菜单项总数上限（内置 + 自定义）
+	MaxHeaderNavItems = 8
+	// MaxHeaderNavLabelRunes 自定义菜单文案长度上限
+	MaxHeaderNavLabelRunes = 16
+)
+
+// HeaderNavBuiltinKeys 内置菜单 key 白名单（顺序即默认顺序）；
+// 与前端 lib/headerNav.ts 的 HEADER_NAV_BUILTIN_KEYS 保持一致。
+var HeaderNavBuiltinKeys = []string{"home", "leaderboard", "library"}
+
+// HeaderNavItem 顶部导航菜单项：
+//
+//	builtin：Key 取白名单，Label/URL 留空，地址与高亮由前端按 key 派生；
+//	custom：管理员自定义，Label 必填，URL 为站内路径或 http(s) 外链，NewTab 控制打开方式。
+type HeaderNavItem struct {
+	Type   string `json:"type"`
+	Key    string `json:"key,omitempty"`
+	Label  string `json:"label,omitempty"`
+	URL    string `json:"url,omitempty"`
+	NewTab bool   `json:"new_tab,omitempty"`
+}
+
+// DefaultHeaderNav 内置默认三项（缺行时回落）
+func DefaultHeaderNav() []HeaderNavItem {
+	out := make([]HeaderNavItem, 0, len(HeaderNavBuiltinKeys))
+	for _, k := range HeaderNavBuiltinKeys {
+		out = append(out, HeaderNavItem{Type: HeaderNavItemBuiltin, Key: k})
+	}
+	return out
+}
+
+func headerNavBuiltinAllowed(k string) bool {
+	for _, valid := range HeaderNavBuiltinKeys {
+		if k == valid {
+			return true
+		}
+	}
+	return false
+}
+
+// headerNavItemIn 持久化读取用：NewTab 用指针区分「未指定（外链默认新开）」与显式 false
+type headerNavItemIn struct {
+	Type   string `json:"type"`
+	Key    string `json:"key"`
+	Label  string `json:"label"`
+	URL    string `json:"url"`
+	NewTab *bool  `json:"new_tab"`
+}
+
+// NormalizeHeaderNav 保存前严格校验：类型/内置 key 非法、自定义文案或地址非法直接报错；
+// 内置项重复去重（首次出现为准，与 mobile_tabs 一致）
+func NormalizeHeaderNav(raw []HeaderNavItem) ([]HeaderNavItem, error) {
+	if len(raw) > MaxHeaderNavItems {
+		return nil, ErrInvalidSiteSetting
+	}
+	out := make([]HeaderNavItem, 0, len(raw))
+	seenBuiltin := make(map[string]struct{}, len(raw))
+	for _, item := range raw {
+		switch strings.TrimSpace(item.Type) {
+		case HeaderNavItemBuiltin:
+			k := strings.TrimSpace(strings.ToLower(item.Key))
+			if !headerNavBuiltinAllowed(k) {
+				return nil, ErrInvalidSiteSetting
+			}
+			if _, dup := seenBuiltin[k]; dup {
+				continue
+			}
+			seenBuiltin[k] = struct{}{}
+			out = append(out, HeaderNavItem{Type: HeaderNavItemBuiltin, Key: k})
+		case HeaderNavItemCustom:
+			label := strings.TrimSpace(item.Label)
+			if label == "" || utf8.RuneCountInString(label) > MaxHeaderNavLabelRunes {
+				return nil, ErrInvalidSiteSetting
+			}
+			u, ok := NormalizeFooterURL(item.URL)
+			if !ok {
+				return nil, ErrInvalidSiteSetting
+			}
+			out = append(out, HeaderNavItem{
+				Type:   HeaderNavItemCustom,
+				Label:  label,
+				URL:    u,
+				NewTab: item.NewTab,
+			})
+		default:
+			return nil, ErrInvalidSiteSetting
+		}
+	}
+	return out, nil
+}
+
+// parseHeaderNavJSON 读取时宽容：坏 JSON 回落默认；单条非法跳过；内置重复跳过；
+// 显式空数组解析为空切片（全部隐藏），由调用方与「缺行」区分
+func parseHeaderNavJSON(raw string) []HeaderNavItem {
+	var in []headerNavItemIn
+	if err := json.Unmarshal([]byte(raw), &in); err != nil {
+		return DefaultHeaderNav()
+	}
+	out := make([]HeaderNavItem, 0, len(in))
+	seenBuiltin := make(map[string]struct{}, len(in))
+	for _, item := range in {
+		switch strings.TrimSpace(item.Type) {
+		case HeaderNavItemBuiltin:
+			k := strings.TrimSpace(strings.ToLower(item.Key))
+			if !headerNavBuiltinAllowed(k) {
+				continue
+			}
+			if _, dup := seenBuiltin[k]; dup {
+				continue
+			}
+			seenBuiltin[k] = struct{}{}
+			out = append(out, HeaderNavItem{Type: HeaderNavItemBuiltin, Key: k})
+		case HeaderNavItemCustom:
+			label := strings.TrimSpace(item.Label)
+			if label == "" || utf8.RuneCountInString(label) > MaxHeaderNavLabelRunes {
+				continue
+			}
+			u, ok := NormalizeFooterURL(item.URL)
+			if !ok {
+				continue
+			}
+			newTab := false
+			if item.NewTab != nil {
+				newTab = *item.NewTab
+			} else if isExternalFooterURL(u) {
+				newTab = true
+			}
+			out = append(out, HeaderNavItem{Type: HeaderNavItemCustom, Label: label, URL: u, NewTab: newTab})
+		}
+		if len(out) >= MaxHeaderNavItems {
+			break
+		}
+	}
+	return out
+}
+
+func headerNavEqual(a, b []HeaderNavItem) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// HeaderNav 读取顶部导航配置；缺行/非法回落默认三项，显式 [] 返回空切片
+func (s *SettingService) HeaderNav() []HeaderNavItem {
+	v, found, err := s.getValue(SettingKeyHeaderNav)
+	if err != nil || !found || strings.TrimSpace(v) == "" {
+		return DefaultHeaderNav()
+	}
+	return parseHeaderNavJSON(v)
+}
+
+// SetHeaderNav 校验并保存顶部导航配置；与默认三项完全一致时删键保持「缺行=默认」语义，
+// 空数组原样写入（表示全部隐藏）
+func (s *SettingService) SetHeaderNav(items []HeaderNavItem) error {
+	out, err := NormalizeHeaderNav(items)
+	if err != nil {
+		return err
+	}
+	if headerNavEqual(out, DefaultHeaderNav()) {
+		return s.deleteKey(SettingKeyHeaderNav)
+	}
+	b, err := json.Marshal(out)
+	if err != nil {
+		return err
+	}
+	return s.putValue(SettingKeyHeaderNav, string(b))
+}

backend/service/header_nav_test.go

@@ -0,0 +1,164 @@
+package service
+
+import (
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func newHeaderNavTestService(t *testing.T) *SettingService {
+	t.Helper()
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.SiteSetting{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	return NewSettingService(db)
+}
+
+func TestHeaderNavDefaultWhenMissing(t *testing.T) {
+	s := newHeaderNavTestService(t)
+	got := s.HeaderNav()
+	if len(got) != 3 ||
+		got[0] != (HeaderNavItem{Type: HeaderNavItemBuiltin, Key: "home"}) ||
+		got[1] != (HeaderNavItem{Type: HeaderNavItemBuiltin, Key: "leaderboard"}) ||
+		got[2] != (HeaderNavItem{Type: HeaderNavItemBuiltin, Key: "library"}) {
+		t.Fatalf("missing row should fall back to builtin defaults, got %+v", got)
+	}
+	pub, err := s.Public()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(pub.HeaderNav) != 3 {
+		t.Fatalf("Public().HeaderNav len = %d, want 3", len(pub.HeaderNav))
+	}
+}
+
+func TestSetHeaderNavRoundTrip(t *testing.T) {
+	s := newHeaderNavTestService(t)
+	want := []HeaderNavItem{
+		{Type: HeaderNavItemBuiltin, Key: "library"},
+		{Type: HeaderNavItemCustom, Label: "关于", URL: "/p/about", NewTab: false},
+		{Type: HeaderNavItemBuiltin, Key: "home"},
+		{Type: HeaderNavItemCustom, Label: "官网", URL: "https://example.com", NewTab: true},
+	}
+	if err := s.SetHeaderNav(want); err != nil {
+		t.Fatal(err)
+	}
+	got := s.HeaderNav()
+	if len(got) != len(want) {
+		t.Fatalf("len = %d, want %d (%+v)", len(got), len(want), got)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("item %d = %+v, want %+v", i, got[i], want[i])
+		}
+	}
+}
+
+func TestSetHeaderNavEmptyHidesAll(t *testing.T) {
+	s := newHeaderNavTestService(t)
+	if err := s.SetHeaderNav(nil); err != nil {
+		t.Fatal(err)
+	}
+	if got := s.HeaderNav(); len(got) != 0 {
+		t.Fatalf("explicit empty list should hide all menus, got %+v", got)
+	}
+	var rows int64
+	s.db.Where("key = ?", SettingKeyHeaderNav).Model(&model.SiteSetting{}).Count(&rows)
+	if rows != 1 {
+		t.Fatalf("empty list should be persisted, rows=%d", rows)
+	}
+}
+
+func TestSetHeaderNavDefaultDeletesKey(t *testing.T) {
+	s := newHeaderNavTestService(t)
+	if err := s.SetHeaderNav([]HeaderNavItem{{Type: HeaderNavItemCustom, Label: "x", URL: "/x"}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.SetHeaderNav(DefaultHeaderNav()); err != nil {
+		t.Fatal(err)
+	}
+	var rows int64
+	s.db.Where("key = ?", SettingKeyHeaderNav).Model(&model.SiteSetting{}).Count(&rows)
+	if rows != 0 {
+		t.Fatalf("default config should delete the row, rows=%d", rows)
+	}
+}
+
+func TestNormalizeHeaderNavRejectsInvalid(t *testing.T) {
+	longLabel := strings.Repeat("字", MaxHeaderNavLabelRunes+1)
+	cases := [][]HeaderNavItem{
+		{{Type: HeaderNavItemBuiltin, Key: "unknown"}},
+		{{Type: "weird", Key: "home"}},
+		{{Type: HeaderNavItemCustom, Label: "", URL: "/x"}},
+		{{Type: HeaderNavItemCustom, Label: longLabel, URL: "/x"}},
+		{{Type: HeaderNavItemCustom, Label: "x", URL: "javascript:alert(1)"}},
+		{{Type: HeaderNavItemCustom, Label: "x", URL: "relative"}},
+		{{Type: HeaderNavItemCustom, Label: "x", URL: "//evil.com/x"}},
+	}
+	for i, items := range cases {
+		if _, err := NormalizeHeaderNav(items); !errors.Is(err, ErrInvalidSiteSetting) {
+			t.Fatalf("case %d should fail, got %v", i, err)
+		}
+	}
+	tooMany := make([]HeaderNavItem, MaxHeaderNavItems+1)
+	for i := range tooMany {
+		tooMany[i] = HeaderNavItem{Type: HeaderNavItemCustom, Label: "x", URL: "/x"}
+	}
+	if _, err := NormalizeHeaderNav(tooMany); !errors.Is(err, ErrInvalidSiteSetting) {
+		t.Fatalf("over-cap list should fail, got %v", err)
+	}
+}
+
+func TestNormalizeHeaderNavDedupesBuiltins(t *testing.T) {
+	got, err := NormalizeHeaderNav([]HeaderNavItem{
+		{Type: HeaderNavItemBuiltin, Key: "home"},
+		{Type: HeaderNavItemBuiltin, Key: " HOME "},
+		{Type: HeaderNavItemBuiltin, Key: "library"},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(got) != 2 || got[0].Key != "home" || got[1].Key != "library" {
+		t.Fatalf("builtin duplicates should be deduped, got %+v", got)
+	}
+}
+
+func TestParseHeaderNavJSONTolerant(t *testing.T) {
+	// 坏 JSON 回落默认
+	if got := parseHeaderNavJSON("{bad"); len(got) != 3 {
+		t.Fatalf("bad json should fall back to defaults, got %+v", got)
+	}
+	// 空数组 = 全部隐藏
+	if got := parseHeaderNavJSON("[]"); len(got) != 0 {
+		t.Fatalf("empty array should be respected, got %+v", got)
+	}
+	// 单条非法跳过；内置重复跳过；外链 new_tab 缺省为 true
+	got := parseHeaderNavJSON(`[
+		{"type":"builtin","key":"home"},
+		{"type":"builtin","key":"nope"},
+		{"type":"builtin","key":"home"},
+		{"type":"custom","label":"","url":"/x"},
+		{"type":"custom","label":"外链","url":"https://example.com"},
+		{"type":"custom","label":"站内","url":"/p/about","new_tab":true}
+	]`)
+	if len(got) != 3 {
+		t.Fatalf("want 3 valid items, got %+v", got)
+	}
+	if got[0] != (HeaderNavItem{Type: HeaderNavItemBuiltin, Key: "home"}) {
+		t.Fatalf("item0 = %+v", got[0])
+	}
+	if got[1].Type != HeaderNavItemCustom || got[1].Label != "外链" || !got[1].NewTab {
+		t.Fatalf("external custom item should default new_tab=true, got %+v", got[1])
+	}
+	if got[2].Label != "站内" || !got[2].NewTab {
+		t.Fatalf("explicit new_tab=true should be kept, got %+v", got[2])
+	}
+}

backend/service/hide_password_cookie.go

@@ -16,8 +16,8 @@ import (
 )
 
 const (
-	hidePwdCookiePrefix = "j13_hp_"
-	hidePwdCookieMaxAge = 30 * 24 * 3600 // 30 天
+	hidePwdCookiePrefix  = "j13_hp_"
+	hidePwdCookieMaxAge  = 30 * 24 * 3600 // 30 天
 	hidePwdCookieVersion = "1"
 )
 

backend/service/image_variants.go

@@ -0,0 +1,276 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha1"
+	"encoding/hex"
+	"errors"
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	webpenc "github.com/gen2brain/webp"
+	"golang.org/x/image/draw"
+	xwebp "golang.org/x/image/webp"
+)
+
+// 公开图片变体：GET /api/img?u=<源图URL>&w=<目标宽>
+// 按宽度白名单实时缩放为 WebP 并持久缓存到 .thumbs/v/，供全站 <img srcset> 消费。
+// 源内容不可变（上传文件名为随机哈希），变体 URL 可被浏览器/CDN 长期 immutable 缓存。
+// GIF/SVG/ICO 与「源宽 ≤ 请求宽」一律原样透传：保动效、保矢量、不放大。
+// 本地源按 mtime 失效；远程对象（/api/media/）ID 即内容，缓存永久有效。
+
+// VariantWebPQuality 变体 WebP 有损质量（与 MediaThumb 一致）
+const VariantWebPQuality = 78
+
+// variantWidths 宽度白名单（与前端 lib/responsiveImage.ts 同值，约 1.5x 步进）
+var variantWidths = []int{48, 96, 160, 256, 384, 512, 768, 1080, 1536, 1920}
+
+// IsVariantWidth 是否白名单精确值（非法尺寸 400，防止被刷任意尺寸）
+func IsVariantWidth(w int) bool {
+	for _, v := range variantWidths {
+		if v == w {
+			return true
+		}
+	}
+	return false
+}
+
+// variantGenLocks 并发生成去重：key=sha1(url).w → 每变体一把锁
+var variantGenLocks sync.Map
+
+// extMIME 扩展名 → MIME（含 SVG/ICO 透传类型）
+func extMIME(ext string) string {
+	switch ext {
+	case ".jpg", ".jpeg":
+		return "image/jpeg"
+	case ".png":
+		return "image/png"
+	case ".webp":
+		return "image/webp"
+	case ".gif":
+		return "image/gif"
+	case ".svg":
+		return "image/svg+xml"
+	case ".ico":
+		return "image/x-icon"
+	}
+	return ""
+}
+
+// variantCacheFile 变体缓存路径：.thumbs/v/<sha1(url)>.w<w>.webp
+func (s *UploadService) variantCacheFile(url string, w int) string {
+	sum := sha1.Sum([]byte(url))
+	name := hex.EncodeToString(sum[:]) + ".w" + strconv.Itoa(w) + ".webp"
+	return filepath.Join(s.dir, ".thumbs", "v", name)
+}
+
+// variantCacheFresh 缓存是否新鲜：本地源按 mtime；远程对象（modTime 零值）只看存在
+func variantCacheFresh(cache string, modTime time.Time) bool {
+	ti, err := os.Stat(cache)
+	if err != nil || ti.IsDir() {
+		return false
+	}
+	return modTime.IsZero() || !ti.ModTime().Before(modTime)
+}
+
+// Variant 返回源图指定宽度的变体字节与 MIME。
+func (s *UploadService) Variant(rawURL string, width int) ([]byte, string, error) {
+	rawURL = strings.TrimSpace(rawURL)
+	if len(rawURL) == 0 || len(rawURL) > 512 {
+		return nil, "", errors.New("无效地址")
+	}
+	if !IsVariantWidth(width) {
+		return nil, "", errors.New("不支持的尺寸")
+	}
+
+	var (
+		srcData []byte // 远程源预读字节（本地源在锁内读取）
+		srcMIME string
+		srcPath string // 本地源绝对路径
+		modTime time.Time
+		remote  bool
+		cache   = s.variantCacheFile(rawURL, width)
+	)
+
+	switch {
+	case strings.HasPrefix(rawURL, "/uploads/"):
+		rel := filepath.Clean(filepath.FromSlash(strings.TrimPrefix(rawURL, "/uploads/")))
+		if filepath.IsAbs(rel) || rel == "." || strings.HasPrefix(rel, "..") {
+			return nil, "", errors.New("无效地址")
+		}
+		dir := filepath.Dir(rel)
+		catOK := false
+		for _, cat := range mediaLibraryCategories {
+			if cat.Dir == dir {
+				catOK = true
+				break
+			}
+		}
+		if !catOK {
+			return nil, "", errors.New("无效地址")
+		}
+		ext := strings.ToLower(filepath.Ext(rel))
+		mime := extMIME(ext)
+		if mime == "" {
+			return nil, "", errors.New("非图片")
+		}
+		srcPath = filepath.Join(s.dir, rel)
+		info, err := os.Stat(srcPath)
+		if err != nil || info.IsDir() {
+			return nil, "", errors.New("文件不存在")
+		}
+		// 动图/矢量/图标：无法或无需光栅缩放，原样透传（不占变体缓存）
+		if ext == ".gif" || ext == ".svg" || ext == ".ico" {
+			data, err := os.ReadFile(srcPath)
+			return data, mime, err
+		}
+		srcMIME = mime
+		modTime = info.ModTime()
+
+	case strings.HasPrefix(rawURL, "/api/media/"):
+		if s.ops == nil {
+			return nil, "", errors.New("无效地址")
+		}
+		id := strings.TrimPrefix(rawURL, "/api/media/")
+		if id == "" || strings.ContainsAny(id, "/?#") || len(id) > 128 {
+			return nil, "", errors.New("无效地址")
+		}
+		remote = true
+		ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+		defer cancel()
+		r, mime, e := s.ops.OpenObject(ctx, id, true)
+		if e != nil {
+			return nil, "", errors.New("文件暂不可用")
+		}
+		defer r.Close()
+		switch mime {
+		case "image/jpeg", "image/png", "image/webp":
+		case "image/gif", "image/svg+xml", "image/x-icon", "image/vnd.microsoft.icon":
+			data, err := io.ReadAll(r)
+			return data, mime, err
+		default:
+			return nil, "", errors.New("非图片")
+		}
+		srcData, e = io.ReadAll(r)
+		if e != nil {
+			return nil, "", e
+		}
+		srcMIME = mime
+
+	default:
+		return nil, "", errors.New("无效地址")
+	}
+
+	// 快速路径：缓存已新鲜直接返回（无锁）
+	if variantCacheFresh(cache, modTime) {
+		if data, err := os.ReadFile(cache); err == nil {
+			return data, "image/webp", nil
+		}
+	}
+
+	// 并发生成去重：同 url+w 只生成一次
+	sum := sha1.Sum([]byte(rawURL))
+	key := hex.EncodeToString(sum[:]) + ".w" + strconv.Itoa(width)
+	mu, _ := variantGenLocks.LoadOrStore(key, &sync.Mutex{})
+	lk := mu.(*sync.Mutex)
+	lk.Lock()
+	defer lk.Unlock()
+
+	// double-check：等锁期间可能已由他人生成
+	if variantCacheFresh(cache, modTime) {
+		if data, err := os.ReadFile(cache); err == nil {
+			return data, "image/webp", nil
+		}
+	}
+
+	if !remote {
+		data, err := os.ReadFile(srcPath)
+		if err != nil {
+			return nil, "", err
+		}
+		srcData = data
+	}
+
+	out, m, err := variantFromBytes(srcData, srcMIME, width)
+	if err != nil {
+		return nil, "", err // 如动图 WebP，调用方回退原图
+	}
+	// 仅 WebP 变体积缓存（小图透传不落盘）；失败仅影响下次重复生成，不阻断响应
+	if m == "image/webp" {
+		_ = atomicWriteFile(cache, out)
+	}
+	return out, m, nil
+}
+
+// variantFromBytes 源字节 → 目标变体：解码失败报错（调用方回退原图）；
+// 源宽 ≤ 目标宽 → 原字节透传（不放大）；否则按目标宽等比缩放为 WebP。
+func variantFromBytes(srcData []byte, srcMIME string, width int) ([]byte, string, error) {
+	img, err := decodeImageBytes(srcData, srcMIME == "image/webp")
+	if err != nil {
+		return nil, "", err
+	}
+	b := img.Bounds()
+	if b.Dx() <= width {
+		return srcData, srcMIME, nil
+	}
+	nh := max(1, b.Dy()*width/b.Dx())
+	dst := scaleImage(img, width, nh)
+	out, err := encodeLossyWebP(dst, VariantWebPQuality)
+	if err != nil {
+		return nil, "", err
+	}
+	return out, "image/webp", nil
+}
+
+// ---------- 与 MediaThumb 共用的图片处理核心 ----------
+
+// decodeImageBytes 解码图片字节；WebP 走 x/image/webp 解码器
+func decodeImageBytes(data []byte, isWebP bool) (image.Image, error) {
+	if isWebP {
+		return xwebp.Decode(bytes.NewReader(data))
+	}
+	img, _, err := image.Decode(bytes.NewReader(data))
+	return img, err
+}
+
+// scaleImage CatmullRom 高质量缩放到指定宽高
+func scaleImage(img image.Image, nw, nh int) *image.RGBA {
+	dst := image.NewRGBA(image.Rect(0, 0, nw, nh))
+	draw.CatmullRom.Scale(dst, dst.Bounds(), img, img.Bounds(), draw.Src, nil)
+	return dst
+}
+
+// encodeLossyWebP 有损 WebP 编码
+func encodeLossyWebP(img image.Image, quality int) ([]byte, error) {
+	var buf bytes.Buffer
+	if err := webpenc.Encode(&buf, img, webpenc.Options{Quality: quality}); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+// atomicWriteFile 临时文件 + rename 原子落盘
+func atomicWriteFile(path string, data []byte) error {
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return err
+	}
+	tmp := path + ".partial"
+	if err := os.WriteFile(tmp, data, 0o644); err != nil {
+		return err
+	}
+	if err := os.Rename(tmp, path); err != nil {
+		_ = os.Remove(tmp)
+		return err
+	}
+	return nil
+}

backend/service/image_variants_test.go

@@ -0,0 +1,282 @@
+package service
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/freefire/jiang13-bbs/config"
+	webpenc "github.com/gen2brain/webp"
+	xwebp "golang.org/x/image/webp"
+)
+
+// solidImg 生成渐变纯色测试图
+func solidImg(w, h int) *image.RGBA {
+	src := image.NewRGBA(image.Rect(0, 0, w, h))
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			src.Set(x, y, color.RGBA{uint8(x % 256), uint8(y % 256), 128, 255})
+		}
+	}
+	return src
+}
+
+// writeVariantSource 把按编码器生成的文件写到 uploads 目录
+func writeVariantSource(t *testing.T, dir, url string, encode func(io.Writer) error) {
+	t.Helper()
+	abs := filepath.Join(dir, filepath.FromSlash(strings.TrimPrefix(url, "/uploads/")))
+	if err := os.MkdirAll(filepath.Dir(abs), 0o755); err != nil {
+		t.Fatalf("mkdir: %v", err)
+	}
+	f, err := os.Create(abs)
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	defer f.Close()
+	if err := encode(f); err != nil {
+		t.Fatalf("encode: %v", err)
+	}
+}
+
+func encodeJPEG(img image.Image) func(io.Writer) error {
+	return func(w io.Writer) error {
+		return jpeg.Encode(w, img, &jpeg.Options{Quality: 85})
+	}
+}
+
+func encodePNG(img image.Image) func(io.Writer) error {
+	return func(w io.Writer) error {
+		return png.Encode(w, img)
+	}
+}
+
+func encodeWebP(img image.Image) func(io.Writer) error {
+	return func(w io.Writer) error {
+		return webpenc.Encode(w, img, webpenc.Options{Quality: 85})
+	}
+}
+
+func encodeGIF(img image.Image) func(io.Writer) error {
+	return func(w io.Writer) error {
+		return gif.Encode(w, img, nil)
+	}
+}
+
+// decodeVariant 解码返回的 WebP 变体
+func decodeVariant(t *testing.T, data []byte) image.Image {
+	t.Helper()
+	img, err := xwebp.Decode(bytes.NewReader(data))
+	if err != nil {
+		t.Fatalf("decode variant webp: %v", err)
+	}
+	return img
+}
+
+func TestIsVariantWidth(t *testing.T) {
+	if !IsVariantWidth(48) || !IsVariantWidth(1920) {
+		t.Fatal("whitelist endpoints should be valid")
+	}
+	if IsVariantWidth(100) || IsVariantWidth(0) || IsVariantWidth(-48) {
+		t.Fatal("non-whitelist width should be invalid")
+	}
+}
+
+func TestVariantRejectsInvalidInput(t *testing.T) {
+	s, _ := newUploadTestService(t)
+
+	cases := []struct {
+		name string
+		url  string
+		w    int
+	}{
+		{"非法尺寸", "/uploads/images/a.webp", 100},
+		{"路径穿越", "/uploads/images/../../etc/passwd", 96},
+		{"非白名单目录", "/uploads/secret/a.webp", 96},
+		{"非图片扩展名", "/uploads/images/a.txt", 96},
+		{"外部地址", "https://evil.com/a.webp", 96},
+		{"空地址", "", 96},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if _, _, err := s.Variant(tc.url, tc.w); err == nil {
+				t.Fatal("want error, got nil")
+			}
+		})
+	}
+}
+
+func TestVariantMissingFile(t *testing.T) {
+	s, _ := newUploadTestService(t)
+	if _, _, err := s.Variant("/uploads/images/missing.webp", 96); err == nil {
+		t.Fatal("missing source should error")
+	}
+}
+
+func TestVariantPassthroughSmallImage(t *testing.T) {
+	s, dir := newUploadTestService(t)
+	url := "/uploads/images/small.webp"
+	writeVariantSource(t, dir, url, encodeWebP(solidImg(48, 48)))
+
+	data, m, err := s.Variant(url, 96)
+	if err != nil {
+		t.Fatalf("variant: %v", err)
+	}
+	if m != "image/webp" {
+		t.Fatalf("want webp mime, got %s", m)
+	}
+	src, _ := os.ReadFile(filepath.Join(dir, filepath.FromSlash("images/small.webp")))
+	if !bytes.Equal(data, src) {
+		t.Fatal("small image should be returned byte-for-byte")
+	}
+}
+
+func TestVariantResizesByWidthLandscape(t *testing.T) {
+	s, dir := newUploadTestService(t)
+	url := "/uploads/images/wide.jpg"
+	writeVariantSource(t, dir, url, encodeJPEG(solidImg(1000, 500)))
+
+	data, m, err := s.Variant(url, 384)
+	if err != nil {
+		t.Fatalf("variant: %v", err)
+	}
+	if m != "image/webp" {
+		t.Fatalf("want webp, got %s", m)
+	}
+	b := decodeVariant(t, data).Bounds()
+	if b.Dx() != 384 || b.Dy() != 192 {
+		t.Fatalf("want 384x192, got %dx%d", b.Dx(), b.Dy())
+	}
+}
+
+func TestVariantResizesByWidthPortrait(t *testing.T) {
+	s, dir := newUploadTestService(t)
+	url := "/uploads/images/tall.png"
+	writeVariantSource(t, dir, url, encodePNG(solidImg(500, 1000)))
+
+	data, _, err := s.Variant(url, 256)
+	if err != nil {
+		t.Fatalf("variant: %v", err)
+	}
+	b := decodeVariant(t, data).Bounds()
+	if b.Dx() != 256 || b.Dy() != 512 {
+		t.Fatalf("want 256x512, got %dx%d", b.Dx(), b.Dy())
+	}
+}
+
+func TestVariantPassthroughGIFSVGICO(t *testing.T) {
+	s, dir := newUploadTestService(t)
+
+	cases := []struct {
+		name string
+		url  string
+		mime string
+		body []byte
+	}{
+		{"gif", "/uploads/images/a.gif", "image/gif", nil},
+		{"svg", "/uploads/images/a.svg", "image/svg+xml", []byte("<svg xmlns=\"http://www.w3.org/2000/svg\"></svg>")},
+		{"ico", "/uploads/images/a.ico", "image/x-icon", []byte("\x00\x00\x01\x00")},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.body != nil {
+				writeVariantSource(t, dir, tc.url, func(w io.Writer) error {
+					_, err := w.Write(tc.body)
+					return err
+				})
+			} else {
+				writeVariantSource(t, dir, tc.url, encodeGIF(solidImg(16, 16)))
+			}
+			data, m, err := s.Variant(tc.url, 96)
+			if err != nil {
+				t.Fatalf("variant: %v", err)
+			}
+			if m != tc.mime {
+				t.Fatalf("want %s, got %s", tc.mime, m)
+			}
+			src, _ := os.ReadFile(filepath.Join(dir, filepath.FromSlash(strings.TrimPrefix(tc.url, "/uploads/"))))
+			if !bytes.Equal(data, src) {
+				t.Fatalf("%s should pass through unchanged", tc.name)
+			}
+		})
+	}
+}
+
+func TestVariantCachedAndReused(t *testing.T) {
+	s, dir := newUploadTestService(t)
+	url := "/uploads/images/cache.jpg"
+	writeVariantSource(t, dir, url, encodeJPEG(solidImg(1000, 500)))
+
+	first, m, err := s.Variant(url, 384)
+	if err != nil {
+		t.Fatalf("first variant: %v", err)
+	}
+	if m != "image/webp" {
+		t.Fatalf("want webp, got %s", m)
+	}
+	cache := s.variantCacheFile(url, 384)
+	if info, err := os.Stat(cache); err != nil || info.IsDir() {
+		t.Fatalf("cache file should exist: %v", err)
+	}
+	second, _, err := s.Variant(url, 384)
+	if err != nil {
+		t.Fatalf("second variant: %v", err)
+	}
+	if !bytes.Equal(first, second) {
+		t.Fatal("cached variant should be byte-identical")
+	}
+}
+
+func TestVariantCacheFreshness(t *testing.T) {
+	_, dir := newUploadTestService(t)
+	cache := filepath.Join(dir, ".thumbs", "v", "x.webp")
+	if err := os.MkdirAll(filepath.Dir(cache), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(cache, []byte("data"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	// 远程对象：modTime 零值，存在即新鲜
+	if !variantCacheFresh(cache, time.Time{}) {
+		t.Fatal("remote cache should be fresh when file exists")
+	}
+	// 本地源：mtime 新于缓存 → 不新鲜
+	future := time.Now().Add(1 * time.Hour)
+	if variantCacheFresh(cache, future) {
+		t.Fatal("cache should be stale vs newer source mtime")
+	}
+}
+
+func TestVariantRemoteRejectsBadID(t *testing.T) {
+	s, _ := newUploadTestService(t)
+	s.ops = NewOperations(s.db, &config.Config{})
+
+	if _, _, err := s.Variant("/api/media/bad/id", 96); err == nil {
+		t.Fatal("id with slash should be rejected")
+	}
+}
+
+func TestVariantRemoteUnavailable(t *testing.T) {
+	s, _ := newUploadTestService(t)
+	s.ops = NewOperations(s.db, &config.Config{})
+
+	// 表不存在/对象不存在：统一对外“暂不可用”，不泄漏细节
+	if _, _, err := s.Variant("/api/media/deadbeef", 96); err == nil {
+		t.Fatal("missing remote object should error")
+	}
+}
+
+func TestVariantRemoteWithoutOps(t *testing.T) {
+	s, _ := newUploadTestService(t)
+	if _, _, err := s.Variant("/api/media/abc", 96); err == nil {
+		t.Fatal("remote url without ops wired should error")
+	}
+}

backend/service/leaderboard.go

@@ -14,7 +14,7 @@ const (
 	PeriodMonth = "month"
 	PeriodAll   = "all"
 
-	MetricAll     = "all"     // 综合：周/月=四项合计，总榜=累计积分
+	MetricAll     = "all"     // 综合：总榜=累计积分，周/月=周期内获得积分
 	MetricPost    = "post"    // 发帖最多
 	MetricComment = "comment" // 回复最多
 	MetricLike    = "like"    // 获赞最多
@@ -112,6 +112,41 @@ func (s *LeaderboardService) contentStats(from, to *time.Time) (map[uint]statsRo
 	return out, nil
 }
 
+// earnedPoints 周期内累计获得积分：point_ledgers 正入账合计（排除 bounty_refund，
+// 与 users.total_points 启动回填口径一致），仅统计未封禁用户。
+// 签到、发帖/回复奖励、被推荐、悬赏采纳等均按实际入账分值计入贡献值
+func (s *LeaderboardService) earnedPoints(from, to *time.Time) (map[uint]int64, error) {
+	clause := ""
+	var timeArgs []interface{}
+	if from != nil {
+		clause += " AND l.created_at >= ?"
+		timeArgs = append(timeArgs, *from)
+	}
+	if to != nil {
+		clause += " AND l.created_at < ?"
+		timeArgs = append(timeArgs, *to)
+	}
+	sql := "SELECT l.user_id AS user_id, SUM(l.delta) AS pts FROM point_ledgers l" +
+		" JOIN users AS u ON u.id = l.user_id" +
+		" WHERE l.delta > 0 AND l.reason <> ? AND u.banned = ? AND u.deleted_at IS NULL" + clause +
+		" GROUP BY l.user_id"
+	args := []interface{}{model.PointReasonBountyRefund, false}
+	args = append(args, timeArgs...)
+
+	var rows []struct {
+		UserID uint
+		Pts    int64
+	}
+	if err := s.db.Raw(sql, args...).Scan(&rows).Error; err != nil {
+		return nil, err
+	}
+	out := make(map[uint]int64, len(rows))
+	for _, r := range rows {
+		out[r.UserID] = r.Pts
+	}
+	return out, nil
+}
+
 // answerStats 最佳答案统计：问答/悬赏帖中其评论被采纳（type_meta.accepted_comment_id）的条数，
 // 按帖子发布时间窗计；type_meta 为 JSON 字符串，空值/缺失统一落 0（JOIN 不到即不计）
 func (s *LeaderboardService) answerStats(from, to *time.Time) (map[uint]int64, error) {
@@ -167,7 +202,7 @@ func (s *LeaderboardService) statsFor(from, to *time.Time) (map[uint]statsRow, e
 	return stats, nil
 }
 
-// scoreOf 指标 → 排名得分；综合 = 四项合计（总榜-全部走累计积分口径，见 boardBetween）
+// scoreOf 细分指标 → 排名得分；「全部」维度走积分口径（见 boardBetween / earnedPoints）
 func scoreOf(metric string, st statsRow) int64 {
 	switch metric {
 	case MetricPost:
@@ -178,9 +213,8 @@ func scoreOf(metric string, st statsRow) int64 {
 		return st.LikeCount
 	case MetricAnswer:
 		return st.AnswerCount
-	default:
-		return st.PostCount + st.CommentCount + st.LikeCount + st.AnswerCount
 	}
+	return 0
 }
 
 // entryFromUser 由用户行构造榜单条目（不含统计）
@@ -214,7 +248,8 @@ func periodBounds(period string, now time.Time) (from, to, prevFrom, prevTo *tim
 }
 
 // boardBetween 指定时间窗的全量榜单（未截断，Rank 未编号）。
-// 「总榜+全部」走累计积分口径（total_points），其余走统计聚合口径。
+// 「全部」维度走积分口径（总榜=total_points，周/月=周期内获得积分，见 earnedPoints），
+// 细分维度走统计聚合口径。
 func (s *LeaderboardService) boardBetween(from, to *time.Time, period, metric string) ([]LeaderboardEntry, error) {
 	if metric == MetricAll && from == nil {
 		var users []model.User
@@ -245,9 +280,29 @@ func (s *LeaderboardService) boardBetween(from, to *time.Time, period, metric st
 	if err != nil {
 		return nil, err
 	}
-	entries := make([]LeaderboardEntry, 0, len(stats))
+	// 周/月·全部：贡献值=周期内累计获得积分，候选集并入仅签到/获奖无内容的用户
+	usePts := metric == MetricAll && from != nil
+	pts := map[uint]int64{}
+	if usePts {
+		if pts, err = s.earnedPoints(from, to); err != nil {
+			return nil, err
+		}
+	}
+	cand := make(map[uint]statsRow, len(stats)+len(pts))
 	for id, r := range stats {
+		cand[id] = r
+	}
+	for id := range pts {
+		if _, ok := cand[id]; !ok {
+			cand[id] = statsRow{}
+		}
+	}
+	entries := make([]LeaderboardEntry, 0, len(cand))
+	for id, r := range cand {
 		score := scoreOf(metric, r)
+		if usePts {
+			score = pts[id]
+		}
 		if score <= 0 {
 			continue
 		}

backend/service/leaderboard_test.go

@@ -0,0 +1,67 @@
+package service
+
+import (
+	"testing"
+	"time"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+// 贡献值口径：earnedPoints 只累计窗口内正入账积分（排除 bounty_refund），
+// 支出、悬赏退回、封禁用户、窗口外入账均不计
+func TestEarnedPointsWindowAndExclusions(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.PointLedger{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+
+	now := time.Now()
+	weekAgo := now.AddDate(0, 0, -7)
+	users := []*model.User{
+		{Username: "earner", Password: "x"},
+		{Username: "refund_only", Password: "x"},
+		{Username: "banned", Password: "x", Banned: true},
+		{Username: "old_earner", Password: "x"},
+	}
+	for _, u := range users {
+		if err := db.Create(u).Error; err != nil {
+			t.Fatalf("seed user %s: %v", u.Username, err)
+		}
+	}
+	a, d := users[0].ID, users[3].ID
+	ledgers := []model.PointLedger{
+		{UserID: a, Delta: 5, Reason: model.PointReasonCheckin, Balance: 5, CreatedAt: now},
+		{UserID: a, Delta: 3, Reason: model.PointReasonReplyReward, Balance: 8, CreatedAt: now},
+		{UserID: a, Delta: 2, Reason: model.PointReasonStreakBonus, Balance: 10, CreatedAt: now.Add(-time.Hour)},
+		{UserID: a, Delta: -3, Reason: model.PointReasonUnlockPost, Balance: 7, CreatedAt: now},                 // 支出不计
+		{UserID: users[1].ID, Delta: 8, Reason: model.PointReasonBountyRefund, Balance: 8, CreatedAt: now},      // 退回不计
+		{UserID: users[2].ID, Delta: 5, Reason: model.PointReasonCheckin, Balance: 5, CreatedAt: now},           // 封禁不计
+		{UserID: d, Delta: 5, Reason: model.PointReasonCheckin, Balance: 5, CreatedAt: weekAgo.Add(-time.Hour)}, // 窗口外
+	}
+	if err := db.Create(&ledgers).Error; err != nil {
+		t.Fatalf("seed ledgers: %v", err)
+	}
+
+	s := NewLeaderboardService(db)
+	from := weekAgo
+	pts, err := s.earnedPoints(&from, nil)
+	if err != nil {
+		t.Fatalf("earnedPoints: %v", err)
+	}
+	if len(pts) != 1 || pts[a] != 10 {
+		t.Fatalf("周窗内应仅 earner 计 10 分，got %v", pts)
+	}
+
+	all, err := s.earnedPoints(nil, nil)
+	if err != nil {
+		t.Fatalf("earnedPoints(all): %v", err)
+	}
+	if len(all) != 2 || all[a] != 10 || all[d] != 5 {
+		t.Fatalf("全窗口：earner=10、old_earner=5，退回/封禁不计，got %v", all)
+	}
+}

backend/service/legacyimport.go

@@ -102,7 +102,7 @@ type LegacyUserPreview struct {
 	Nickname  string `json:"nickname"`
 	Posts     int    `json:"posts"`
 	Comments  int    `json:"comments"`
-	Exists    bool   `json:"exists"`    // 本站已有同名账号（导入时自动跳过建号）
+	Exists    bool   `json:"exists"` // 本站已有同名账号（导入时自动跳过建号）
 	HasAvatar bool   `json:"has_avatar"`
 }
 
@@ -142,8 +142,8 @@ type LegacyUserReport struct {
 
 // LegacyBoardReport 板块导入明细
 type LegacyBoardReport struct {
-	Created int      `json:"created"` // 新建（预检时为「将新建」）
-	Reused  int      `json:"reused"`  // 复用同名已有板块
+	Created int      `json:"created"`         // 新建（预检时为「将新建」）
+	Reused  int      `json:"reused"`          // 复用同名已有板块
 	Names   []string `json:"names,omitempty"` // 新建板块名
 }
 
@@ -151,7 +151,7 @@ type LegacyBoardReport struct {
 type LegacyPostReport struct {
 	Total          int      `json:"total"`
 	Imported       int      `json:"imported"`
-	Skipped        int      `json:"skipped"` // 已导入过（去重记录）
+	Skipped        int      `json:"skipped"`  // 已导入过（去重记录）
 	Excluded       int      `json:"excluded"` // 手动排除
 	ExcludedDetail []string `json:"excluded_detail,omitempty"`
 	PollsSkipped   int      `json:"polls_skipped"`
@@ -751,19 +751,19 @@ func (s *LegacyImportService) importPosts(oldDB *gorm.DB, boardMap map[uint]uint
 			continue
 		}
 		post := model.Post{
-			BoardID:      boardID,
-			UserID:       authorID,
-			Title:        truncateRunesN(title, 256),
-			Content:      content,
-			Tags:         p.Tags,
-			PostType:     model.NormalizePostType(p.PostType), // question→question，normal→discussion
-			Pinned:       p.Pinned,
-			Recommended:  p.Featured,
-			Status:       model.ContentStatusPublished,
-			LikeCount:    p.LikeCount,
-			ViewCount:    p.ViewCount,
-			CreatedAt:    p.CreatedAt,
-			UpdatedAt:    p.UpdatedAt,
+			BoardID:     boardID,
+			UserID:      authorID,
+			Title:       truncateRunesN(title, 256),
+			Content:     content,
+			Tags:        p.Tags,
+			PostType:    model.NormalizePostType(p.PostType), // question→question，normal→discussion
+			Pinned:      p.Pinned,
+			Recommended: p.Featured,
+			Status:      model.ContentStatusPublished,
+			LikeCount:   p.LikeCount,
+			ViewCount:   p.ViewCount,
+			CreatedAt:   p.CreatedAt,
+			UpdatedAt:   p.UpdatedAt,
 		}
 		if err := s.db.Create(&post).Error; err != nil {
 			out.Failed = append(out.Failed, fmt.Sprintf("%s (写入失败: %v)", title, err))

backend/service/legacyimport_test.go

@@ -136,9 +136,9 @@ func TestLegacyImportSelectiveRun(t *testing.T) {
 	svc, oldPath, avatarZip, imagesZip, adminID, hallMembers := newLegacyTestEnv(t)
 	opts := LegacyImportOptions{
 		WithContent:     true,
-		SkipUserIDs:     map[uint]bool{2: true, 3: true},   // bob / carol 不建号
-		UserTargetNames: map[uint]string{2: "admin"},      // bob 的内容归到已有账号 admin
-		SkipCommentIDs:  map[uint]bool{202: true},          // 排除 alice 在 #101 的评论
+		SkipUserIDs:     map[uint]bool{2: true, 3: true}, // bob / carol 不建号
+		UserTargetNames: map[uint]string{2: "admin"},     // bob 的内容归到已有账号 admin
+		SkipCommentIDs:  map[uint]bool{202: true},        // 排除 alice 在 #101 的评论
 	}
 	rep, err := svc.ImportFromFiles(oldPath, avatarZip, imagesZip, opts, adminID)
 	if err != nil {
@@ -241,8 +241,8 @@ func TestLegacyImportSelectiveRun(t *testing.T) {
 func TestLegacyImportSkipPostCascades(t *testing.T) {
 	svc, oldPath, avatarZip, imagesZip, adminID, _ := newLegacyTestEnv(t)
 	opts := LegacyImportOptions{
-		WithContent:  true,
-		SkipPostIDs:  map[uint]bool{101: true}, // #101 排除 → 其评论 #202 自动跳过
+		WithContent: true,
+		SkipPostIDs: map[uint]bool{101: true}, // #101 排除 → 其评论 #202 自动跳过
 	}
 	rep, err := svc.ImportFromFiles(oldPath, avatarZip, imagesZip, opts, adminID)
 	if err != nil {

backend/service/library.go

@@ -0,0 +1,652 @@
+package service
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"gorm.io/gorm"
+)
+
+// 书库文件扩展名白名单（小写、不含点）；附件仅提供下载分发，
+// 书籍正文走章节阅读，不做在线预览
+var libraryAllowedExts = map[string]struct{}{
+	"html": {}, "htm": {}, "pdf": {}, "epub": {}, "mobi": {}, "azw3": {},
+	"zip": {}, "7z": {}, "rar": {}, "txt": {}, "md": {},
+	"doc": {}, "docx": {}, "ppt": {}, "pptx": {},
+}
+
+const (
+	MaxLibraryFilesPerDoc = 20
+	libraryDescriptionMax = 20000
+)
+
+var (
+	ErrLibraryNotFound   = errors.New("书库条目不存在")
+	ErrLibraryExtDenied  = errors.New("不支持该文档格式")
+	ErrLibraryTooMany    = errors.New("文件数量超过上限")
+	ErrLibraryNotDeleted = errors.New("仅已删除的条目可彻底删除")
+)
+
+// LibraryExtAllowed 上传扩展名是否在书库白名单内
+func LibraryExtAllowed(ext string) bool {
+	_, ok := libraryAllowedExts[strings.ToLower(strings.TrimPrefix(ext, "."))]
+	return ok
+}
+
+// 写入时显式列出字段（独立 Select 参数，同 sitePageWriteFields）
+var libraryDocWriteFields = []string{
+	"Slug", "Title", "Description", "CoverURL", "CoverWidth", "CoverHeight",
+	"Published", "SortOrder", "EntriesAuto", "Author", "CreatorID",
+}
+
+// LibraryCreator 条目创建者摘要（仅列表/详情展示所需字段；用户已注销时为 nil）
+type LibraryCreator struct {
+	ID       uint   `json:"id"`
+	Username string `json:"username"`
+	Nickname string `json:"nickname"`
+	Avatar   string `json:"avatar"`
+}
+
+// LibraryDocDetail 条目 + 文件列表 + 章节树（管理端与公开详情共用）
+type LibraryDocDetail struct {
+	model.LibraryDoc
+	Deleted  bool                   `json:"deleted"` // 软删标记（DeletedAt json:"-" 不出模型）
+	Files    []model.LibraryFile    `json:"files"`
+	Sections []model.LibrarySection `json:"sections"`
+	Creator  *LibraryCreator        `json:"creator,omitempty"` // 创建者摘要（0/已注销=nil）
+}
+
+// LibraryDocListItem 公开目录条目（description 纯文本截断，含文件概要）
+type LibraryDocListItem struct {
+	ID          uint                `json:"id"`
+	Slug        string              `json:"slug"`
+	Title       string              `json:"title"`
+	Author      string              `json:"author"`
+	Description string              `json:"description"`
+	CoverURL    string              `json:"cover_url"`
+	SortOrder   int                 `json:"sort_order"`
+	FileCount   int                 `json:"file_count"`
+	Files       []model.LibraryFile `json:"files"`
+	Creator     *LibraryCreator     `json:"creator,omitempty"`
+	CreatedAt   time.Time           `json:"created_at"`
+	UpdatedAt   time.Time           `json:"updated_at"`
+}
+
+// LibraryInput 创建/更新书库条目入参
+type LibraryInput struct {
+	Slug        string `json:"slug"`
+	Title       string `json:"title"`
+	Author      string `json:"author"` // 书籍作者（自由文本，可空）
+	Description string `json:"description"`
+	CoverURL    string `json:"cover_url"`
+	CoverWidth  int    `json:"cover_width"`  // 封面自然宽（0=未知）
+	CoverHeight int    `json:"cover_height"` // 封面自然高（0=未知）
+	Published   *bool  `json:"published"`
+	SortOrder   *int   `json:"sort_order"`
+	EntriesAuto *bool  `json:"entries_auto"` // 全章节条目卡模式（nil=不修改）
+}
+
+func (in *LibraryInput) normalize() error {
+	in.Slug = strings.ToLower(strings.TrimSpace(in.Slug))
+	if in.Slug == "" {
+		return errors.New("slug 不能为空")
+	}
+	if len(in.Slug) > 64 {
+		return errors.New("slug 不能超过 64 字符")
+	}
+	if !sitePageSlugRe.MatchString(in.Slug) {
+		return errors.New("slug 仅允许小写字母、数字与连字符")
+	}
+
+	in.Title = strings.TrimSpace(in.Title)
+	if in.Title == "" {
+		return errors.New("标题不能为空")
+	}
+	if utf8.RuneCountInString(in.Title) > 200 {
+		return errors.New("标题不能超过 200 字")
+	}
+
+	in.Author = strings.TrimSpace(in.Author)
+	if utf8.RuneCountInString(in.Author) > 100 {
+		return errors.New("作者不能超过 100 字")
+	}
+
+	in.Description = strings.TrimSpace(in.Description)
+	if utf8.RuneCountInString(in.Description) > libraryDescriptionMax {
+		return errors.New("介绍不能超过 20000 字")
+	}
+
+	in.CoverURL = strings.TrimSpace(in.CoverURL)
+	if utf8.RuneCountInString(in.CoverURL) > 512 {
+		return errors.New("封面地址过长")
+	}
+
+	return nil
+}
+
+func (in *LibraryInput) applyTo(d *model.LibraryDoc) {
+	d.Slug = in.Slug
+	d.Title = in.Title
+	d.Author = in.Author
+	d.Description = in.Description
+	d.CoverURL = in.CoverURL
+	// 封面清空时一并清除尺寸；有封面但未传尺寸时保留 0（前端回退运行时探测）
+	if in.CoverURL == "" {
+		d.CoverWidth = 0
+		d.CoverHeight = 0
+	} else {
+		d.CoverWidth = in.CoverWidth
+		d.CoverHeight = in.CoverHeight
+	}
+	if in.Published != nil {
+		d.Published = *in.Published
+	}
+	if in.SortOrder != nil {
+		d.SortOrder = *in.SortOrder
+	}
+	if in.EntriesAuto != nil {
+		d.EntriesAuto = *in.EntriesAuto
+	}
+}
+
+// LibraryService 书库服务（条目 CRUD + 文件落盘/下载/预览）
+type LibraryService struct {
+	db         *gorm.DB
+	dir        string // data/library（绝不放 data/uploads：静态目录会按扩展名原样 serve html）
+	uploadsDir string // data/uploads：封面回填时解析本地封面图
+	setting    *SettingService
+}
+
+func NewLibraryService(db *gorm.DB, dataDir string) *LibraryService {
+	return &LibraryService{db: db, dir: filepath.Join(dataDir, "library")}
+}
+
+// WithSetting 注入站点设置（文件大小上限复用附件设置）
+func (s *LibraryService) WithSetting(setting *SettingService) *LibraryService {
+	s.setting = setting
+	return s
+}
+
+// WithUploadsDir 注入上传根目录（封面回填用：把 /uploads/... 封面 URL 解析为本地文件）
+func (s *LibraryService) WithUploadsDir(uploadsDir string) *LibraryService {
+	s.uploadsDir = uploadsDir
+	return s
+}
+
+func (s *LibraryService) EnsureDir() error {
+	return os.MkdirAll(s.dir, 0o755)
+}
+
+func (s *LibraryService) FilePath(f *model.LibraryFile) string {
+	return filepath.Join(s.dir, f.StoredName)
+}
+
+// slugTaken 查询 slug 占用情况（Unscoped 含软删行：软删行仍占用数据库唯一索引）
+// active=在用条目占用；deleted=已删除条目占用
+func (s *LibraryService) slugTaken(slug string, excludeID uint) (active, deleted bool, err error) {
+	q := s.db.Unscoped().Model(&model.LibraryDoc{}).Where("slug = ?", slug).Select("deleted_at")
+	if excludeID > 0 {
+		q = q.Where("id <> ?", excludeID)
+	}
+	var rows []struct {
+		DeletedAt gorm.DeletedAt
+	}
+	if err := q.Find(&rows).Error; err != nil {
+		return false, false, err
+	}
+	for _, r := range rows {
+		if r.DeletedAt.Valid {
+			deleted = true
+		} else {
+			active = true
+		}
+	}
+	return active, deleted, nil
+}
+
+// ---------- 条目：管理端 ----------
+
+// ListAll 管理后台全部条目（含未发布与已软删，带文件；已删条目仅供查看与彻底删除）
+func (s *LibraryService) ListAll() ([]LibraryDocDetail, error) {
+	var docs []model.LibraryDoc
+	if err := s.db.Unscoped().Order("sort_order ASC, id ASC").Limit(200).Find(&docs).Error; err != nil {
+		return nil, err
+	}
+	return s.attachFiles(docs), nil
+}
+
+// Get 管理后台按 ID 取条目
+func (s *LibraryService) Get(id uint) (*LibraryDocDetail, error) {
+	var d model.LibraryDoc
+	if err := s.db.First(&d, id).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	out := s.attachFiles([]model.LibraryDoc{d})
+	return &out[0], nil
+}
+
+func (s *LibraryService) attachFiles(docs []model.LibraryDoc) []LibraryDocDetail {
+	out := make([]LibraryDocDetail, 0, len(docs))
+	if len(docs) == 0 {
+		return out
+	}
+	ids := make([]uint, 0, len(docs))
+	for _, d := range docs {
+		ids = append(ids, d.ID)
+	}
+	var files []model.LibraryFile
+	if err := s.db.Where("doc_id IN ?", ids).
+		Order("sort_order ASC, id ASC").Find(&files).Error; err != nil {
+		files = nil
+	}
+	byDoc := make(map[uint][]model.LibraryFile, len(docs))
+	for _, f := range files {
+		byDoc[f.DocID] = append(byDoc[f.DocID], f)
+	}
+	var sections []model.LibrarySection
+	if err := s.db.Where("doc_id IN ?", ids).
+		Order("sort_order ASC, id ASC").Find(&sections).Error; err != nil {
+		sections = nil
+	}
+	secByDoc := make(map[uint][]model.LibrarySection, len(docs))
+	for _, sec := range sections {
+		secByDoc[sec.DocID] = append(secByDoc[sec.DocID], sec)
+	}
+	creatorByID := s.creatorMap(docs)
+	for _, d := range docs {
+		fs := byDoc[d.ID]
+		if fs == nil {
+			fs = []model.LibraryFile{}
+		}
+		ss := secByDoc[d.ID]
+		if ss == nil {
+			ss = []model.LibrarySection{}
+		}
+		out = append(out, LibraryDocDetail{
+			LibraryDoc: d, Deleted: d.DeletedAt.Valid, Files: fs, Sections: ss,
+			Creator: creatorByID[d.CreatorID],
+		})
+	}
+	return out
+}
+
+// creatorMap 批量取条目创建者摘要（一条 SQL，避免列表 N+1；已注销用户查不到即缺省）
+func (s *LibraryService) creatorMap(docs []model.LibraryDoc) map[uint]*LibraryCreator {
+	ids := make([]uint, 0, len(docs))
+	seen := map[uint]bool{}
+	for _, d := range docs {
+		if d.CreatorID > 0 && !seen[d.CreatorID] {
+			seen[d.CreatorID] = true
+			ids = append(ids, d.CreatorID)
+		}
+	}
+	if len(ids) == 0 {
+		return map[uint]*LibraryCreator{}
+	}
+	var users []model.User
+	if err := s.db.Select("id, username, nickname, avatar").Where("id IN ?", ids).Find(&users).Error; err != nil {
+		return map[uint]*LibraryCreator{}
+	}
+	m := make(map[uint]*LibraryCreator, len(users))
+	for i := range users {
+		u := &users[i]
+		m[u.ID] = &LibraryCreator{ID: u.ID, Username: u.Username, Nickname: u.Nickname, Avatar: u.Avatar}
+	}
+	return m
+}
+
+func (s *LibraryService) Create(in *LibraryInput, creatorID ...uint) (*model.LibraryDoc, error) {
+	if err := in.normalize(); err != nil {
+		return nil, err
+	}
+	active, deleted, err := s.slugTaken(in.Slug, 0)
+	if err != nil {
+		return nil, err
+	}
+	if active {
+		return nil, errors.New("slug 已被占用")
+	}
+	if deleted {
+		return nil, errors.New("该地址已被已删除条目占用，可在书库管理列表中彻底删除后重新使用")
+	}
+	d := &model.LibraryDoc{Published: false, SortOrder: 0}
+	if len(creatorID) > 0 {
+		d.CreatorID = creatorID[0]
+	}
+	in.applyTo(d)
+	if err := s.db.Select(libraryDocWriteFields).Create(d).Error; err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+func (s *LibraryService) Update(id uint, in *LibraryInput) (*model.LibraryDoc, error) {
+	var d model.LibraryDoc
+	if err := s.db.First(&d, id).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	if err := in.normalize(); err != nil {
+		return nil, err
+	}
+	active, deleted, err := s.slugTaken(in.Slug, id)
+	if err != nil {
+		return nil, err
+	}
+	if active {
+		return nil, errors.New("slug 已被占用")
+	}
+	if deleted {
+		return nil, errors.New("该地址已被已删除条目占用，可在书库管理列表中彻底删除后重新使用")
+	}
+	in.applyTo(&d)
+	// map 更新确保 false/空串写入（同 SitePage.Update）；creator_id 创建后不变，不在此列
+	if err := s.db.Model(&model.LibraryDoc{}).Where("id = ?", d.ID).Updates(map[string]interface{}{
+		"slug":         d.Slug,
+		"title":        d.Title,
+		"author":       d.Author,
+		"description":  d.Description,
+		"cover_url":    d.CoverURL,
+		"cover_width":  d.CoverWidth,
+		"cover_height": d.CoverHeight,
+		"published":    d.Published,
+		"sort_order":   d.SortOrder,
+		"entries_auto": d.EntriesAuto,
+	}).Error; err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// resolveCoverPath 把 /uploads/... 封面 URL 解析为本地绝对路径；外链返回空串
+func (s *LibraryService) resolveCoverPath(coverURL string) (string, bool) {
+	rel := strings.TrimPrefix(strings.TrimSpace(coverURL), "/uploads/")
+	if rel == "" || rel == coverURL || strings.Contains(rel, "..") {
+		return "", false
+	}
+	abs := filepath.Join(s.uploadsDir, filepath.FromSlash(rel))
+	root := filepath.Clean(s.uploadsDir)
+	clean := filepath.Clean(abs)
+	if clean != root && !strings.HasPrefix(clean, root+string(os.PathSeparator)) {
+		return "", false
+	}
+	return clean, true
+}
+
+// measureCoverReader 从图片流读取自然宽高（复用上传层的格式探测与尺寸解码）
+func measureCoverReader(r io.Reader) (w, h int, err error) {
+	data, err := io.ReadAll(r)
+	if err != nil {
+		return 0, 0, err
+	}
+	format, err := detectImageFormat(data)
+	if err != nil {
+		return 0, 0, err
+	}
+	return decodeImageSizeReader(bytes.NewReader(data), format.mime)
+}
+
+// ensureCoverDimensions 若条目有封面但未存自然宽高，则测量并写回库（幂等：已有尺寸直接跳过）。
+// 用于读路径懒回填，避免独立运维接口：首次访问后尺寸即落库，后续 SSR 首帧直接判定横竖版。
+func (s *LibraryService) ensureCoverDimensions(d *model.LibraryDoc) {
+	if d.CoverURL == "" || (d.CoverWidth > 0 && d.CoverHeight > 0) || s.uploadsDir == "" {
+		return
+	}
+	url := strings.TrimSpace(d.CoverURL)
+	var reader io.ReadCloser
+	switch {
+	case strings.HasPrefix(url, "/uploads/"):
+		abs, ok := s.resolveCoverPath(url)
+		if !ok {
+			return
+		}
+		f, err := os.Open(abs)
+		if err != nil {
+			return
+		}
+		reader = f
+	case strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://"):
+		client := &http.Client{Timeout: 10 * time.Second}
+		resp, err := client.Get(url)
+		if err != nil {
+			return
+		}
+		reader = resp.Body
+	default:
+		return
+	}
+	w, h, err := measureCoverReader(reader)
+	reader.Close()
+	if err != nil || w <= 0 || h <= 0 {
+		return
+	}
+	if err := s.db.Model(d).Updates(map[string]interface{}{
+		"cover_width":  w,
+		"cover_height": h,
+	}).Error; err != nil {
+		return
+	}
+	d.CoverWidth, d.CoverHeight = w, h
+}
+
+func (s *LibraryService) Delete(id uint) error {
+	result := s.db.Delete(&model.LibraryDoc{}, id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return ErrLibraryNotFound
+	}
+	return nil
+}
+
+// Purge 彻底删除已软删的条目（章节/文件行与磁盘文件一并清除，slug 释放可复用）
+func (s *LibraryService) Purge(id uint) error {
+	var d model.LibraryDoc
+	if err := s.db.Unscoped().First(&d, id).Error; err != nil {
+		return ErrLibraryNotFound
+	}
+	if !d.DeletedAt.Valid {
+		return ErrLibraryNotDeleted
+	}
+	// 先取出文件清单（含此前单独软删的文件行），事务成功后统一删磁盘
+	var files []model.LibraryFile
+	if err := s.db.Unscoped().Where("doc_id = ?", id).Find(&files).Error; err != nil {
+		return err
+	}
+	err := s.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Unscoped().Where("doc_id = ?", id).Delete(&model.LibrarySection{}).Error; err != nil {
+			return err
+		}
+		if err := tx.Unscoped().Where("doc_id = ?", id).Delete(&model.LibraryFile{}).Error; err != nil {
+			return err
+		}
+		return tx.Unscoped().Delete(&model.LibraryDoc{}, id).Error
+	})
+	if err != nil {
+		return err
+	}
+	// 事务外尽力删除磁盘文件（同 DeleteFile 惯例，失败不影响返回）
+	for i := range files {
+		_ = os.Remove(s.FilePath(&files[i]))
+	}
+	return nil
+}
+
+// ---------- 条目：公开端 ----------
+
+// ListPublished 已发布条目目录（含文件概要，不含 description 全文）
+func (s *LibraryService) ListPublished() ([]LibraryDocListItem, error) {
+	details, err := s.publishedDetails()
+	if err != nil {
+		return nil, err
+	}
+	out := make([]LibraryDocListItem, 0, len(details))
+	for _, d := range details {
+		out = append(out, LibraryDocListItem{
+			ID: d.ID, Slug: d.Slug, Title: d.Title, Author: d.Author, Description: d.Description,
+			CoverURL: d.CoverURL, SortOrder: d.SortOrder, FileCount: len(d.Files), Files: d.Files,
+			Creator:   d.Creator,
+			CreatedAt: d.CreatedAt, UpdatedAt: d.UpdatedAt,
+		})
+	}
+	return out, nil
+}
+
+// GetPublishedBySlug 公开详情（仅已发布）
+func (s *LibraryService) GetPublishedBySlug(slug string) (*LibraryDocDetail, error) {
+	slug = strings.ToLower(strings.TrimSpace(slug))
+	var d model.LibraryDoc
+	if err := s.db.Where("slug = ? AND published = ?", slug, true).First(&d).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	// 懒回填：有封面但未存尺寸时当场测量并写回（首次访问后即稳定，消除横竖版探测闪烁）
+	s.ensureCoverDimensions(&d)
+	out := s.attachFiles([]model.LibraryDoc{d})
+	return &out[0], nil
+}
+
+func (s *LibraryService) publishedDetails() ([]LibraryDocDetail, error) {
+	var docs []model.LibraryDoc
+	if err := s.db.Where("published = ?", true).
+		Order("sort_order ASC, id ASC").Limit(100).Find(&docs).Error; err != nil {
+		return nil, err
+	}
+	return s.attachFiles(docs), nil
+}
+
+// ---------- 文件 ----------
+
+func (s *LibraryService) maxBytes() int64 {
+	if s.setting == nil {
+		return FileMaxBytes
+	}
+	n, err := s.setting.AttachmentMaxBytes()
+	if err != nil || n < 1 {
+		return FileMaxBytes
+	}
+	return n
+}
+
+// AddFile 上传文件到条目（落盘 data/library + 建行）
+func (s *LibraryService) AddFile(docID, userID uint, originalName string, src io.Reader) (*model.LibraryFile, error) {
+	if src == nil {
+		return nil, errors.New("文件为空")
+	}
+	var doc model.LibraryDoc
+	if err := s.db.First(&doc, docID).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+
+	name := sanitizeFilename(originalName)
+	if name == "" {
+		name = "file"
+	}
+	ext := strings.TrimPrefix(ExtOfFilename(name), ".")
+	if !LibraryExtAllowed(ext) {
+		return nil, ErrLibraryExtDenied
+	}
+
+	var count int64
+	if err := s.db.Model(&model.LibraryFile{}).Where("doc_id = ?", docID).Count(&count).Error; err != nil {
+		return nil, err
+	}
+	if count >= MaxLibraryFilesPerDoc {
+		return nil, ErrLibraryTooMany
+	}
+
+	raw := make([]byte, 16)
+	if _, err := rand.Read(raw); err != nil {
+		return nil, err
+	}
+	stored := hex.EncodeToString(raw) + "." + ext
+	full := filepath.Join(s.dir, stored)
+
+	f, err := os.OpenFile(full, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+	if err != nil {
+		return nil, err
+	}
+	maxB := s.maxBytes()
+	written, copyErr := io.Copy(f, io.LimitReader(src, maxB+1))
+	_ = f.Close()
+	if copyErr != nil {
+		_ = os.Remove(full)
+		return nil, copyErr
+	}
+	if written == 0 {
+		_ = os.Remove(full)
+		return nil, errors.New("文件为空")
+	}
+	if written > maxB {
+		_ = os.Remove(full)
+		mb := int(maxB >> 20)
+		if mb < 1 {
+			mb = 1
+		}
+		return nil, errors.New("文件过大：不能超过 " + strconv.Itoa(mb) + "MB")
+	}
+
+	file := &model.LibraryFile{
+		DocID:      docID,
+		UserID:     userID,
+		Name:       name,
+		StoredName: stored,
+		Ext:        ext,
+		MIME:       MimeForAttachmentExt("." + ext),
+		Size:       int(written),
+	}
+	if err := s.db.Create(file).Error; err != nil {
+		_ = os.Remove(full)
+		return nil, err
+	}
+	return file, nil
+}
+
+// DeleteFile 删除文件（软删行 + 磁盘尽力删除）
+func (s *LibraryService) DeleteFile(id uint) error {
+	var f model.LibraryFile
+	if err := s.db.First(&f, id).Error; err != nil {
+		return ErrLibraryNotFound
+	}
+	if err := s.db.Delete(&f).Error; err != nil {
+		return err
+	}
+	_ = os.Remove(s.FilePath(&f))
+	return nil
+}
+
+// GetPublicFile 公开取文件（要求所属条目存在且已发布；软删条目的文件不可达）
+func (s *LibraryService) GetPublicFile(id uint) (*model.LibraryFile, error) {
+	var f model.LibraryFile
+	if err := s.db.First(&f, id).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	if f.DocID == 0 {
+		return nil, ErrLibraryNotFound
+	}
+	var n int64
+	if err := s.db.Model(&model.LibraryDoc{}).
+		Where("id = ? AND published = ?", f.DocID, true).Count(&n).Error; err != nil {
+		return nil, err
+	}
+	if n == 0 {
+		return nil, ErrLibraryNotFound
+	}
+	return &f, nil
+}
+
+// IncrDownload 下载计数原子递增
+func (s *LibraryService) IncrDownload(id uint) {
+	s.db.Model(&model.LibraryFile{}).Where("id = ?", id).
+		UpdateColumn("download_count", gorm.Expr("download_count + 1"))
+}

backend/service/library_export.go

@@ -0,0 +1,369 @@
+package service
+
+// 书库导出：单本 / 全部条目打包为 ZIP（JSON 清单 + 章节正文 + 附件原文件 + 本地封面），
+// 用于迁移与备份。清单自描述（format + format_version），为将来的导入功能预留。
+//
+// 单本 ZIP 布局：
+//
+//	book.json            书籍清单（元信息 / 章节树 / 附件清单，路径均相对本目录）
+//	cover.<ext>          本地封面（外链封面不内嵌，仅保留 cover_url）
+//	files/<stored-name>  附件原文件
+//
+// 全库 ZIP 布局：
+//
+//	library.json                 索引（每本书的目录位置）
+//	docs/<slug>/book.json        各书清单
+//	docs/<slug>/cover.<ext>
+//	docs/<slug>/files/<stored-name>
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/freefire/jiang13-bbs/model"
+)
+
+const (
+	libraryExportFormat     = "jiang13-library"      // 全库包
+	libraryExportBookFormat = "jiang13-library-book" // 单本书包
+	libraryExportVersion    = 1
+)
+
+// 可内嵌进导出包的本地封面扩展名（与上传层支持的图片格式保持一致）
+var libraryExportCoverExts = map[string]struct{}{
+	"jpg": {}, "jpeg": {}, "png": {}, "gif": {}, "webp": {},
+}
+
+// libraryExportFile 附件清单条目
+type libraryExportFile struct {
+	Name          string `json:"name"`             // 原始文件名
+	Stored        string `json:"stored,omitempty"` // ZIP 内相对路径（磁盘缺失时为空）
+	Ext           string `json:"ext"`
+	MIME          string `json:"mime"`
+	Size          int    `json:"size"`
+	DownloadCount int    `json:"download_count"`
+	SortOrder     int    `json:"sort_order"`
+	Missing       bool   `json:"missing,omitempty"` // 数据库有记录但磁盘文件已丢失
+}
+
+// libraryExportSection 章节清单条目（两级树：ParentKey 指向章的 Key）
+type libraryExportSection struct {
+	Key       string `json:"key"`
+	ParentKey string `json:"parent_key,omitempty"`
+	Title     string `json:"title"`
+	Content   string `json:"content"`
+	SortOrder int    `json:"sort_order"`
+}
+
+// libraryExportBook 单本书的完整清单
+type libraryExportBook struct {
+	ID          uint   `json:"id"`
+	CreatedAt   string `json:"created_at"`
+	UpdatedAt   string `json:"updated_at"`
+	Slug        string `json:"slug"`
+	Title       string `json:"title"`
+	Author      string `json:"author"`
+	Description string `json:"description"`
+	CoverURL    string `json:"cover_url"`
+	CoverFile   string `json:"cover_file,omitempty"` // 相对本书目录的内嵌封面路径
+	CoverWidth  int    `json:"cover_width"`
+	CoverHeight int    `json:"cover_height"`
+	Published   bool   `json:"published"`
+	SortOrder   int    `json:"sort_order"`
+	EntriesAuto bool   `json:"entries_auto"`
+
+	Files    []libraryExportFile    `json:"files"`
+	Sections []libraryExportSection `json:"sections"`
+}
+
+// libraryExportIndexEntry 全库索引中的单本概要
+type libraryExportIndexEntry struct {
+	Slug         string `json:"slug"`
+	Title        string `json:"title"`
+	Dir          string `json:"dir"` // 相对 ZIP 根的目录
+	FileCount    int    `json:"file_count"`
+	SectionCount int    `json:"section_count"`
+}
+
+// libraryExportManifest ZIP 根清单：单本包用 Doc，全库包用 Docs 索引
+type libraryExportManifest struct {
+	Format        string                    `json:"format"`
+	FormatVersion int                       `json:"format_version"`
+	ExportedAt    string                    `json:"exported_at"`
+	Doc           *libraryExportBook        `json:"doc,omitempty"`
+	Docs          []libraryExportIndexEntry `json:"docs,omitempty"`
+}
+
+// preparedFile 已打开、待流式拷入 ZIP 的附件
+type preparedFile struct {
+	zipPath string
+	reader  *os.File
+}
+
+// preparedBook 一本书的导出准备结果（清单 + 已打开的文件句柄）
+type preparedBook struct {
+	meta        libraryExportBook
+	dir         string // ZIP 内目录前缀（单本包为空串 = 根目录）
+	coverPath   string // ZIP 内封面路径（空 = 不内嵌）
+	coverReader *os.File
+	files       []preparedFile // 仅磁盘存在的附件
+}
+
+func (b *preparedBook) closeReaders() {
+	if b.coverReader != nil {
+		_ = b.coverReader.Close()
+	}
+	for i := range b.files {
+		_ = b.files[i].reader.Close()
+	}
+}
+
+// LibraryExport 已完成装载、可直接流式写出的导出包
+type LibraryExport struct {
+	Filename   string
+	full       bool
+	exportedAt time.Time
+	books      []preparedBook
+}
+
+// Close 释放导出过程中打开的全部文件句柄
+func (e *LibraryExport) Close() {
+	for i := range e.books {
+		e.books[i].closeReaders()
+	}
+}
+
+// BuildBookExport 装载单本书导出（不存在返回 ErrLibraryNotFound）。
+// 所有失败均发生在写出之前，handler 可安全返回 JSON 错误。
+func (s *LibraryService) BuildBookExport(id uint) (*LibraryExport, error) {
+	d, err := s.Get(id)
+	if err != nil {
+		return nil, err
+	}
+	b, err := s.prepareBook(d, "")
+	if err != nil {
+		return nil, err
+	}
+	name := d.Slug
+	if name == "" {
+		name = "book"
+	}
+	return &LibraryExport{
+		Filename:   name + ".zip",
+		full:       false,
+		exportedAt: time.Now(),
+		books:      []preparedBook{*b},
+	}, nil
+}
+
+// BuildAllExport 装载全库导出（仅在用条目，按 sort_order / id 排序）
+func (s *LibraryService) BuildAllExport() (*LibraryExport, error) {
+	var docs []model.LibraryDoc
+	if err := s.db.Order("sort_order ASC, id ASC").Find(&docs).Error; err != nil {
+		return nil, err
+	}
+	details := s.attachFiles(docs)
+	exp := &LibraryExport{
+		Filename:   "jiang13-library-" + time.Now().Format("20060102-150405") + ".zip",
+		full:       true,
+		exportedAt: time.Now(),
+		books:      make([]preparedBook, 0, len(details)),
+	}
+	for i := range details {
+		// slug 受 [a-z0-9-] 约束，拼接 ZIP 路径无穿越风险；防御性兜底
+		dir := "docs/" + details[i].Slug + "/"
+		if strings.Contains(details[i].Slug, "..") || strings.ContainsAny(details[i].Slug, `/\`) {
+			exp.Close()
+			return nil, errors.New("条目 slug 含非法字符，无法导出")
+		}
+		b, err := s.prepareBook(&details[i], dir)
+		if err != nil {
+			exp.Close()
+			return nil, err
+		}
+		exp.books = append(exp.books, *b)
+	}
+	return exp, nil
+}
+
+// prepareBook 组装单本清单并打开全部待打包文件（dir 为 ZIP 内目录前缀）
+func (s *LibraryService) prepareBook(d *LibraryDocDetail, dir string) (*preparedBook, error) {
+	b := &preparedBook{dir: dir}
+	b.meta = libraryExportBook{
+		ID:          d.ID,
+		CreatedAt:   d.CreatedAt.UTC().Format(time.RFC3339),
+		UpdatedAt:   d.UpdatedAt.UTC().Format(time.RFC3339),
+		Slug:        d.Slug,
+		Title:       d.Title,
+		Author:      d.Author,
+		Description: d.Description,
+		CoverURL:    d.CoverURL,
+		CoverWidth:  d.CoverWidth,
+		CoverHeight: d.CoverHeight,
+		Published:   d.Published,
+		SortOrder:   d.SortOrder,
+		EntriesAuto: d.EntriesAuto,
+		Files:       make([]libraryExportFile, 0, len(d.Files)),
+		Sections:    make([]libraryExportSection, 0, len(d.Sections)),
+	}
+
+	// 章节：按数组序号发 Key，ParentKey 引用父章 Key（attachFiles 已按 sort_order, id 排序）
+	keyByID := make(map[uint]string, len(d.Sections))
+	for i, sec := range d.Sections {
+		keyByID[sec.ID] = "s" + strconv.Itoa(i)
+	}
+	for _, sec := range d.Sections {
+		m := libraryExportSection{
+			Key:       keyByID[sec.ID],
+			Title:     sec.Title,
+			Content:   sec.Content,
+			SortOrder: sec.SortOrder,
+		}
+		if sec.ParentID != nil {
+			m.ParentKey = keyByID[*sec.ParentID]
+		}
+		b.meta.Sections = append(b.meta.Sections, m)
+	}
+
+	// 附件：数据库清单始终保留；磁盘文件存在才打开并记录 ZIP 路径
+	for _, f := range d.Files {
+		m := libraryExportFile{
+			Name:          f.Name,
+			Ext:           f.Ext,
+			MIME:          f.MIME,
+			Size:          f.Size,
+			DownloadCount: f.DownloadCount,
+			SortOrder:     f.SortOrder,
+		}
+		full := filepath.Join(s.dir, f.StoredName)
+		if r, err := os.Open(full); err == nil {
+			m.Stored = "files/" + f.StoredName
+			b.files = append(b.files, preparedFile{zipPath: dir + m.Stored, reader: r})
+		} else {
+			m.Missing = true
+		}
+		b.meta.Files = append(b.meta.Files, m)
+	}
+
+	// 本地封面（/uploads/...）：能解析到磁盘文件则内嵌；外链或缺目录时仅保留 URL
+	if rel, ok := s.resolveCoverPath(d.CoverURL); ok {
+		if ext := coverExtOf(d.CoverURL); ext != "" {
+			if r, err := os.Open(rel); err == nil {
+				b.coverReader = r
+				b.coverPath = dir + "cover." + ext
+				b.meta.CoverFile = "cover." + ext
+			}
+		}
+	}
+	return b, nil
+}
+
+// WriteZip 流式写出 ZIP。调用后文件句柄随之释放；中途的 IO 错误已无法改变 HTTP 状态。
+func (e *LibraryExport) WriteZip(w io.Writer) error {
+	defer e.Close()
+	zw := zip.NewWriter(w)
+
+	index := make([]libraryExportIndexEntry, 0, len(e.books))
+	for i := range e.books {
+		b := &e.books[i]
+		// 全库包每本书在自己的目录内写 book.json；单本包的根清单即 book.json，在循环外写
+		if e.full {
+			if err := writeZipJSON(zw, b.dir+"book.json", b.meta); err != nil {
+				return err
+			}
+		}
+		if b.coverReader != nil {
+			if err := writeZipFile(zw, b.coverPath, b.coverReader); err != nil {
+				return err
+			}
+		}
+		for j := range b.files {
+			if err := writeZipFile(zw, b.files[j].zipPath, b.files[j].reader); err != nil {
+				return err
+			}
+		}
+		index = append(index, libraryExportIndexEntry{
+			Slug:         b.meta.Slug,
+			Title:        b.meta.Title,
+			Dir:          b.dir,
+			FileCount:    len(b.meta.Files),
+			SectionCount: len(b.meta.Sections),
+		})
+	}
+
+	// 单本包根清单为 book.json；全库包根清单为 library.json（各书清单在其目录内）
+	if e.full {
+		root := libraryExportManifest{
+			Format:        libraryExportFormat,
+			FormatVersion: libraryExportVersion,
+			ExportedAt:    e.exportedAt.UTC().Format(time.RFC3339),
+			Docs:          index,
+		}
+		if err := writeZipJSON(zw, "library.json", root); err != nil {
+			return err
+		}
+	} else {
+		root := libraryExportManifest{
+			Format:        libraryExportBookFormat,
+			FormatVersion: libraryExportVersion,
+			ExportedAt:    e.exportedAt.UTC().Format(time.RFC3339),
+			Doc:           &e.books[0].meta,
+		}
+		if err := writeZipJSON(zw, "book.json", root); err != nil {
+			return err
+		}
+	}
+	return zw.Close()
+}
+
+// coverExtOf 从 /uploads/xx.jpg 形式的封面 URL 提取受支持的图片扩展名
+func coverExtOf(coverURL string) string {
+	u := strings.TrimSpace(coverURL)
+	if i := strings.IndexByte(u, '?'); i >= 0 {
+		u = u[:i]
+	}
+	ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(u), "."))
+	if _, ok := libraryExportCoverExts[ext]; !ok {
+		return ""
+	}
+	return ext
+}
+
+// writeZipJSON 写入一个 DEFLATE 压缩的 UTF-8 JSON 条目（关闭 HTML 转义、缩进可读）
+func writeZipJSON(zw *zip.Writer, name string, v any) error {
+	var buf bytes.Buffer
+	enc := json.NewEncoder(&buf)
+	enc.SetEscapeHTML(false)
+	enc.SetIndent("", "  ")
+	if err := enc.Encode(v); err != nil {
+		return err
+	}
+	hdr := &zip.FileHeader{Name: name, Method: zip.Deflate}
+	hdr.SetMode(0o644)
+	f, err := zw.CreateHeader(hdr)
+	if err != nil {
+		return err
+	}
+	_, err = f.Write(buf.Bytes())
+	return err
+}
+
+// writeZipFile 以 STORE 方式原样写入二进制附件（多为已压缩格式，重复 deflate 仅耗 CPU）
+func writeZipFile(zw *zip.Writer, name string, r io.Reader) error {
+	hdr := &zip.FileHeader{Name: name, Method: zip.Store}
+	hdr.SetMode(0o644)
+	f, err := zw.CreateHeader(hdr)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(f, r)
+	return err
+}

backend/service/library_export_test.go

@@ -0,0 +1,199 @@
+package service
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// readZipEntry 读取 ZIP 内指定名称的文件内容（不存在返回 nil, false）
+func readZipEntry(t *testing.T, zr *zip.Reader, name string) ([]byte, bool) {
+	t.Helper()
+	for _, f := range zr.File {
+		if f.Name == name {
+			rc, err := f.Open()
+			if err != nil {
+				t.Fatalf("open zip entry %s: %v", name, err)
+			}
+			defer rc.Close()
+			data, err := io.ReadAll(rc)
+			if err != nil {
+				t.Fatalf("read zip entry %s: %v", name, err)
+			}
+			return data, true
+		}
+	}
+	return nil, false
+}
+
+func buildExportZip(t *testing.T, exp *LibraryExport) *zip.Reader {
+	t.Helper()
+	var buf bytes.Buffer
+	if err := exp.WriteZip(&buf); err != nil {
+		t.Fatalf("write zip: %v", err)
+	}
+	zr, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len()))
+	if err != nil {
+		t.Fatalf("read exported zip: %v", err)
+	}
+	return zr
+}
+
+// seedBookForExport 造一本含章节（章 + 小节）、附件与本地封面的书籍
+func seedBookForExport(t *testing.T, s *LibraryService, uploads string) (docID uint, storedName string) {
+	t.Helper()
+	pub := true
+	doc, err := s.Create(&LibraryInput{Slug: "dao-jia", Title: "道家研究", Author: "老子", Description: "# 介绍"})
+	if err != nil {
+		t.Fatalf("create doc: %v", err)
+	}
+
+	coverDir := filepath.Join(uploads, "images")
+	if err := os.MkdirAll(coverDir, 0o755); err != nil {
+		t.Fatalf("mkdir uploads: %v", err)
+	}
+	coverBytes := encodeJPEGBytes(t, 120, 160)
+	if err := os.WriteFile(filepath.Join(coverDir, "cover.jpg"), coverBytes, 0o644); err != nil {
+		t.Fatalf("write cover: %v", err)
+	}
+	if _, err := s.Update(doc.ID, &LibraryInput{
+		Slug: "dao-jia", Title: "道家研究", Author: "老子", Description: "# 介绍",
+		CoverURL: "/uploads/images/cover.jpg", CoverWidth: 120, CoverHeight: 160,
+		Published: &pub,
+	}); err != nil {
+		t.Fatalf("update cover: %v", err)
+	}
+
+	chapter, err := s.CreateSection(doc.ID, &SectionInput{Title: "第一章", Content: "章正文"})
+	if err != nil {
+		t.Fatalf("create chapter: %v", err)
+	}
+	if _, err := s.CreateSection(doc.ID, &SectionInput{
+		ParentID: &chapter.ID, Title: "小节", Content: "小节正文",
+	}); err != nil {
+		t.Fatalf("create section: %v", err)
+	}
+
+	f, err := s.AddFile(doc.ID, 1, "manual.epub", bytes.NewReader([]byte("EPUB-FILE-BYTES")))
+	if err != nil {
+		t.Fatalf("add file: %v", err)
+	}
+	return doc.ID, f.StoredName
+}
+
+func TestLibraryExportBook(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	uploads := t.TempDir()
+	s.WithUploadsDir(uploads)
+	docID, storedName := seedBookForExport(t, s, uploads)
+
+	exp, err := s.BuildBookExport(docID)
+	if err != nil {
+		t.Fatalf("build export: %v", err)
+	}
+	defer exp.Close()
+	if exp.Filename != "dao-jia.zip" {
+		t.Fatalf("filename = %q, want dao-jia.zip", exp.Filename)
+	}
+	zr := buildExportZip(t, exp)
+
+	raw, ok := readZipEntry(t, zr, "book.json")
+	if !ok {
+		t.Fatal("缺少 book.json")
+	}
+	var manifest libraryExportManifest
+	if err := json.Unmarshal(raw, &manifest); err != nil {
+		t.Fatalf("parse book.json: %v", err)
+	}
+	if manifest.Format != libraryExportBookFormat || manifest.FormatVersion != libraryExportVersion {
+		t.Fatalf("清单格式异常: %s v%d", manifest.Format, manifest.FormatVersion)
+	}
+	b := manifest.Doc
+	if b == nil {
+		t.Fatal("book.json 缺少 doc")
+	}
+	if b.Title != "道家研究" || b.Slug != "dao-jia" || b.Author != "老子" || !b.Published {
+		t.Fatalf("元信息导出不正确: %+v", b)
+	}
+	if b.CoverFile != "cover.jpg" || b.CoverWidth != 120 || b.CoverHeight != 160 {
+		t.Fatalf("封面信息导出不正确: %+v", b)
+	}
+	if len(b.Sections) != 2 || b.Sections[0].Key != "s0" || b.Sections[1].ParentKey != "s0" {
+		t.Fatalf("章节树导出不正确: %+v", b.Sections)
+	}
+	if len(b.Files) != 1 || b.Files[0].Stored != "files/"+storedName || b.Files[0].Missing {
+		t.Fatalf("附件清单导出不正确: %+v", b.Files)
+	}
+
+	if data, ok := readZipEntry(t, zr, "files/"+storedName); !ok || string(data) != "EPUB-FILE-BYTES" {
+		t.Fatalf("附件内容导出不正确（ok=%v）", ok)
+	}
+	if data, ok := readZipEntry(t, zr, "cover.jpg"); !ok || !bytes.HasPrefix(data, []byte{0xff, 0xd8, 0xff}) {
+		t.Fatalf("封面内容导出不正确（ok=%v）", ok)
+	}
+	// 单本包不应出现全库索引
+	if _, ok := readZipEntry(t, zr, "library.json"); ok {
+		t.Fatal("单本包不应包含 library.json")
+	}
+}
+
+func TestLibraryExportAll(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	uploads := t.TempDir()
+	s.WithUploadsDir(uploads)
+	docID, storedName := seedBookForExport(t, s, uploads)
+	_ = docID
+
+	exp, err := s.BuildAllExport()
+	if err != nil {
+		t.Fatalf("build all export: %v", err)
+	}
+	defer exp.Close()
+	zr := buildExportZip(t, exp)
+
+	raw, ok := readZipEntry(t, zr, "library.json")
+	if !ok {
+		t.Fatal("缺少 library.json")
+	}
+	var manifest libraryExportManifest
+	if err := json.Unmarshal(raw, &manifest); err != nil {
+		t.Fatalf("parse library.json: %v", err)
+	}
+	if manifest.Format != libraryExportFormat || len(manifest.Docs) != 1 {
+		t.Fatalf("全库索引异常: %+v", manifest)
+	}
+	idx := manifest.Docs[0]
+	if idx.Dir != "docs/dao-jia/" || idx.FileCount != 1 || idx.SectionCount != 2 {
+		t.Fatalf("索引条目异常: %+v", idx)
+	}
+
+	bookRaw, ok := readZipEntry(t, zr, "docs/dao-jia/book.json")
+	if !ok {
+		t.Fatal("缺少 docs/dao-jia/book.json")
+	}
+	var book libraryExportBook
+	if err := json.Unmarshal(bookRaw, &book); err != nil {
+		t.Fatalf("parse nested book.json: %v", err)
+	}
+	if book.Slug != "dao-jia" || book.CoverFile != "cover.jpg" {
+		t.Fatalf("嵌套书籍清单异常: %+v", book)
+	}
+	if _, ok := readZipEntry(t, zr, "docs/dao-jia/files/"+storedName); !ok {
+		t.Fatal("缺少嵌套附件")
+	}
+	if _, ok := readZipEntry(t, zr, "docs/dao-jia/cover.jpg"); !ok {
+		t.Fatal("缺少嵌套封面")
+	}
+}
+
+func TestLibraryExportMissingDoc(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	if _, err := s.BuildBookExport(999); !errors.Is(err, ErrLibraryNotFound) {
+		t.Fatalf("不存在的条目应返回 ErrLibraryNotFound，got %v", err)
+	}
+}

backend/service/library_import.go

@@ -0,0 +1,631 @@
+package service
+
+// 书库导入恢复：解析导出 ZIP（见 library_export.go），在本站重建书籍。
+//
+//   - 单本包（根 book.json，format=jiang13-library-book）与全库包（library.json 索引）
+//   - mode=create（默认）：同 slug 在用条目冲突时跳过该书；软删占用同样拒绝（释放后再来）
+//   - mode=overwrite：覆盖同 slug 在用条目（章节/附件整体替换，元信息按包恢复）
+//   - 附件复用 AddFile（扩展名白名单/大小/20 个上限/随机落盘），磁盘名重新生成但保留下载计数
+//   - 内嵌封面按魔数校验后随机名落盘 uploads/images；外链封面仅保留 URL
+//   - 逐本独立处理：单本书失败不影响包内其他书，结果以报告返回（包本身非法才整体报错）
+
+import (
+	"archive/zip"
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"gorm.io/gorm"
+)
+
+// LibraryImportMaxBytes 导入 ZIP 上传上限（超出由 handler 提前拦截）
+const LibraryImportMaxBytes = 512 << 20
+
+const (
+	LibraryImportModeCreate    = "create"    // 冲突跳过
+	LibraryImportModeOverwrite = "overwrite" // 冲突覆盖
+)
+
+// 失败原因（前端据此区分冲突，可提示覆盖重导）
+const (
+	libraryImportReasonConflict = "conflict" // slug 被在用条目占用（create 模式）
+	libraryImportReasonDeleted  = "deleted"  // slug 被已软删条目占用
+	libraryImportReasonInvalid  = "invalid"  // 清单数据非法
+	libraryImportReasonFailed   = "failed"   // 落盘/写库失败
+)
+
+var (
+	ErrLibraryImportBadZip = errors.New("无法读取导入文件，请上传书库导出的 ZIP 备份包")
+	ErrLibraryImportFormat = errors.New("不是有效的书库导出包：缺少清单文件或清单已损坏")
+	ErrLibraryImportVer    = errors.New("导出版本不受支持")
+	ErrLibraryImportEmpty  = errors.New("备份包内没有可导入的书籍")
+	ErrLibraryImportMode   = errors.New("无效的导入模式")
+)
+
+// LibraryImportItem 成功导入的单本结果
+type LibraryImportItem struct {
+	Slug     string `json:"slug"`
+	Title    string `json:"title"`
+	Action   string `json:"action"` // created / overwritten
+	Sections int    `json:"sections"`
+	Files    int    `json:"files"`
+}
+
+// LibraryImportFailure 单本书失败明细
+type LibraryImportFailure struct {
+	Slug   string `json:"slug"`
+	Title  string `json:"title"`
+	Reason string `json:"reason"`
+	Error  string `json:"error"`
+}
+
+// LibraryImportReport 导入报告
+type LibraryImportReport struct {
+	Mode     string                 `json:"mode"`
+	Total    int                    `json:"total"`
+	Imported []LibraryImportItem    `json:"imported"`
+	Failed   []LibraryImportFailure `json:"failed"`
+}
+
+// bookImportPlan 单本书的导入计划（清单 + ZIP 内目录前缀）
+type bookImportPlan struct {
+	book libraryExportBook
+	dir  string
+}
+
+// plannedSection 重建后的章节（保留原始 key 用于两级映射；sort 为同层级序号）
+type plannedSection struct {
+	key       string
+	parentKey string
+	title     string
+	content   string
+	sort      int
+}
+
+// ImportLibraryZip 从导出 ZIP 恢复书籍。zipPath 为已落盘的临时文件路径。
+func (s *LibraryService) ImportLibraryZip(zipPath, mode string, userID uint) (*LibraryImportReport, error) {
+	if mode != LibraryImportModeCreate && mode != LibraryImportModeOverwrite {
+		return nil, ErrLibraryImportMode
+	}
+	zr, err := zip.OpenReader(zipPath)
+	if err != nil {
+		return nil, ErrLibraryImportBadZip
+	}
+	defer zr.Close()
+
+	entries := make(map[string]*zip.File, len(zr.File))
+	for _, f := range zr.File {
+		if f.FileInfo().IsDir() {
+			continue
+		}
+		entries[strings.ReplaceAll(f.Name, "\\", "/")] = f // 正常包无重名
+	}
+
+	plans, err := parseImportPlans(entries)
+	if err != nil {
+		return nil, err
+	}
+	if len(plans) == 0 {
+		return nil, ErrLibraryImportEmpty
+	}
+
+	rep := &LibraryImportReport{
+		Mode:     mode,
+		Total:    len(plans),
+		Imported: []LibraryImportItem{},
+		Failed:   []LibraryImportFailure{},
+	}
+	imp := &bookImporter{s: s, entries: entries, userID: userID}
+	for _, p := range plans {
+		item, fail := imp.run(p, mode)
+		if fail != nil {
+			rep.Failed = append(rep.Failed, *fail)
+		} else {
+			rep.Imported = append(rep.Imported, *item)
+		}
+	}
+	return rep, nil
+}
+
+// parseImportPlans 识别单本/全库包并解析书籍清单（不读正文/附件）
+func parseImportPlans(entries map[string]*zip.File) ([]bookImportPlan, error) {
+	if rootRaw, ok := entries["library.json"]; ok {
+		var root libraryExportManifest
+		if err := readZipJSON(rootRaw, &root); err != nil {
+			return nil, ErrLibraryImportFormat
+		}
+		if root.Format != libraryExportFormat || root.FormatVersion != libraryExportVersion {
+			return nil, ErrLibraryImportVer
+		}
+		plans := make([]bookImportPlan, 0, len(root.Docs))
+		for _, d := range root.Docs {
+			dir := strings.ReplaceAll(d.Dir, "\\", "/")
+			if !safeImportDir(dir) {
+				return nil, ErrLibraryImportFormat
+			}
+			raw, ok := entries[path.Clean(dir)+"/book.json"]
+			if !ok {
+				return nil, ErrLibraryImportFormat
+			}
+			var b libraryExportBook
+			if err := readZipJSON(raw, &b); err != nil {
+				return nil, ErrLibraryImportFormat
+			}
+			plans = append(plans, bookImportPlan{book: b, dir: dir})
+		}
+		return plans, nil
+	}
+	if rootRaw, ok := entries["book.json"]; ok {
+		var root libraryExportManifest
+		if err := readZipJSON(rootRaw, &root); err != nil {
+			return nil, ErrLibraryImportFormat
+		}
+		if root.Format != libraryExportBookFormat || root.FormatVersion != libraryExportVersion || root.Doc == nil {
+			return nil, ErrLibraryImportVer
+		}
+		return []bookImportPlan{{book: *root.Doc, dir: ""}}, nil
+	}
+	return nil, ErrLibraryImportFormat
+}
+
+// safeImportDir 全库包内目录必须是 docs/<slug>/ 形态（slug 与条目同规则）
+func safeImportDir(dir string) bool {
+	if dir == "" || !strings.HasPrefix(dir, "docs/") || !strings.HasSuffix(dir, "/") {
+		return false
+	}
+	slug := strings.TrimSuffix(strings.TrimPrefix(dir, "docs/"), "/")
+	if strings.Contains(slug, "/") || strings.Contains(slug, "..") {
+		return false
+	}
+	return sitePageSlugRe.MatchString(slug)
+}
+
+// bookImporter 携带一次批量导入的共享上下文
+type bookImporter struct {
+	s       *LibraryService
+	entries map[string]*zip.File
+	userID  uint
+}
+
+func (imp *bookImporter) fail(p bookImportPlan, reason, msg string) *LibraryImportFailure {
+	return &LibraryImportFailure{Slug: p.book.Slug, Title: p.book.Title, Reason: reason, Error: msg}
+}
+
+// run 导入单本书；返回 item 或 failure（二者互斥）
+func (imp *bookImporter) run(p bookImportPlan, mode string) (*LibraryImportItem, *LibraryImportFailure) {
+	b := p.book
+
+	in, err := buildImportInput(&b)
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonInvalid, err.Error())
+	}
+	sections, err := buildImportSections(&b)
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonInvalid, err.Error())
+	}
+	if err := imp.checkPlannedFiles(p); err != nil {
+		return nil, imp.fail(p, libraryImportReasonInvalid, err.Error())
+	}
+	coverEntry, err := imp.planCover(p)
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonInvalid, err.Error())
+	}
+
+	active, deleted, err := imp.s.slugTaken(b.Slug, 0)
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonFailed, "查询条目失败")
+	}
+
+	var docID uint
+	action := "created"
+	var oldFiles []model.LibraryFile // overwrite 时待删磁盘附件
+	var oldCoverDisk string          // overwrite 时待删旧封面（仅本地 /uploads）
+	backfillCreator := false         // overwrite 且原条目无创建者时补记导入操作人
+	switch {
+	case active && mode != LibraryImportModeOverwrite:
+		return nil, imp.fail(p, libraryImportReasonConflict, "slug 已被在用条目占用："+b.Slug)
+	case active:
+		var existing model.LibraryDoc
+		if err := imp.s.db.Where("slug = ?", b.Slug).First(&existing).Error; err != nil {
+			return nil, imp.fail(p, libraryImportReasonFailed, "读取原条目失败")
+		}
+		docID = existing.ID
+		// 跨站恢复不导出创建者：原条目无创建者时把本次导入操作人补为创建者
+		backfillCreator = existing.CreatorID == 0
+		_ = imp.s.db.Where("doc_id = ?", docID).Find(&oldFiles).Error
+		if disk, ok := imp.s.resolveCoverPath(existing.CoverURL); ok {
+			oldCoverDisk = disk
+		}
+		action = "overwritten"
+	case deleted:
+		return nil, imp.fail(p, libraryImportReasonDeleted,
+			"该地址被已删除条目占用，请先在书库管理中彻底删除后再导入："+b.Slug)
+	}
+
+	// 内嵌封面先落盘（URL 在事务前确定；create 失败时随条目回滚删除）
+	coverDisk := ""
+	if coverEntry != nil {
+		url, w, h, disk, ferr := imp.materializeCover(coverEntry)
+		if ferr != nil {
+			return nil, imp.fail(p, libraryImportReasonFailed, "封面恢复失败："+ferr.Error())
+		}
+		in.CoverURL, in.CoverWidth, in.CoverHeight, coverDisk = url, w, h, disk
+	}
+	// 无内嵌封面时保留清单原值（外链或原站 /uploads URL）与尺寸
+
+	txErr := imp.s.db.Transaction(func(tx *gorm.DB) error {
+		if action == "created" {
+			d := &model.LibraryDoc{Published: false, SortOrder: 0, CreatorID: imp.userID}
+			in.applyTo(d)
+			if err := tx.Select(libraryDocWriteFields).Create(d).Error; err != nil {
+				return err
+			}
+			docID = d.ID
+		} else {
+			var d model.LibraryDoc
+			if err := tx.First(&d, docID).Error; err != nil {
+				return err
+			}
+			in.applyTo(&d)
+			updates := map[string]interface{}{
+				"slug":         d.Slug,
+				"title":        d.Title,
+				"author":       d.Author,
+				"description":  d.Description,
+				"cover_url":    d.CoverURL,
+				"cover_width":  d.CoverWidth,
+				"cover_height": d.CoverHeight,
+				"published":    d.Published,
+				"sort_order":   d.SortOrder,
+				"entries_auto": d.EntriesAuto,
+			}
+			if backfillCreator {
+				updates["creator_id"] = imp.userID
+			}
+			if err := tx.Model(&model.LibraryDoc{}).Where("id = ?", d.ID).Updates(updates).Error; err != nil {
+				return err
+			}
+			if err := tx.Unscoped().Where("doc_id = ?", docID).Delete(&model.LibrarySection{}).Error; err != nil {
+				return err
+			}
+			if err := tx.Unscoped().Where("doc_id = ?", docID).Delete(&model.LibraryFile{}).Error; err != nil {
+				return err
+			}
+		}
+		return imp.createSections(tx, docID, sections)
+	})
+	if txErr != nil {
+		if action == "created" && coverDisk != "" {
+			_ = os.Remove(coverDisk)
+		}
+		return nil, imp.fail(p, libraryImportReasonFailed, "写入数据库失败："+txErr.Error())
+	}
+
+	// overwrite 事务成功后清理旧附件与旧封面磁盘文件（失败不影响结果）
+	for i := range oldFiles {
+		_ = os.Remove(imp.s.FilePath(&oldFiles[i]))
+	}
+	if oldCoverDisk != "" && oldCoverDisk != coverDisk {
+		_ = os.Remove(oldCoverDisk)
+	}
+
+	// 附件落盘。create 阶段失败需硬删新建条目以释放 slug；overwrite 仅报告失败
+	added := 0
+	var newFiles []model.LibraryFile
+	for _, mf := range b.Files {
+		if mf.Missing || mf.Stored == "" {
+			continue // 导出时磁盘已丢失的附件：清单保留记录但无文件可恢复
+		}
+		f, fail := imp.addPlannedFile(p, docID, mf)
+		if fail != nil {
+			if action == "created" {
+				imp.rollbackCreated(docID, newFiles, coverDisk)
+			}
+			return nil, fail
+		}
+		newFiles = append(newFiles, *f)
+		added++
+	}
+
+	return &LibraryImportItem{
+		Slug:     b.Slug,
+		Title:    b.Title,
+		Action:   action,
+		Sections: len(sections),
+		Files:    added,
+	}, nil
+}
+
+// ---------- 清单解析与预检 ----------
+
+func buildImportInput(b *libraryExportBook) (*LibraryInput, error) {
+	pub, sortOrder, entriesAuto := b.Published, b.SortOrder, b.EntriesAuto
+	in := &LibraryInput{
+		Slug:        b.Slug,
+		Title:       b.Title,
+		Author:      b.Author,
+		Description: b.Description,
+		CoverURL:    b.CoverURL,
+		CoverWidth:  b.CoverWidth,
+		CoverHeight: b.CoverHeight,
+		Published:   &pub,
+		SortOrder:   &sortOrder,
+		EntriesAuto: &entriesAuto,
+	}
+	if err := in.normalize(); err != nil {
+		return nil, err
+	}
+	return in, nil
+}
+
+// buildImportSections 两轮解析：先章（编号）后节（按父分组编号），校验标题/正文/父引用
+func buildImportSections(b *libraryExportBook) ([]plannedSection, error) {
+	if len(b.Sections) > MaxSectionsPerDoc {
+		return nil, errors.New("章节数量超过上限（最多 200）")
+	}
+	keySeen := map[string]bool{}
+	out := make([]plannedSection, 0, len(b.Sections))
+
+	chapterSort := map[string]int{}
+	order := 0
+	for _, sec := range b.Sections {
+		if sec.ParentKey != "" {
+			continue
+		}
+		title := strings.TrimSpace(sec.Title)
+		if title == "" {
+			return nil, errors.New("存在标题为空的章节")
+		}
+		if err := validateSectionText(title, sec.Content); err != nil {
+			return nil, err
+		}
+		if keySeen[sec.Key] {
+			return nil, errors.New("章节标识重复：" + sec.Key)
+		}
+		keySeen[sec.Key] = true
+		chapterSort[sec.Key] = order
+		out = append(out, plannedSection{
+			key: sec.Key, title: title, content: sec.Content, sort: order,
+		})
+		order++
+	}
+
+	childCount := map[string]int{}
+	for _, sec := range b.Sections {
+		if sec.ParentKey == "" {
+			continue
+		}
+		if _, ok := chapterSort[sec.ParentKey]; !ok {
+			return nil, errors.New("小节「" + strings.TrimSpace(sec.Title) + "」找不到所属章节")
+		}
+		title := strings.TrimSpace(sec.Title)
+		if title == "" {
+			return nil, errors.New("存在标题为空的小节")
+		}
+		if err := validateSectionText(title, sec.Content); err != nil {
+			return nil, err
+		}
+		out = append(out, plannedSection{
+			key:       sec.Key,
+			parentKey: sec.ParentKey,
+			title:     title,
+			content:   sec.Content,
+			sort:      childCount[sec.ParentKey],
+		})
+		childCount[sec.ParentKey]++
+	}
+	return out, nil
+}
+
+func validateSectionText(title, content string) error {
+	if len([]rune(title)) > 200 {
+		return errors.New("章节标题不能超过 200 字：" + title)
+	}
+	if len([]rune(content)) > MaxSectionContent {
+		return errors.New("章节正文不能超过 100000 字：" + title)
+	}
+	return nil
+}
+
+// checkPlannedFiles 预检附件：数量、扩展名、ZIP 路径、声明大小、包内是否存在
+func (imp *bookImporter) checkPlannedFiles(p bookImportPlan) error {
+	if len(p.book.Files) > MaxLibraryFilesPerDoc {
+		return errors.New("附件数量超过上限（最多 20 个）")
+	}
+	maxB := imp.s.maxBytes()
+	for _, f := range p.book.Files {
+		if f.Missing || f.Stored == "" {
+			continue
+		}
+		rel, ok := cleanZipRel(f.Stored)
+		if !ok || !strings.HasPrefix(rel, "files/") {
+			return errors.New("附件路径非法：" + f.Stored)
+		}
+		name := sanitizeFilename(f.Name)
+		if name == "" || !LibraryExtAllowed(ExtOfFilename(name)) {
+			return errors.New("附件格式不受支持：" + f.Name)
+		}
+		zf, ok := imp.entries[p.dir+rel]
+		if !ok {
+			return errors.New("备份包缺少附件文件：" + f.Name)
+		}
+		if zf.UncompressedSize64 > uint64(maxB) {
+			return errors.New("附件超过大小上限：" + f.Name)
+		}
+	}
+	return nil
+}
+
+// planCover 返回内嵌封面 ZIP 条目（无则 nil）
+func (imp *bookImporter) planCover(p bookImportPlan) (*zip.File, error) {
+	cf := strings.TrimSpace(p.book.CoverFile)
+	if cf == "" {
+		return nil, nil
+	}
+	rel, ok := cleanZipRel(cf)
+	if !ok || strings.Contains(rel, "/") {
+		return nil, errors.New("封面路径非法：" + cf)
+	}
+	zf, ok := imp.entries[p.dir+rel]
+	if !ok {
+		return nil, errors.New("备份包缺少封面文件")
+	}
+	if zf.UncompressedSize64 > uint64(ImageMaxBytes) {
+		return nil, errors.New("封面不能超过 5MB")
+	}
+	return zf, nil
+}
+
+// ---------- 落盘 ----------
+
+// createSections 两趟写入：先建章（key→新ID），再建节（父引用映射后的章 ID）
+func (imp *bookImporter) createSections(tx *gorm.DB, docID uint, sections []plannedSection) error {
+	keyToID := make(map[string]uint, len(sections))
+	for i := range sections {
+		ps := &sections[i]
+		if ps.parentKey != "" {
+			continue
+		}
+		sec := &model.LibrarySection{DocID: docID, Title: ps.title, Content: ps.content, SortOrder: ps.sort}
+		if err := tx.Create(sec).Error; err != nil {
+			return err
+		}
+		keyToID[ps.key] = sec.ID
+	}
+	for i := range sections {
+		ps := &sections[i]
+		if ps.parentKey == "" {
+			continue
+		}
+		parentID, ok := keyToID[ps.parentKey]
+		if !ok {
+			return errors.New("小节找不到所属章节")
+		}
+		sec := &model.LibrarySection{
+			DocID: docID, ParentID: &parentID,
+			Title: ps.title, Content: ps.content, SortOrder: ps.sort,
+		}
+		if err := tx.Create(sec).Error; err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// addPlannedFile 从 ZIP 读取附件并复用 AddFile 落盘，随后恢复下载计数与排序
+func (imp *bookImporter) addPlannedFile(
+	p bookImportPlan, docID uint, mf libraryExportFile,
+) (*model.LibraryFile, *LibraryImportFailure) {
+	rel, _ := cleanZipRel(mf.Stored)
+	zf, ok := imp.entries[p.dir+rel]
+	if !ok {
+		return nil, imp.fail(p, libraryImportReasonFailed, "备份包缺少附件文件："+mf.Name)
+	}
+	rc, err := zf.Open()
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonFailed, "读取附件失败："+mf.Name)
+	}
+	defer rc.Close()
+	f, err := imp.s.AddFile(docID, imp.userID, mf.Name, io.LimitReader(rc, imp.s.maxBytes()+1))
+	if err != nil {
+		return nil, imp.fail(p, libraryImportReasonFailed, "附件恢复失败「"+mf.Name+"」："+err.Error())
+	}
+	if err := imp.s.db.Model(&model.LibraryFile{}).Where("id = ?", f.ID).
+		UpdateColumns(map[string]interface{}{
+			"download_count": mf.DownloadCount,
+			"sort_order":     mf.SortOrder,
+		}).Error; err != nil {
+		return nil, imp.fail(p, libraryImportReasonFailed, "附件信息写入失败："+mf.Name)
+	}
+	return f, nil
+}
+
+// materializeCover 校验图片魔数后以随机名落盘 uploads/images，返回 URL/尺寸/磁盘路径
+func (imp *bookImporter) materializeCover(zf *zip.File) (string, int, int, string, error) {
+	if imp.s.uploadsDir == "" {
+		return "", 0, 0, "", errors.New("未配置上传目录")
+	}
+	rc, err := zf.Open()
+	if err != nil {
+		return "", 0, 0, "", err
+	}
+	defer rc.Close()
+	data, err := io.ReadAll(io.LimitReader(rc, ImageMaxBytes+1))
+	if err != nil {
+		return "", 0, 0, "", err
+	}
+	if int64(len(data)) > ImageMaxBytes {
+		return "", 0, 0, "", errors.New("封面不能超过 5MB")
+	}
+	format, err := detectImageFormat(data)
+	if err != nil {
+		return "", 0, 0, "", err
+	}
+	width, height, err := decodeImageSizeReader(bytes.NewReader(data), format.mime)
+	if err != nil || width < 1 || height < 1 {
+		return "", 0, 0, "", errors.New("无法解析封面图片")
+	}
+	if width > ImageMaxDim || height > ImageMaxDim {
+		return "", 0, 0, "", errors.New("封面边长不能超过 4096px")
+	}
+	nameBytes := make([]byte, 16)
+	if _, err := rand.Read(nameBytes); err != nil {
+		return "", 0, 0, "", err
+	}
+	filename := hex.EncodeToString(nameBytes) + format.ext
+	imagesDir := filepath.Join(imp.s.uploadsDir, "images")
+	if err := os.MkdirAll(imagesDir, 0o755); err != nil {
+		return "", 0, 0, "", err
+	}
+	full := filepath.Join(imagesDir, filename)
+	if err := os.WriteFile(full, data, 0o644); err != nil {
+		return "", 0, 0, "", err
+	}
+	return "/uploads/images/" + filename, width, height, full, nil
+}
+
+// rollbackCreated create 模式落盘阶段失败：硬删条目/章节/文件行与已落盘文件，释放 slug
+func (imp *bookImporter) rollbackCreated(docID uint, newFiles []model.LibraryFile, coverDisk string) {
+	_ = imp.s.db.Unscoped().Where("doc_id = ?", docID).Delete(&model.LibrarySection{}).Error
+	_ = imp.s.db.Unscoped().Where("doc_id = ?", docID).Delete(&model.LibraryFile{}).Error
+	_ = imp.s.db.Unscoped().Delete(&model.LibraryDoc{}, docID).Error
+	for i := range newFiles {
+		_ = os.Remove(imp.s.FilePath(&newFiles[i]))
+	}
+	if coverDisk != "" {
+		_ = os.Remove(coverDisk)
+	}
+}
+
+// ---------- ZIP 工具 ----------
+
+// cleanZipRel 校验 ZIP 内相对路径：拒绝绝对路径与任何 ../ 穿越段
+func cleanZipRel(rel string) (string, bool) {
+	p := path.Clean(strings.ReplaceAll(strings.TrimSpace(rel), "\\", "/"))
+	if p == "." || p == "" || path.IsAbs(p) || p == ".." {
+		return "", false
+	}
+	for _, seg := range strings.Split(p, "/") {
+		if seg == ".." {
+			return "", false
+		}
+	}
+	return p, true
+}
+
+func readZipJSON(zf *zip.File, v any) error {
+	rc, err := zf.Open()
+	if err != nil {
+		return err
+	}
+	defer rc.Close()
+	return json.NewDecoder(rc).Decode(v)
+}

backend/service/library_import_test.go

@@ -0,0 +1,354 @@
+package service
+
+import (
+	"archive/zip"
+	"bytes"
+	"errors"
+	"image"
+	"image/jpeg"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/freefire/jiang13-bbs/model"
+)
+
+func encodeJPEGBytes(t *testing.T, w, h int) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	if err := jpeg.Encode(&buf, image.NewRGBA(image.Rect(0, 0, w, h)), &jpeg.Options{Quality: 80}); err != nil {
+		t.Fatalf("encode jpeg: %v", err)
+	}
+	return buf.Bytes()
+}
+
+// writeExportZipFile 把内存导出包落盘为临时 zip（模拟 handler 上传后的临时文件）
+func writeExportZipFile(t *testing.T, exp *LibraryExport) string {
+	t.Helper()
+	p := filepath.Join(t.TempDir(), "export.zip")
+	f, err := os.Create(p)
+	if err != nil {
+		t.Fatalf("create temp zip: %v", err)
+	}
+	if err := exp.WriteZip(f); err != nil {
+		t.Fatalf("write export zip: %v", err)
+	}
+	if err := f.Close(); err != nil {
+		t.Fatalf("close temp zip: %v", err)
+	}
+	return p
+}
+
+// writeZipFileMap 手工构造 ZIP（用于非法包测试）
+func writeZipFileMap(t *testing.T, entries map[string]string) string {
+	t.Helper()
+	buf := new(bytes.Buffer)
+	zw := zip.NewWriter(buf)
+	for name, content := range entries {
+		w, err := zw.Create(name)
+		if err != nil {
+			t.Fatalf("zip create %s: %v", name, err)
+		}
+		if _, err := io.WriteString(w, content); err != nil {
+			t.Fatalf("zip write %s: %v", name, err)
+		}
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatalf("zip close: %v", err)
+	}
+	p := filepath.Join(t.TempDir(), "in.zip")
+	if err := os.WriteFile(p, buf.Bytes(), 0o644); err != nil {
+		t.Fatalf("write temp zip: %v", err)
+	}
+	return p
+}
+
+func assertReportOK(t *testing.T, rep *LibraryImportReport, total int) {
+	t.Helper()
+	if rep == nil {
+		t.Fatal("报告为空")
+	}
+	if rep.Total != total {
+		t.Fatalf("total = %d, want %d", rep.Total, total)
+	}
+	if len(rep.Failed) != 0 {
+		t.Fatalf("存在失败记录: %+v", rep.Failed)
+	}
+	if len(rep.Imported) != total {
+		t.Fatalf("imported = %d, want %d", len(rep.Imported), total)
+	}
+}
+
+// TestLibraryImportBookRoundTrip 单本包：导出 → 导入 → 冲突跳过 → 覆盖导入
+func TestLibraryImportBookRoundTrip(t *testing.T) {
+	// ---- 源库 ----
+	src, _ := newLibraryTestService(t)
+	srcUploads := t.TempDir()
+	src.WithUploadsDir(srcUploads)
+	docID, storedName := seedBookForExport(t, src, srcUploads)
+
+	// 制造两次下载，验证计数随包保留
+	var srcFile model.LibraryFile
+	if err := src.db.Where("stored_name = ?", storedName).First(&srcFile).Error; err != nil {
+		t.Fatalf("find source file: %v", err)
+	}
+	src.IncrDownload(srcFile.ID)
+	src.IncrDownload(srcFile.ID)
+
+	exp, err := src.BuildBookExport(docID)
+	if err != nil {
+		t.Fatalf("build export: %v", err)
+	}
+	zipPath := writeExportZipFile(t, exp)
+	exp.Close()
+
+	// ---- 目标库（空库）----
+	dst, _ := newLibraryTestService(t)
+	dstUploads := t.TempDir()
+	dst.WithUploadsDir(dstUploads)
+
+	// 1) create 导入
+	rep, err := dst.ImportLibraryZip(zipPath, LibraryImportModeCreate, 7)
+	if err != nil {
+		t.Fatalf("import: %v", err)
+	}
+	assertReportOK(t, rep, 1)
+	item := rep.Imported[0]
+	if item.Slug != "dao-jia" || item.Action != "created" || item.Sections != 2 || item.Files != 1 {
+		t.Fatalf("导入条目异常: %+v", item)
+	}
+
+	var doc model.LibraryDoc
+	if err := dst.db.Where("slug = ?", "dao-jia").First(&doc).Error; err != nil {
+		t.Fatalf("find imported doc: %v", err)
+	}
+	if doc.Title != "道家研究" || doc.Description != "# 介绍" || !doc.Published {
+		t.Fatalf("元信息恢复不正确: %+v", doc)
+	}
+	if doc.Author != "老子" {
+		t.Fatalf("作者恢复不正确: %q", doc.Author)
+	}
+	if doc.CreatorID != 7 {
+		t.Fatalf("新建导入创建者应为导入操作人，got %d", doc.CreatorID)
+	}
+	if !strings.HasPrefix(doc.CoverURL, "/uploads/images/") || doc.CoverURL == "/uploads/images/cover.jpg" {
+		t.Fatalf("封面 URL 应为重新落盘的随机名，got %q", doc.CoverURL)
+	}
+	if doc.CoverWidth != 120 || doc.CoverHeight != 160 {
+		t.Fatalf("封面尺寸恢复不正确: %dx%d", doc.CoverWidth, doc.CoverHeight)
+	}
+	coverDisk, ok := dst.resolveCoverPath(doc.CoverURL)
+	if !ok {
+		t.Fatalf("封面路径无法解析: %s", doc.CoverURL)
+	}
+	coverData, err := os.ReadFile(coverDisk)
+	if err != nil {
+		t.Fatalf("封面未落盘: %v", err)
+	}
+	if !bytes.HasPrefix(coverData, []byte{0xff, 0xd8, 0xff}) {
+		t.Fatal("封面内容不是 JPEG")
+	}
+
+	// 章节树：章 + 小节父子关系
+	secs, err := dst.ListSections(doc.ID)
+	if err != nil {
+		t.Fatalf("list sections: %v", err)
+	}
+	if len(secs) != 2 {
+		t.Fatalf("章节数 = %d, want 2", len(secs))
+	}
+	var chapter, child *model.LibrarySection
+	for i := range secs {
+		if secs[i].ParentID == nil {
+			chapter = &secs[i]
+		} else {
+			child = &secs[i]
+		}
+	}
+	if chapter == nil || child == nil {
+		t.Fatalf("章节层级不正确: %+v", secs)
+	}
+	if chapter.Title != "第一章" || chapter.SortOrder != 0 {
+		t.Fatalf("章信息不正确: %+v", chapter)
+	}
+	if child.Title != "小节" || *child.ParentID != chapter.ID || child.SortOrder != 0 {
+		t.Fatalf("小节信息不正确: %+v", child)
+	}
+
+	// 附件：重新随机落盘、内容与下载计数保留
+	var files []model.LibraryFile
+	if err := dst.db.Where("doc_id = ?", doc.ID).Find(&files).Error; err != nil {
+		t.Fatalf("list files: %v", err)
+	}
+	if len(files) != 1 {
+		t.Fatalf("附件数 = %d, want 1", len(files))
+	}
+	nf := files[0]
+	if nf.Name != "manual.epub" || nf.DownloadCount != 2 || nf.StoredName == srcFile.StoredName {
+		t.Fatalf("附件恢复不正确: %+v", nf)
+	}
+	data, err := os.ReadFile(dst.FilePath(&nf))
+	if err != nil {
+		t.Fatalf("附件未落盘: %v", err)
+	}
+	if string(data) != "EPUB-FILE-BYTES" {
+		t.Fatalf("附件内容不正确: %q", data)
+	}
+	firstCoverURL := doc.CoverURL
+
+	// 2) 再次 create：冲突跳过
+	rep2, err := dst.ImportLibraryZip(zipPath, LibraryImportModeCreate, 7)
+	if err != nil {
+		t.Fatalf("re-import: %v", err)
+	}
+	if rep2.Total != 1 || len(rep2.Imported) != 0 || len(rep2.Failed) != 1 {
+		t.Fatalf("冲突报告异常: %+v", rep2)
+	}
+	if rep2.Failed[0].Reason != libraryImportReasonConflict {
+		t.Fatalf("失败原因应为 conflict，got %q", rep2.Failed[0].Reason)
+	}
+	var docCount int64
+	dst.db.Model(&model.LibraryDoc{}).Count(&docCount)
+	if docCount != 1 {
+		t.Fatalf("冲突跳过后书库数量异常: %d", docCount)
+	}
+
+	// 3) overwrite：先加一个计划外附件与旧封面，导入后应被整体替换
+	extra, err := dst.AddFile(doc.ID, 7, "extra.txt", bytes.NewReader([]byte("EXTRA-BYTES")))
+	if err != nil {
+		t.Fatalf("add extra: %v", err)
+	}
+	extraPath := dst.FilePath(extra)
+	if _, err := os.Stat(extraPath); err != nil {
+		t.Fatalf("extra 未先落盘: %v", err)
+	}
+
+	rep3, err := dst.ImportLibraryZip(zipPath, LibraryImportModeOverwrite, 7)
+	if err != nil {
+		t.Fatalf("overwrite import: %v", err)
+	}
+	assertReportOK(t, rep3, 1)
+	if rep3.Imported[0].Action != "overwritten" {
+		t.Fatalf("动作应为 overwritten，got %q", rep3.Imported[0].Action)
+	}
+
+	dst.db.Model(&model.LibraryDoc{}).Count(&docCount)
+	if docCount != 1 {
+		t.Fatalf("覆盖后书库数量异常: %d", docCount)
+	}
+	var doc2 model.LibraryDoc
+	if err := dst.db.Where("slug = ?", "dao-jia").First(&doc2).Error; err != nil {
+		t.Fatalf("find overwritten doc: %v", err)
+	}
+	if secs2, err := dst.ListSections(doc2.ID); err != nil || len(secs2) != 2 {
+		t.Fatalf("覆盖后章节异常: %d %v", len(secs2), err)
+	}
+	if doc2.Author != "老子" || doc2.CreatorID != 7 {
+		t.Fatalf("覆盖后作者/创建者异常: author=%q creator=%d", doc2.Author, doc2.CreatorID)
+	}
+	var files2 []model.LibraryFile
+	if err := dst.db.Where("doc_id = ?", doc2.ID).Find(&files2).Error; err != nil || len(files2) != 1 {
+		t.Fatalf("覆盖后附件数量异常: %d %v", len(files2), err)
+	}
+	if files2[0].Name != "manual.epub" || files2[0].DownloadCount != 2 {
+		t.Fatalf("覆盖后附件内容异常: %+v", files2[0])
+	}
+	if _, err := os.Stat(extraPath); !os.IsNotExist(err) {
+		t.Fatalf("旧附件磁盘文件应被删除，err=%v", err)
+	}
+	oldCoverDisk, _ := dst.resolveCoverPath(firstCoverURL)
+	if _, err := os.Stat(oldCoverDisk); !os.IsNotExist(err) {
+		t.Fatalf("旧封面磁盘文件应被删除，err=%v", err)
+	}
+	if doc2.CoverURL == firstCoverURL {
+		t.Fatal("覆盖后封面应重新落盘为新文件")
+	}
+	newCoverDisk, _ := dst.resolveCoverPath(doc2.CoverURL)
+	if _, err := os.ReadFile(newCoverDisk); err != nil {
+		t.Fatalf("新封面未落盘: %v", err)
+	}
+}
+
+// TestLibraryImportAll 全库包往返
+func TestLibraryImportAll(t *testing.T) {
+	src, _ := newLibraryTestService(t)
+	srcUploads := t.TempDir()
+	src.WithUploadsDir(srcUploads)
+	if _, err := src.Create(&LibraryInput{Slug: "second-book", Title: "第二本"}); err != nil {
+		t.Fatalf("create second doc: %v", err)
+	}
+	seedBookForExport(t, src, srcUploads)
+
+	exp, err := src.BuildAllExport()
+	if err != nil {
+		t.Fatalf("build all export: %v", err)
+	}
+	zipPath := writeExportZipFile(t, exp)
+	exp.Close()
+
+	dst, _ := newLibraryTestService(t)
+	dst.WithUploadsDir(t.TempDir())
+	rep, err := dst.ImportLibraryZip(zipPath, LibraryImportModeCreate, 1)
+	if err != nil {
+		t.Fatalf("import all: %v", err)
+	}
+	assertReportOK(t, rep, 2)
+	slugs := map[string]bool{}
+	for _, it := range rep.Imported {
+		slugs[it.Slug] = true
+	}
+	if !slugs["dao-jia"] || !slugs["second-book"] {
+		t.Fatalf("导入书集不正确: %+v", slugs)
+	}
+}
+
+// TestLibraryImportRejectBadPackage 非法包整体拒绝
+func TestLibraryImportRejectBadPackage(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	s.WithUploadsDir(t.TempDir())
+
+	badPath := filepath.Join(t.TempDir(), "bad.zip")
+	if err := os.WriteFile(badPath, []byte("this is not a zip"), 0o644); err != nil {
+		t.Fatalf("write: %v", err)
+	}
+	if _, err := s.ImportLibraryZip(badPath, LibraryImportModeCreate, 1); !errors.Is(err, ErrLibraryImportBadZip) {
+		t.Fatalf("非 zip 应返回 ErrLibraryImportBadZip，got %v", err)
+	}
+
+	noManifest := writeZipFileMap(t, map[string]string{"files/a.epub": "x"})
+	if _, err := s.ImportLibraryZip(noManifest, LibraryImportModeCreate, 1); !errors.Is(err, ErrLibraryImportFormat) {
+		t.Fatalf("缺清单应返回 ErrLibraryImportFormat，got %v", err)
+	}
+
+	if _, err := s.ImportLibraryZip(badPath, "bogus", 1); !errors.Is(err, ErrLibraryImportMode) {
+		t.Fatalf("非法模式应返回 ErrLibraryImportMode，got %v", err)
+	}
+}
+
+// TestCleanZipRel 路径穿越校验
+func TestCleanZipRel(t *testing.T) {
+	cases := []struct {
+		in   string
+		want bool
+	}{
+		{"", false},
+		{".", false},
+		{"..", false},
+		{"../evil", false},
+		{"a/../../b", false},
+		{"/etc/passwd", false},
+		{`docs\..\..\x`, false},
+		{"files/a.epub", true},
+		{"docs/x/book.json", true},
+		{`docs\x/cover.jpg`, true},
+		{"a//b", true},
+	}
+	for _, tc := range cases {
+		_, ok := cleanZipRel(tc.in)
+		if ok != tc.want {
+			t.Errorf("cleanZipRel(%q) = %v, want %v", tc.in, ok, tc.want)
+		}
+	}
+}

backend/service/library_section.go

@@ -0,0 +1,422 @@
+package service
+
+import (
+	"errors"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"gorm.io/gorm"
+)
+
+// 章节约束：两级树（章 → 节），正文为 markdown
+const (
+	MaxSectionsPerDoc   = 200      // 单条目章+节总数上限
+	MaxSectionContent   = 100_000  // 单章节正文字符上限
+	MaxImportBytes      = 5 << 20  // 单个 md 文件字节上限（5MB）
+	MaxImportFiles      = 50       // 单次批量导入文件数上限
+	MaxImportTotalBytes = 20 << 20 // 批量导入总字节上限（20MB）
+)
+
+var ErrSectionNotFound = errors.New("章节不存在")
+
+// SectionInput 创建/更新章节入参（更新仅改标题与正文，父子关系由创建时决定、顺序用 move 调整）
+type SectionInput struct {
+	ParentID *uint  `json:"parent_id"`
+	Title    string `json:"title"`
+	Content  string `json:"content"`
+}
+
+func (in *SectionInput) normalize() error {
+	if in.ParentID != nil && *in.ParentID == 0 {
+		in.ParentID = nil
+	}
+	in.Title = strings.TrimSpace(in.Title)
+	if in.Title == "" {
+		return errors.New("章节标题不能为空")
+	}
+	if utf8.RuneCountInString(in.Title) > 200 {
+		return errors.New("章节标题不能超过 200 字")
+	}
+	if utf8.RuneCountInString(in.Content) > MaxSectionContent {
+		return errors.New("章节正文不能超过 100000 字")
+	}
+	return nil
+}
+
+func (s *LibraryService) section(id uint) (*model.LibrarySection, error) {
+	var sec model.LibrarySection
+	if err := s.db.First(&sec, id).Error; err != nil {
+		return nil, ErrSectionNotFound
+	}
+	return &sec, nil
+}
+
+func (s *LibraryService) sectionCount(docID uint) (int64, error) {
+	var n int64
+	if err := s.db.Model(&model.LibrarySection{}).Where("doc_id = ?", docID).Count(&n).Error; err != nil {
+		return 0, err
+	}
+	return n, nil
+}
+
+// sectionMaxSort 同级兄弟的当前最大 sort_order（无兄弟时 -1）
+func (s *LibraryService) sectionMaxSort(docID uint, parentID *uint) (int, error) {
+	q := s.db.Model(&model.LibrarySection{}).Where("doc_id = ?", docID)
+	if parentID == nil {
+		q = q.Where("parent_id IS NULL")
+	} else {
+		q = q.Where("parent_id = ?", *parentID)
+	}
+	var maxSort int
+	if err := q.Select("COALESCE(MAX(sort_order), -1)").Scan(&maxSort).Error; err != nil {
+		return 0, err
+	}
+	return maxSort, nil
+}
+
+// ListSections 条目下全部章节（平铺，章在前节按组内序）
+func (s *LibraryService) ListSections(docID uint) ([]model.LibrarySection, error) {
+	var secs []model.LibrarySection
+	if err := s.db.Where("doc_id = ?", docID).
+		Order("sort_order ASC, id ASC").Find(&secs).Error; err != nil {
+		return nil, err
+	}
+	return secs, nil
+}
+
+// validateParent 两级约束：父必须是同条目下的章（自身不能是节）
+func (s *LibraryService) validateParent(docID uint, parentID *uint) error {
+	if parentID == nil {
+		return nil
+	}
+	parent, err := s.section(*parentID)
+	if err != nil {
+		return errors.New("父章节不存在")
+	}
+	if parent.DocID != docID {
+		return errors.New("父章节不属于该条目")
+	}
+	if parent.ParentID != nil {
+		return errors.New("目录最多两级：章下不能再建小节")
+	}
+	return nil
+}
+
+func (s *LibraryService) CreateSection(docID uint, in *SectionInput) (*model.LibrarySection, error) {
+	if err := in.normalize(); err != nil {
+		return nil, err
+	}
+	var doc model.LibraryDoc
+	if err := s.db.First(&doc, docID).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	if err := s.validateParent(docID, in.ParentID); err != nil {
+		return nil, err
+	}
+	count, err := s.sectionCount(docID)
+	if err != nil {
+		return nil, err
+	}
+	if count >= MaxSectionsPerDoc {
+		return nil, errors.New("章节数量超过上限")
+	}
+	maxSort, err := s.sectionMaxSort(docID, in.ParentID)
+	if err != nil {
+		return nil, err
+	}
+	sec := &model.LibrarySection{
+		DocID:     docID,
+		ParentID:  in.ParentID,
+		Title:     in.Title,
+		Content:   in.Content,
+		SortOrder: maxSort + 1,
+	}
+	if err := s.db.Create(sec).Error; err != nil {
+		return nil, err
+	}
+	return sec, nil
+}
+
+// UpdateSection 更新标题与正文（父章节与顺序不变）
+func (s *LibraryService) UpdateSection(id uint, in *SectionInput) (*model.LibrarySection, error) {
+	in.ParentID = nil // 忽略传入的 parent：父子关系不在此处变更
+	if err := in.normalize(); err != nil {
+		return nil, err
+	}
+	sec, err := s.section(id)
+	if err != nil {
+		return nil, err
+	}
+	if err := s.db.Model(sec).Updates(map[string]interface{}{
+		"title":   in.Title,
+		"content": in.Content,
+	}).Error; err != nil {
+		return nil, err
+	}
+	return s.section(id)
+}
+
+// DeleteSection 删除章节；若为章则级联软删其下小节
+func (s *LibraryService) DeleteSection(id uint) error {
+	sec, err := s.section(id)
+	if err != nil {
+		return err
+	}
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		if sec.ParentID == nil {
+			if err := tx.Where("parent_id = ?", sec.ID).Delete(&model.LibrarySection{}).Error; err != nil {
+				return err
+			}
+		}
+		return tx.Delete(sec).Error
+	})
+}
+
+// MoveSection 与同父相邻兄弟交换 sort_order（边界为 no-op）
+func (s *LibraryService) MoveSection(id uint, direction string) error {
+	if direction != "up" && direction != "down" {
+		return errors.New("无效的移动方向")
+	}
+	sec, err := s.section(id)
+	if err != nil {
+		return err
+	}
+	q := s.db.Where("doc_id = ?", sec.DocID)
+	if sec.ParentID == nil {
+		q = q.Where("parent_id IS NULL")
+	} else {
+		q = q.Where("parent_id = ?", *sec.ParentID)
+	}
+	var sibs []model.LibrarySection
+	if err := q.Order("sort_order ASC, id ASC").Find(&sibs).Error; err != nil {
+		return err
+	}
+	idx := -1
+	for i := range sibs {
+		if sibs[i].ID == sec.ID {
+			idx = i
+			break
+		}
+	}
+	if idx < 0 {
+		return ErrSectionNotFound
+	}
+	var other *model.LibrarySection
+	if direction == "up" && idx > 0 {
+		other = &sibs[idx-1]
+	}
+	if direction == "down" && idx < len(sibs)-1 {
+		other = &sibs[idx+1]
+	}
+	if other == nil {
+		return nil // 已在边界，无需移动
+	}
+	a, b := sec.SortOrder, other.SortOrder
+	if a == b {
+		b = a + 1 // 相同排序值时保证交换后顺序确实变化
+	}
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Model(&model.LibrarySection{}).Where("id = ?", sec.ID).
+			UpdateColumn("sort_order", b).Error; err != nil {
+			return err
+		}
+		return tx.Model(&model.LibrarySection{}).Where("id = ?", other.ID).
+			UpdateColumn("sort_order", a).Error
+	})
+}
+
+// ---------- md 拆章导入 ----------
+
+type mdChapterChunk struct {
+	Title string
+	Body  string
+}
+
+// splitMarkdownChapters 按指定级别标题（"# " 或 "## "）切块；
+// 代码围栏内的 # 行不视为标题；首个标题之前的内容并入第一章正文。
+func splitMarkdownChapters(content, level string) []mdChapterChunk {
+	prefix := "# "
+	if level == "h2" {
+		prefix = "## "
+	}
+	var chunks []mdChapterChunk
+	var pre strings.Builder
+	bodies := []strings.Builder{}
+	cur := -1
+	inCode := false
+	text := strings.ReplaceAll(content, "\r\n", "\n")
+	text = strings.ReplaceAll(text, "\r", "\n")
+	for _, line := range strings.Split(text, "\n") {
+		t := strings.TrimSpace(line)
+		if strings.HasPrefix(t, "```") {
+			inCode = !inCode
+		}
+		if !inCode && strings.HasPrefix(t, prefix) {
+			title := strings.TrimSpace(strings.TrimPrefix(t, prefix))
+			title = strings.TrimSpace(strings.TrimRight(title, "#"))
+			chunks = append(chunks, mdChapterChunk{Title: title})
+			bodies = append(bodies, strings.Builder{})
+			cur = len(chunks) - 1
+			continue
+		}
+		if cur < 0 {
+			pre.WriteString(line)
+			pre.WriteString("\n")
+		} else {
+			bodies[cur].WriteString(line)
+			bodies[cur].WriteString("\n")
+		}
+	}
+	if len(chunks) == 0 {
+		return nil
+	}
+	out := make([]mdChapterChunk, len(chunks))
+	for i := range chunks {
+		body := bodies[i].String()
+		if i == 0 && pre.Len() > 0 {
+			body = pre.String() + body
+		}
+		out[i] = mdChapterChunk{Title: chunks[i].Title, Body: strings.TrimSpace(body)}
+	}
+	return out
+}
+
+// truncateRunes 按 rune 截断
+func truncateRunes(s string, n int) string {
+	if utf8.RuneCountInString(s) <= n {
+		return s
+	}
+	return string([]rune(s)[:n])
+}
+
+// ImportFileInput 批量导入的单个文件
+type ImportFileInput struct {
+	Filename string `json:"filename"`
+	Content  string `json:"content"`
+}
+
+// chunksFromFile 把单个文件拆成章块：校验单文件大小，标题回退取文件名；
+// splitLevel 为 none 或未命中标题时整篇一章。
+func chunksFromFile(filename, content, splitLevel string) (string, []mdChapterChunk, error) {
+	if len(content) > MaxImportBytes {
+		return "", nil, errors.New("文件 " + sanitizeFilename(filename) + " 过大：单个文件不能超过 5MB")
+	}
+	base := sanitizeFilename(filename)
+	if i := strings.LastIndex(base, "."); i > 0 {
+		base = base[:i]
+	}
+	base = strings.TrimSpace(base)
+	if base == "" {
+		base = "未命名章节"
+	}
+	if utf8.RuneCountInString(base) > 200 {
+		base = truncateRunes(base, 200)
+	}
+
+	var chunks []mdChapterChunk
+	if splitLevel == "none" {
+		chunks = []mdChapterChunk{{Title: base, Body: strings.TrimSpace(content)}}
+	} else {
+		chunks = splitMarkdownChapters(content, splitLevel)
+	}
+	if len(chunks) == 0 {
+		chunks = []mdChapterChunk{{Title: base, Body: strings.TrimSpace(content)}}
+	}
+	return base, chunks, nil
+}
+
+// ImportMarkdownBatch 批量导入：多个 md 文件按传入顺序依次拆成顶级章（不生成节）。
+// splitLevel 对每个文件生效；无命中标题的文件回退为单章（标题取文件名）。
+// 任一文件失败整体回滚。单文件导入即长度为 1 的批量。
+func (s *LibraryService) ImportMarkdownBatch(docID uint, files []ImportFileInput, splitLevel string) ([]model.LibrarySection, error) {
+	var doc model.LibraryDoc
+	if err := s.db.First(&doc, docID).Error; err != nil {
+		return nil, ErrLibraryNotFound
+	}
+	if splitLevel != "h1" && splitLevel != "h2" && splitLevel != "none" {
+		return nil, errors.New("无效的拆分方式")
+	}
+	if len(files) == 0 {
+		return nil, errors.New("没有可导入的文件")
+	}
+	if len(files) > MaxImportFiles {
+		return nil, errors.New("单次最多导入 " + strconv.Itoa(MaxImportFiles) + " 个文件")
+	}
+	total := 0
+	for _, f := range files {
+		total += len(f.Content)
+	}
+	if total > MaxImportTotalBytes {
+		return nil, errors.New("导入内容总量过大：不能超过 20MB")
+	}
+
+	// 逐文件拆块（保留文件边界，便于错误提示定位到文件）
+	type mdFilePlan struct {
+		Base   string
+		Chunks []mdChapterChunk
+	}
+	plan := make([]mdFilePlan, 0, len(files))
+	totalChunks := 0
+	for _, f := range files {
+		base, chunks, err := chunksFromFile(f.Filename, f.Content, splitLevel)
+		if err != nil {
+			return nil, err
+		}
+		plan = append(plan, mdFilePlan{Base: base, Chunks: chunks})
+		totalChunks += len(chunks)
+	}
+
+	count, err := s.sectionCount(docID)
+	if err != nil {
+		return nil, err
+	}
+	if count+int64(totalChunks) > MaxSectionsPerDoc {
+		return nil, errors.New("导入后的章节数超过上限（现有 + 导入 ≤ 200）")
+	}
+	maxSort, err := s.sectionMaxSort(docID, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	created := make([]model.LibrarySection, 0, totalChunks)
+	err = s.db.Transaction(func(tx *gorm.DB) error {
+		offset := 0
+		for _, fp := range plan {
+			for i, ch := range fp.Chunks {
+				title := strings.TrimSpace(ch.Title)
+				if title == "" {
+					title = fp.Base + "（续）"
+				}
+				if utf8.RuneCountInString(title) > 200 {
+					title = truncateRunes(title, 200)
+				}
+				if utf8.RuneCountInString(ch.Body) > MaxSectionContent {
+					return errors.New("「" + fp.Base + "」第 " + strconv.Itoa(i+1) + " 章正文超过 100000 字，请先拆分后再导入")
+				}
+				sec := &model.LibrarySection{
+					DocID:     docID,
+					Title:     title,
+					Content:   ch.Body,
+					SortOrder: maxSort + 1 + offset + i,
+				}
+				if err := tx.Create(sec).Error; err != nil {
+					return err
+				}
+				created = append(created, *sec)
+			}
+			offset += len(fp.Chunks)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return created, nil
+}
+
+// ImportMarkdown 单文件导入（批量为长度 1 的特例，保留旧端点兼容）
+func (s *LibraryService) ImportMarkdown(docID uint, filename, content, splitLevel string) ([]model.LibrarySection, error) {
+	return s.ImportMarkdownBatch(docID, []ImportFileInput{{Filename: filename, Content: content}}, splitLevel)
+}

backend/service/library_test.go

@@ -0,0 +1,559 @@
+package service
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func newLibraryTestService(t *testing.T) (*LibraryService, string) {
+	t.Helper()
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.LibraryDoc{}, &model.LibraryFile{}, &model.LibrarySection{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	dir := t.TempDir()
+	s := NewLibraryService(db, dir)
+	if err := s.EnsureDir(); err != nil {
+		t.Fatalf("ensure dir: %v", err)
+	}
+	return s, dir
+}
+
+func libPub(b bool) *bool { return &b }
+
+func libInt(v int) *int { return &v }
+
+func TestLibraryNormalize(t *testing.T) {
+	cases := []struct {
+		name    string
+		mutate  func(*LibraryInput)
+		wantErr string
+	}{
+		{"slug 为空", func(i *LibraryInput) { i.Slug = "" }, "slug 不能为空"},
+		{"slug 非法", func(i *LibraryInput) { i.Slug = "Bad_Slug" }, "slug 仅允许"},
+		{"slug 超长", func(i *LibraryInput) { i.Slug = strings.Repeat("a", 65) }, "slug 不能超过"},
+		{"标题为空", func(i *LibraryInput) { i.Title = " " }, "标题不能为空"},
+		{"标题超限", func(i *LibraryInput) { i.Title = strings.Repeat("书", 201) }, "标题不能超过"},
+		{"介绍超限", func(i *LibraryInput) { i.Description = strings.Repeat("介", 20001) }, "介绍不能超过"},
+		{"作者超限", func(i *LibraryInput) { i.Author = strings.Repeat("作", 101) }, "作者不能超过"},
+		{"合法", func(i *LibraryInput) {}, ""},
+	}
+	for _, tc := range cases {
+		in := &LibraryInput{Slug: "how-to-live-better", Title: "怎样生活得更好"}
+		tc.mutate(in)
+		err := in.normalize()
+		if tc.wantErr == "" {
+			if err != nil {
+				t.Fatalf("%s: 不应报错，got %v", tc.name, err)
+			}
+			continue
+		}
+		if err == nil || !strings.Contains(err.Error(), tc.wantErr) {
+			t.Fatalf("%s: 期望包含 %q，got %v", tc.name, tc.wantErr, err)
+		}
+	}
+}
+
+func TestLibraryAuthorAndCreator(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	user := &model.User{Username: "curator", Nickname: "馆长", Avatar: "/a.png"}
+	if err := s.db.Create(user).Error; err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+
+	pub := true
+	doc, err := s.Create(&LibraryInput{
+		Slug: "authored", Title: "署名本", Author: "  鲁迅  ", Published: &pub,
+	}, user.ID)
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	if doc.Author != "鲁迅" || doc.CreatorID != user.ID {
+		t.Fatalf("作者应裁剪、创建者应落库，got %+v", doc)
+	}
+
+	list, err := s.ListPublished()
+	if err != nil {
+		t.Fatalf("list: %v", err)
+	}
+	if len(list) != 1 || list[0].Author != "鲁迅" {
+		t.Fatalf("列表作者异常: %+v", list)
+	}
+	if c := list[0].Creator; c == nil || c.ID != user.ID || c.Nickname != "馆长" {
+		t.Fatalf("列表创建者摘要异常: %+v", c)
+	}
+
+	detail, err := s.GetPublishedBySlug("authored")
+	if err != nil {
+		t.Fatalf("detail: %v", err)
+	}
+	if detail.Creator == nil || detail.Creator.Username != "curator" {
+		t.Fatalf("详情创建者摘要异常: %+v", detail.Creator)
+	}
+
+	// 作者可清空；更新不改变创建者归属
+	if _, err := s.Update(doc.ID, &LibraryInput{
+		Slug: "authored", Title: "署名本", Author: "", Published: &pub,
+	}); err != nil {
+		t.Fatalf("update: %v", err)
+	}
+	var again model.LibraryDoc
+	if err := s.db.First(&again, doc.ID).Error; err != nil {
+		t.Fatalf("reload: %v", err)
+	}
+	if again.Author != "" || again.CreatorID != user.ID {
+		t.Fatalf("更新后作者/创建者异常: %+v", again)
+	}
+}
+
+func TestLibrarySlugUnique(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	if _, err := s.Create(&LibraryInput{Slug: "epub-latest", Title: "A"}); err != nil {
+		t.Fatalf("create a: %v", err)
+	}
+	if _, err := s.Create(&LibraryInput{Slug: "epub-latest", Title: "B"}); err == nil {
+		t.Fatal("重复 slug 应报错")
+	}
+}
+
+func TestLibrarySlugReuseAfterSoftDelete(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, err := s.Create(&LibraryInput{Slug: "test", Title: "测试"})
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	if err := s.Delete(doc.ID); err != nil {
+		t.Fatalf("delete: %v", err)
+	}
+
+	// 软删后重建同 slug：报"已删除"提示而非数据库唯一索引错误
+	_, err = s.Create(&LibraryInput{Slug: "test", Title: "重建"})
+	if err == nil || !strings.Contains(err.Error(), "已删除") {
+		t.Fatalf("软删后重建应提示已删除条目占用，got %v", err)
+	}
+
+	// 彻底删除后可重建
+	if err := s.Purge(doc.ID); err != nil {
+		t.Fatalf("purge: %v", err)
+	}
+	if _, err := s.Create(&LibraryInput{Slug: "test", Title: "重建"}); err != nil {
+		t.Fatalf("purge 后重建同 slug 不应报错: %v", err)
+	}
+}
+
+func TestLibraryPurgeRequiresDeleted(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "alive", Title: "在用"})
+	if err := s.Purge(doc.ID); err == nil || !errors.Is(err, ErrLibraryNotDeleted) {
+		t.Fatalf("未删条目 Purge 应拒绝，got %v", err)
+	}
+}
+
+func TestLibraryPurgeRemovesFilesAndSections(t *testing.T) {
+	s, dir := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "purge-me", Title: "待清"})
+	f, err := s.AddFile(doc.ID, 1, "x.txt", strings.NewReader("x"))
+	if err != nil {
+		t.Fatalf("add file: %v", err)
+	}
+	full := filepath.Join(dir, "library", f.StoredName)
+	if _, err := os.Stat(full); err != nil {
+		t.Fatalf("文件未落盘: %v", err)
+	}
+	if _, err := s.CreateSection(doc.ID, &SectionInput{Title: "第一章"}); err != nil {
+		t.Fatalf("create section: %v", err)
+	}
+
+	if err := s.Delete(doc.ID); err != nil {
+		t.Fatalf("delete: %v", err)
+	}
+	if err := s.Purge(doc.ID); err != nil {
+		t.Fatalf("purge: %v", err)
+	}
+
+	var n int64
+	s.db.Unscoped().Model(&model.LibraryDoc{}).Count(&n)
+	if n != 0 {
+		t.Fatalf("条目行应已清除，got %d", n)
+	}
+	s.db.Unscoped().Model(&model.LibraryFile{}).Count(&n)
+	if n != 0 {
+		t.Fatalf("文件行应已清除，got %d", n)
+	}
+	s.db.Unscoped().Model(&model.LibrarySection{}).Count(&n)
+	if n != 0 {
+		t.Fatalf("章节行应已清除，got %d", n)
+	}
+	if _, err := os.Stat(full); !os.IsNotExist(err) {
+		t.Fatalf("磁盘文件应已删除，err=%v", err)
+	}
+}
+
+func TestLibraryExtWhitelists(t *testing.T) {
+	if !LibraryExtAllowed("epub") || !LibraryExtAllowed(".md") {
+		t.Fatal("白名单内扩展名应允许")
+	}
+	if LibraryExtAllowed("exe") || LibraryExtAllowed("php") || LibraryExtAllowed("") {
+		t.Fatal("白名单外扩展名应拒绝")
+	}
+}
+
+func TestLibraryAddFile(t *testing.T) {
+	s, dir := newLibraryTestService(t)
+	doc, err := s.Create(&LibraryInput{Slug: "how-to-live-better", Title: "怎样生活得更好"})
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+
+	// 白名单内：落盘 + 建行
+	f, err := s.AddFile(doc.ID, 1, "如何生活.pdf", strings.NewReader("PDF-DATA"))
+	if err != nil {
+		t.Fatalf("add pdf: %v", err)
+	}
+	if f.Ext != "pdf" || f.Size != 8 {
+		t.Fatalf("文件元数据错误: %+v", f)
+	}
+	if f.MIME != "application/pdf" {
+		t.Fatalf("pdf MIME 应为 application/pdf，got %s", f.MIME)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "library", f.StoredName)); err != nil {
+		t.Fatalf("文件未落盘: %v", err)
+	}
+
+	// html 存储层 MIME 强制 octet-stream（下载安全）
+	h, err := s.AddFile(doc.ID, 1, "page.html", strings.NewReader("<h1>hi</h1>"))
+	if err != nil {
+		t.Fatalf("add html: %v", err)
+	}
+	if h.MIME != "application/octet-stream" {
+		t.Fatalf("html 下载 MIME 应强制 octet-stream，got %s", h.MIME)
+	}
+
+	// 白名单外拒绝
+	if _, err := s.AddFile(doc.ID, 1, "evil.exe", strings.NewReader("MZ")); err == nil {
+		t.Fatal("exe 应被拒绝")
+	}
+	if _, err := s.AddFile(doc.ID, 1, "noext", strings.NewReader("x")); err == nil {
+		t.Fatal("无扩展名应被拒绝")
+	}
+
+	// 超过每条目上限
+	for i := 0; i < MaxLibraryFilesPerDoc-2; i++ {
+		if _, err := s.AddFile(doc.ID, 1, "f.txt", strings.NewReader("x")); err != nil {
+			t.Fatalf("add #%d: %v", i, err)
+		}
+	}
+	if _, err := s.AddFile(doc.ID, 1, "over.txt", strings.NewReader("x")); err == nil {
+		t.Fatal("超出文件数上限应报错")
+	}
+
+	// 未发布条目的文件公开不可见
+	if _, err := s.GetPublicFile(f.ID); err == nil {
+		t.Fatal("未发布条目的文件不应公开可见")
+	}
+}
+
+func TestLibraryPublishedFilterAndOrder(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	if _, err := s.Create(&LibraryInput{Slug: "draft-doc", Title: "草稿"}); err != nil {
+		t.Fatalf("create draft: %v", err)
+	}
+	published, _ := s.Create(&LibraryInput{
+		Slug: "live-doc", Title: "已发布", Published: libPub(true), SortOrder: libInt(1),
+	})
+
+	if _, err := s.AddFile(published.ID, 1, "b.txt", strings.NewReader("b")); err != nil {
+		t.Fatalf("add b: %v", err)
+	}
+	if _, err := s.AddFile(published.ID, 1, "a.txt", strings.NewReader("a")); err != nil {
+		t.Fatalf("add a: %v", err)
+	}
+
+	// 未发布不出现在公开目录
+	list, err := s.ListPublished()
+	if err != nil {
+		t.Fatalf("ListPublished: %v", err)
+	}
+	if len(list) != 1 || list[0].Slug != "live-doc" {
+		t.Fatalf("公开目录应只含 live-doc，got %+v", list)
+	}
+	if list[0].FileCount != 2 {
+		t.Fatalf("列表应带文件计数 2，got %d", list[0].FileCount)
+	}
+	if _, err := s.GetPublishedBySlug("draft-doc"); err == nil {
+		t.Fatal("未发布条目按 slug 不应可见")
+	}
+
+	// 软删后公开彻底不可见
+	if err := s.Delete(published.ID); err != nil {
+		t.Fatalf("delete: %v", err)
+	}
+	if _, err := s.GetPublishedBySlug("live-doc"); err == nil {
+		t.Fatal("软删条目不应可见")
+	}
+
+	// 管理端仍可见（含未发布；软删条目带 Deleted 标记一并列出）
+	all, err := s.ListAll()
+	if err != nil {
+		t.Fatalf("ListAll: %v", err)
+	}
+	if len(all) != 2 {
+		t.Fatalf("管理端应含 draft-doc 与软删的 live-doc，got %+v", all)
+	}
+	bySlug := map[string]LibraryDocDetail{}
+	for _, d := range all {
+		bySlug[d.Slug] = d
+	}
+	if d := bySlug["draft-doc"]; d.Deleted {
+		t.Fatalf("draft-doc 不应标记已删除: %+v", d)
+	}
+	if d := bySlug["live-doc"]; !d.Deleted {
+		t.Fatalf("live-doc 应标记已删除: %+v", d)
+	}
+}
+
+func TestLibraryFileOrdering(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "order", Title: "排序", Published: libPub(true)})
+	// b 先传（id 小），a 设 sort_order 靠前
+	b, _ := s.AddFile(doc.ID, 1, "b.txt", strings.NewReader("b"))
+	a, _ := s.AddFile(doc.ID, 1, "a.txt", strings.NewReader("a"))
+	s.db.Model(&model.LibraryFile{}).Where("id = ?", a.ID).Update("sort_order", -1)
+	_ = b
+
+	d, err := s.GetPublishedBySlug("order")
+	if err != nil {
+		t.Fatalf("detail: %v", err)
+	}
+	if len(d.Files) != 2 || d.Files[0].Name != "a.txt" {
+		t.Fatalf("文件应按 sort_order,id 排序: %+v", d.Files)
+	}
+}
+
+func TestLibraryIncrDownload(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "cnt", Title: "计数", Published: libPub(true)})
+	f, err := s.AddFile(doc.ID, 1, "x.pdf", strings.NewReader("x"))
+	if err != nil {
+		t.Fatalf("add: %v", err)
+	}
+	s.IncrDownload(f.ID)
+	s.IncrDownload(f.ID)
+	got, err := s.GetPublicFile(f.ID)
+	if err != nil {
+		t.Fatalf("get: %v", err)
+	}
+	if got.DownloadCount != 2 {
+		t.Fatalf("下载计数应为 2，got %d", got.DownloadCount)
+	}
+}
+
+func TestLibraryDeleteFile(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "del", Title: "删除"})
+	f, err := s.AddFile(doc.ID, 1, "gone.txt", strings.NewReader("gone"))
+	if err != nil {
+		t.Fatalf("add: %v", err)
+	}
+	if err := s.DeleteFile(f.ID); err != nil {
+		t.Fatalf("delete file: %v", err)
+	}
+	if err := s.DeleteFile(f.ID); err == nil {
+		t.Fatal("重复删除应报不存在")
+	}
+}
+
+// ---------- 章节（两级树） ----------
+
+func TestLibrarySectionTwoLevelConstraint(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "book", Title: "书"})
+
+	ch, err := s.CreateSection(doc.ID, &SectionInput{Title: "第一章"})
+	if err != nil {
+		t.Fatalf("create chapter: %v", err)
+	}
+	sec, err := s.CreateSection(doc.ID, &SectionInput{ParentID: &ch.ID, Title: "第一节"})
+	if err != nil {
+		t.Fatalf("create section: %v", err)
+	}
+	if sec.ParentID == nil || *sec.ParentID != ch.ID {
+		t.Fatalf("节的父应为章 %d", ch.ID)
+	}
+	// 节下不能再挂节
+	if _, err := s.CreateSection(doc.ID, &SectionInput{ParentID: &sec.ID, Title: "深层"}); err == nil {
+		t.Fatal("三级嵌套应被拒绝")
+	}
+	// 跨条目父章节
+	doc2, _ := s.Create(&LibraryInput{Slug: "book2", Title: "书2"})
+	if _, err := s.CreateSection(doc2.ID, &SectionInput{ParentID: &ch.ID, Title: "跨条目"}); err == nil {
+		t.Fatal("跨条目父章节应被拒绝")
+	}
+}
+
+func TestLibrarySectionMoveSwap(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "mv", Title: "排序"})
+	a, _ := s.CreateSection(doc.ID, &SectionInput{Title: "甲"})
+	b, _ := s.CreateSection(doc.ID, &SectionInput{Title: "乙"})
+	c, _ := s.CreateSection(doc.ID, &SectionInput{Title: "丙"})
+
+	if err := s.MoveSection(b.ID, "up"); err != nil {
+		t.Fatalf("move up: %v", err)
+	}
+	secs, _ := s.ListSections(doc.ID)
+	if secs[0].ID != b.ID || secs[1].ID != a.ID || secs[2].ID != c.ID {
+		t.Fatalf("上移后顺序应为 乙甲丙: %+v", titles(secs))
+	}
+	// 边界 no-op
+	if err := s.MoveSection(b.ID, "up"); err != nil {
+		t.Fatalf("边界上移: %v", err)
+	}
+	if err := s.MoveSection(b.ID, "bad"); err == nil {
+		t.Fatal("非法方向应报错")
+	}
+}
+
+func titles(secs []model.LibrarySection) []string {
+	out := make([]string, len(secs))
+	for i, sec := range secs {
+		out[i] = sec.Title
+	}
+	return out
+}
+
+func TestLibraryImportMarkdown(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "imp", Title: "导入"})
+
+	// h2 拆分：围栏内 ## 不拆；首标题前内容并入第一章
+	md := "## 前言\n\n引言正文。\n\n```\n## 不是标题\n```\n\n## 第二章\n\n内容二。"
+	secs, err := s.ImportMarkdown(doc.ID, "how.md", md, "h2")
+	if err != nil {
+		t.Fatalf("import: %v", err)
+	}
+	if len(secs) != 2 {
+		t.Fatalf("应拆出 2 章，got %d: %+v", len(secs), titles(secs))
+	}
+	if secs[0].Title != "前言" || !strings.Contains(secs[0].Content, "引言正文") {
+		t.Fatalf("第一章错误: %+v", secs[0])
+	}
+	if !strings.Contains(secs[0].Content, "不是标题") {
+		t.Fatal("围栏内的 ## 行应留在第一章正文，不应被拆分")
+	}
+	if secs[1].Title != "第二章" {
+		t.Fatalf("第二章标题错误: %+v", secs[1])
+	}
+
+	// 无命中标题 → 回退单章，标题取文件名
+	secs2, err := s.ImportMarkdown(doc.ID, "README.md", "只有正文，没有标题。", "h1")
+	if err != nil {
+		t.Fatalf("import fallback: %v", err)
+	}
+	if len(secs2) != 1 || secs2[0].Title != "README" {
+		t.Fatalf("应回退单章 README: %+v", titles(secs2))
+	}
+
+	// 非法 splitLevel
+	if _, err := s.ImportMarkdown(doc.ID, "x.md", "x", "h3"); err == nil {
+		t.Fatal("非法拆分方式应报错")
+	}
+}
+
+func TestLibraryImportMarkdownBatch(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "impb", Title: "批量导入"})
+
+	files := []ImportFileInput{
+		{Filename: "01-不想早死.md", Content: "## 甲\n\n内容甲。"},
+		{Filename: "02-不要慢性自杀.md", Content: "只有正文，没有标题。"},
+		{Filename: "03.md", Content: "# 丙\n\n内容丙。"},
+	}
+	secs, err := s.ImportMarkdownBatch(doc.ID, files, "h2")
+	if err != nil {
+		t.Fatalf("batch import: %v", err)
+	}
+	// 文件1 按 h2 拆出 1 章；文件2、文件3 未命中 ## → 回退单章（标题取文件名）
+	if len(secs) != 3 {
+		t.Fatalf("应创建 3 章，got %d: %+v", len(secs), titles(secs))
+	}
+	if secs[0].Title != "甲" {
+		t.Fatalf("文件1 应按 h2 拆出章: %+v", titles(secs))
+	}
+	if secs[1].Title != "02-不要慢性自杀" {
+		t.Fatalf("文件2 标题应取文件名: %+v", titles(secs))
+	}
+	if secs[2].Title != "03" {
+		t.Fatalf("文件3 未命中 ## 应回退单章: %+v", titles(secs))
+	}
+	for i, sec := range secs {
+		if sec.SortOrder != i {
+			t.Fatalf("sort_order 应按文件顺序连续: %+v", titles(secs))
+		}
+	}
+
+	// 文件数超限
+	many := make([]ImportFileInput, MaxImportFiles+1)
+	for i := range many {
+		many[i] = ImportFileInput{Filename: "f.md", Content: "x"}
+	}
+	if _, err := s.ImportMarkdownBatch(doc.ID, many, "none"); err == nil {
+		t.Fatal("文件数超过上限应报错")
+	}
+
+	// 空文件列表
+	if _, err := s.ImportMarkdownBatch(doc.ID, nil, "none"); err == nil {
+		t.Fatal("空文件列表应报错")
+	}
+}
+
+func TestLibraryDeleteSectionCascade(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "cas", Title: "级联"})
+	ch, _ := s.CreateSection(doc.ID, &SectionInput{Title: "章"})
+	sec, _ := s.CreateSection(doc.ID, &SectionInput{ParentID: &ch.ID, Title: "节"})
+
+	if err := s.DeleteSection(ch.ID); err != nil {
+		t.Fatalf("delete chapter: %v", err)
+	}
+	// 章与节都被软删
+	if _, err := s.section(ch.ID); err == nil {
+		t.Fatal("章应已删除")
+	}
+	if _, err := s.section(sec.ID); err == nil {
+		t.Fatal("章删除时其下小节应级联删除")
+	}
+}
+
+func TestLibraryDetailCarriesSections(t *testing.T) {
+	s, _ := newLibraryTestService(t)
+	doc, _ := s.Create(&LibraryInput{Slug: "carry", Title: "携带", Published: libPub(true)})
+	if _, err := s.CreateSection(doc.ID, &SectionInput{Title: "章一", Content: "正文一"}); err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	d, err := s.GetPublishedBySlug("carry")
+	if err != nil {
+		t.Fatalf("detail: %v", err)
+	}
+	if len(d.Sections) != 1 || d.Sections[0].Content != "正文一" {
+		t.Fatalf("公开详情应携带章节: %+v", d.Sections)
+	}
+	// 草稿条目不可见
+	doc2, _ := s.Create(&LibraryInput{Slug: "draft", Title: "草稿书"})
+	if _, err := s.CreateSection(doc2.ID, &SectionInput{Title: "草稿章"}); err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	if _, err := s.GetPublishedBySlug("draft"); err == nil {
+		t.Fatal("草稿条目不应出现在公开详情")
+	}
+}

backend/service/login_session_test.go

@@ -188,10 +188,10 @@ func TestRevokeLoginDeviceWithMultiSessions(t *testing.T) {
 	}
 }
 
-// TestRefreshReuseRevokesFamilyOnly 宽限期外的重放判定盗用时，仅吊销该轮转链
-// 所在家族，不牵连同用户其他登录设备（此前误撤全用户会话：开发期 middleware
-// /浏览器丢轮换的竞态会把 Chrome 等所有设备一齐踢下线）。
-func TestRefreshReuseRevokesFamilyOnly(t *testing.T) {
+// TestRefreshReplayBeyondGraceSelfHeals 宽限期外的同链重放：最常见成因是
+// 轮换响应丢失（RSC 预取被中止、移动端切后台挂起等），而非盗用。重放应补发
+// 轮转链头节点 token 对自愈，家族保持活跃，也不牵连同用户其他登录设备。
+func TestRefreshReplayBeyondGraceSelfHeals(t *testing.T) {
 	db := newLoginSessionTestDB(t)
 	s := NewAuthService(db, "test-secret")
 	user := newLoginSessionUser(t, db, "dave")
@@ -204,7 +204,7 @@ func TestRefreshReuseRevokesFamilyOnly(t *testing.T) {
 	if err != nil {
 		t.Fatalf("parse access 1: %v", err)
 	}
-	access2, refresh2, _, _, err := s.Login("dave", "password123", "2.2.2.2", "iPhone-Mobile")
+	access2, _, _, _, err := s.Login("dave", "password123", "2.2.2.2", "iPhone-Mobile")
 	if err != nil {
 		t.Fatalf("login 2: %v", err)
 	}
@@ -213,8 +213,9 @@ func TestRefreshReuseRevokesFamilyOnly(t *testing.T) {
 		t.Fatalf("parse access 2: %v", err)
 	}
 
-	// 家族1 正常轮转一次：旧行吊销并链接到新行
-	if _, _, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home"); err != nil {
+	// 家族1 正常轮转一次：旧行吊销并链接到新行，得到头节点 refresh2
+	_, refresh2, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home")
+	if err != nil {
 		t.Fatalf("rotate 1: %v", err)
 	}
 
@@ -225,21 +226,102 @@ func TestRefreshReuseRevokesFamilyOnly(t *testing.T) {
 		t.Fatalf("backdate rotated_at: %v", err)
 	}
 
-	// 宽限期外重放：判定盗用，仅家族1 被整体吊销
-	if _, _, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home"); !errors.Is(err, ErrRefreshReused) {
-		t.Fatalf("期望 ErrRefreshReused，实际 %v", err)
+	// 宽限期外重放：自愈放行，返回头节点（当前代）token 对
+	at, replayRefresh, replayUser, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("宽限期外重放应自愈放行，实际 %v", err)
 	}
-	if s.familySessionActive(user.ID, claims1.FamilyID) {
-		t.Fatal("重放所在家族应被整体吊销")
+	if replayRefresh != refresh2 {
+		t.Fatal("自愈应返回轮转链头节点的 refresh token")
+	}
+	if replayUser == nil || replayUser.ID != user.ID {
+		t.Fatal("自愈应返回所属用户")
+	}
+	if _, err := s.ValidateRefreshToken(refresh2); err != nil {
+		t.Fatalf("头节点 refresh 应保持有效: %v", err)
+	}
+	if !s.familySessionActive(user.ID, claims1.FamilyID) {
+		t.Fatal("重放所在家族应保持活跃，不被吊销")
 	}
 	if !s.familySessionActive(user.ID, claims2.FamilyID) {
 		t.Fatal("其他登录设备（家族）不应被牵连")
 	}
-	if n := countActiveSessions(t, db, user.ID); n != 1 {
-		t.Fatalf("应仅剩家族2 的 1 个活跃会话，实际 %d", n)
+	if n := countActiveSessions(t, db, user.ID); n != 2 {
+		t.Fatalf("两个家族应共 2 个活跃会话，实际 %d", n)
 	}
-	if _, err := s.ValidateRefreshToken(refresh2); err != nil {
-		t.Fatalf("其他设备的 refresh 不应受影响: %v", err)
+	if claims, err := s.ParseToken(at); err != nil {
+		t.Fatalf("自愈签发的 access token 应可解析: %v", err)
+	} else if _, err := s.ValidateClaims(claims); err != nil {
+		t.Fatalf("自愈签发的 access token 应有效: %v", err)
+	}
+}
+
+// TestRefreshReplayMultiHopHealsToHead 轮转链已前进多代后重放最早一代：
+// 应沿 rotated_to 链走到头节点，补发最新一代 token 对。
+func TestRefreshReplayMultiHopHealsToHead(t *testing.T) {
+	db := newLoginSessionTestDB(t)
+	s := NewAuthService(db, "test-secret")
+	newLoginSessionUser(t, db, "frank")
+
+	_, refresh1, _, _, err := s.Login("frank", "password123", "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("login: %v", err)
+	}
+	_, refresh2, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("rotate 1: %v", err)
+	}
+	_, refresh3, _, err := s.RotateRefreshToken(refresh2, "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("rotate 2: %v", err)
+	}
+
+	// 各代 rotated_at 均拨回宽限期之外，模拟浏览器长时间后才补投旧 token
+	if err := db.Model(&model.RefreshToken{}).
+		Where("token_hash IN ?", []string{hashRefreshToken(refresh1), hashRefreshToken(refresh2)}).
+		Update("rotated_at", time.Now().Add(-2*time.Minute)).Error; err != nil {
+		t.Fatalf("backdate rotated_at: %v", err)
+	}
+
+	_, replayRefresh, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("多级链重放应自愈到头节点，实际 %v", err)
+	}
+	if replayRefresh != refresh3 {
+		t.Fatal("自愈应返回最新一代（头节点）的 refresh token")
+	}
+}
+
+// TestRefreshReplayDeadChainRejected 轮转链已无有效头节点（家族被整体吊销：
+// 设备剔除/超限淘汰/改密/封禁）时，宽限期外重放属真实失效，应拒绝并返回
+// ErrRefreshInvalid，且不得复活任何会话。
+func TestRefreshReplayDeadChainRejected(t *testing.T) {
+	db := newLoginSessionTestDB(t)
+	s := NewAuthService(db, "test-secret")
+	user := newLoginSessionUser(t, db, "grace")
+
+	_, refresh1, _, _, err := s.Login("grace", "password123", "1.1.1.1", "Chrome-Home")
+	if err != nil {
+		t.Fatalf("login: %v", err)
+	}
+	if _, _, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home"); err != nil {
+		t.Fatalf("rotate: %v", err)
+	}
+	// 模拟改密/封禁/剔除设备类处置：家族整体吊销
+	if err := s.RevokeAllUserRefreshTokens(user.ID); err != nil {
+		t.Fatalf("revoke all: %v", err)
+	}
+	if err := db.Model(&model.RefreshToken{}).
+		Where("token_hash = ?", hashRefreshToken(refresh1)).
+		Update("rotated_at", time.Now().Add(-2*time.Minute)).Error; err != nil {
+		t.Fatalf("backdate rotated_at: %v", err)
+	}
+
+	if _, _, _, err := s.RotateRefreshToken(refresh1, "1.1.1.1", "Chrome-Home"); !errors.Is(err, ErrRefreshInvalid) {
+		t.Fatalf("死链重放应返回 ErrRefreshInvalid，实际 %v", err)
+	}
+	if n := countActiveSessions(t, db, user.ID); n != 0 {
+		t.Fatalf("死链自愈不得复活会话，活跃会话应仍为 0，实际 %d", n)
 	}
 }
 

backend/service/media_library.go

@@ -30,6 +30,27 @@ var mediaLibraryCategories = []struct {
 	{"brand", "brand", "品牌资源"},
 }
 
+// 衍生分类：不对应 uploads 子目录，按附件 source 归类
+const (
+	mediaCategoryBook     = "book"
+	mediaCategoryBookName = "书籍"
+)
+
+// mediaCategoryForAttachment 附件在媒体库中的展示分类：
+// 书库封面 / 正文插图（source=library_cover|library_content）统一归“书籍”，
+// 其余按 kind 对应磁盘目录分类。
+func mediaCategoryForAttachment(kind, source string) (key, name string) {
+	if source == model.AttachmentSourceLibraryCover || source == model.AttachmentSourceLibraryContent {
+		return mediaCategoryBook, mediaCategoryBookName
+	}
+	for _, cat := range mediaLibraryCategories {
+		if cat.Key == kind {
+			return cat.Key, cat.Name
+		}
+	}
+	return kind, kind
+}
+
 // MediaLibraryItem 媒体库条目
 type MediaLibraryItem struct {
 	URL          string     `json:"url"`                    // 展示地址（有 WebP 时为 WebP）
@@ -53,6 +74,7 @@ func (s *UploadService) AdminMediaLibrary() ([]MediaLibraryItem, map[string]int,
 	// 附件元数据索引：URL → 记录（联出上传者昵称）
 	type attMeta struct {
 		Kind      string
+		Source    string
 		URL       string
 		MIME      string
 		Size      int
@@ -64,7 +86,7 @@ func (s *UploadService) AdminMediaLibrary() ([]MediaLibraryItem, map[string]int,
 	}
 	var rows []attMeta
 	if err := s.db.Table("attachments").
-		Select("attachments.kind, attachments.url, attachments.mime, attachments.size, attachments.width, attachments.height, attachments.created_at, users.nickname, users.username").
+		Select("attachments.kind, attachments.source, attachments.url, attachments.mime, attachments.size, attachments.width, attachments.height, attachments.created_at, users.nickname, users.username").
 		Joins("LEFT JOIN users ON users.id = attachments.user_id").
 		Scan(&rows).Error; err != nil {
 		return nil, nil, err
@@ -72,30 +94,22 @@ func (s *UploadService) AdminMediaLibrary() ([]MediaLibraryItem, map[string]int,
 	metaByURL := make(map[string]attMeta, len(rows))
 	// 远程存储对象（/api/media/）不在磁盘上，直接作为条目加入
 	items := make([]MediaLibraryItem, 0, len(rows))
-	categoryName := func(key string) string {
-		for _, cat := range mediaLibraryCategories {
-			if cat.Key == key {
-				return cat.Name
-			}
-		}
-		return key
-	}
 	for _, r := range rows {
 		metaByURL[r.URL] = r // 本地文件在磁盘扫描时按 URL 合并元数据
 		if !strings.HasPrefix(r.URL, "/api/media/") {
 			continue
 		}
+		if r.Kind != model.AttachmentKindImage && r.Kind != model.AttachmentKindAvatar {
+			continue // 未知 kind 不进媒体库
+		}
 		uploader := r.Nickname
 		if uploader == "" {
 			uploader = r.Username
 		}
-		cat := r.Kind
-		if cat != model.AttachmentKindImage && cat != model.AttachmentKindAvatar {
-			continue // 未知 kind 不进媒体库
-		}
+		catKey, catName := mediaCategoryForAttachment(r.Kind, r.Source)
 		ca := r.CreatedAt
 		items = append(items, MediaLibraryItem{
-			URL: r.URL, Category: cat, CategoryName: categoryName(cat),
+			URL: r.URL, Category: catKey, CategoryName: catName,
 			Name: strings.TrimPrefix(r.URL, "/api/media/"), MIME: r.MIME,
 			Size: int64(r.Size), Width: r.Width, Height: r.Height,
 			Uploader: uploader, UploadedAt: &ca,
@@ -153,6 +167,11 @@ func (s *UploadService) AdminMediaLibrary() ([]MediaLibraryItem, map[string]int,
 				if m.Width > 0 {
 					item.Width, item.Height = m.Width, m.Height
 				}
+				// 书库封面 / 正文插图改归“书籍”分类
+				if m.Source == model.AttachmentSourceLibraryCover || m.Source == model.AttachmentSourceLibraryContent {
+					item.Category = mediaCategoryBook
+					item.CategoryName = mediaCategoryBookName
+				}
 			}
 			// 无尺寸记录时读图片头解析宽高（失败不阻断，保持 0）
 			if item.Width == 0 && item.Size > 0 && item.Size <= 20<<20 {
@@ -243,6 +262,8 @@ func (s *UploadService) attachMediaSources(items []MediaLibraryItem) {
 	postByURL := map[string]postRef{}
 	type commentRef struct {
 		id, postID uint
+		floor      uint
+		isRoot     bool
 	}
 	commentByURL := map[string]commentRef{}
 
@@ -299,6 +320,19 @@ func (s *UploadService) attachMediaSources(items []MediaLibraryItem) {
 		}
 	}
 
+	// 评论锚点改用所属帖内相对楼层号（#comment-{floor}，楼中楼追加 -r{id}）
+	commentIDs := make([]uint, 0, len(commentByURL))
+	for _, cm := range commentByURL {
+		commentIDs = append(commentIDs, cm.id)
+	}
+	commentAnchors := CommentAnchors(s.db, commentIDs)
+	for u, cm := range commentByURL {
+		if a, ok := commentAnchors[cm.id]; ok {
+			cm.floor, cm.isRoot = a.Floor, a.IsRoot
+			commentByURL[u] = cm
+		}
+	}
+
 	// 评论来源要带宿主帖子标题，一次性补齐
 	postTitle := func(id uint) string {
 		var p model.Post
@@ -374,7 +408,15 @@ func (s *UploadService) attachMediaSources(items []MediaLibraryItem) {
 				break
 			}
 			if cm, ok := commentByURL[u]; ok {
-				it.SourceURL = fmt.Sprintf("/post/%d#comment-%d", cm.postID, cm.id)
+				if cm.floor > 0 {
+					if cm.isRoot {
+						it.SourceURL = fmt.Sprintf("/post/%d#comment-%d", cm.postID, cm.floor)
+					} else {
+						it.SourceURL = fmt.Sprintf("/post/%d#comment-%d-r%d", cm.postID, cm.floor, cm.id)
+					}
+				} else {
+					it.SourceURL = fmt.Sprintf("/post/%d", cm.postID)
+				}
 				title := commentPostTitle[cm.postID]
 				if title != "" {
 					it.SourceLabel = "帖子《" + truncate(title, 40) + "》下的评论"

backend/service/media_library_test.go

@@ -250,8 +250,7 @@ func TestAdminMediaLibraryAttachSources(t *testing.T) {
 	if !ok {
 		t.Fatal("comment image missing")
 	}
-	if cimg.SourceURL != fmt.Sprintf("/post/%d#comment-", post.ID) &&
-		!strings.HasPrefix(cimg.SourceURL, fmt.Sprintf("/post/%d#comment-", post.ID)) {
+	if cimg.SourceURL != fmt.Sprintf("/post/%d#comment-1", post.ID) {
 		t.Fatalf("comment source url wrong: %+v", cimg)
 	}
 	if !strings.Contains(cimg.SourceLabel, "下的评论") {
@@ -259,6 +258,63 @@ func TestAdminMediaLibraryAttachSources(t *testing.T) {
 	}
 }
 
+func TestAdminMediaLibraryBookCategory(t *testing.T) {
+	s, dir := newMediaLibraryService(t)
+
+	// 书籍封面（本地磁盘）与正文插图（远程对象），另有一张普通帖子插图
+	writeMediaFile(t, dir, "images/cover.webp", []byte("fake-webp-bytes"))
+
+	if err := s.db.Create(&model.User{Username: "alice", Nickname: "爱丽丝"}).Error; err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+	var alice model.User
+	if err := s.db.Where("username = ?", "alice").First(&alice).Error; err != nil {
+		t.Fatalf("load user: %v", err)
+	}
+	created := time.Date(2026, 9, 1, 10, 0, 0, 0, time.UTC)
+	mkAtt := func(source, url string) {
+		if err := s.db.Create(&model.Attachment{
+			UserID: alice.ID, Kind: model.AttachmentKindImage, Source: source,
+			URL: url, MIME: "image/webp", Size: 100, Width: 10, Height: 10,
+			CreatedAt: created,
+		}).Error; err != nil {
+			t.Fatalf("create attachment %s: %v", source, err)
+		}
+	}
+	mkAtt(model.AttachmentSourceLibraryCover, "/uploads/images/cover.webp")
+	mkAtt(model.AttachmentSourceLibraryContent, "/api/media/book-content")
+	mkAtt(model.AttachmentSourcePost, "/api/media/post-image")
+
+	items, counts, err := s.AdminMediaLibrary()
+	if err != nil {
+		t.Fatalf("AdminMediaLibrary: %v", err)
+	}
+	byURL := map[string]MediaLibraryItem{}
+	for _, it := range items {
+		byURL[it.URL] = it
+	}
+
+	// 封面（磁盘）与正文插图（远程）都归“书籍”
+	for _, u := range []string{"/uploads/images/cover.webp", "/api/media/book-content"} {
+		it, ok := byURL[u]
+		if !ok {
+			t.Fatalf("%s missing", u)
+		}
+		if it.Category != "book" || it.CategoryName != "书籍" {
+			t.Fatalf("%s should be book category, got %q/%q", u, it.Category, it.CategoryName)
+		}
+	}
+
+	// 普通帖子插图仍归 image
+	if post := byURL["/api/media/post-image"]; post.Category != "image" {
+		t.Fatalf("post image should stay image category, got %q", post.Category)
+	}
+
+	if counts["book"] != 2 || counts["image"] != 1 {
+		t.Fatalf("counts wrong: %v", counts)
+	}
+}
+
 func TestMediaThumb(t *testing.T) {
 	s, dir := newMediaLibraryService(t)
 

backend/service/media_thumbs.go

@@ -1,27 +1,19 @@
 package service
 
 import (
-	"bytes"
 	"crypto/sha1"
 	"encoding/hex"
 	"errors"
-	"image"
-	_ "image/gif"
-	_ "image/jpeg"
-	_ "image/png"
 	"os"
 	"path/filepath"
 	"strings"
-
-	webpenc "github.com/gen2brain/webp"
-	"golang.org/x/image/draw"
-	xwebp "golang.org/x/image/webp"
 )
 
 // 媒体库缩略图：管理后台网格不再直连原图（全量图片一次加载网络压力大）。
 // 服务端按需生成最长边 480px 的 WebP 缩略图，落盘 .thumbs/（按 URL 哈希命名）缓存，
 // 源文件更新后（mtime 更新）自动重建。仅覆盖本地 /uploads/ 图片；
 // 远程存储对象与解码失败（如动图 WebP）由调用方回退原图。
+// 解码/缩放/编码/原子落盘共用 image_variants.go 的图片处理核心。
 
 // MediaThumbMaxSide 缩略图最长边（网格单元 ~200px，2x DPR 足够）
 const MediaThumbMaxSide = 480
@@ -70,12 +62,7 @@ func (s *UploadService) MediaThumb(url string) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	var img image.Image
-	if ext == ".webp" {
-		img, err = xwebp.Decode(bytes.NewReader(data))
-	} else {
-		img, _, err = image.Decode(bytes.NewReader(data))
-	}
+	img, err := decodeImageBytes(data, ext == ".webp")
 	if err != nil {
 		return nil, err // 如动图 WebP，调用方回退原图
 	}
@@ -94,21 +81,13 @@ func (s *UploadService) MediaThumb(url string) ([]byte, error) {
 		nh = MediaThumbMaxSide
 		nw = max(1, w*MediaThumbMaxSide/h)
 	}
-	dst := image.NewRGBA(image.Rect(0, 0, nw, nh))
-	draw.CatmullRom.Scale(dst, dst.Bounds(), img, b, draw.Src, nil)
+	dst := scaleImage(img, nw, nh)
 
-	var buf bytes.Buffer
-	if err := webpenc.Encode(&buf, dst, webpenc.Options{Quality: 78}); err != nil {
+	out, err := encodeLossyWebP(dst, VariantWebPQuality)
+	if err != nil {
 		return nil, err
 	}
 	// 原子落缓存（失败仅影响下次重复生成，不阻断响应）
-	if err := os.MkdirAll(filepath.Dir(thumbPath), 0o755); err == nil {
-		tmp := thumbPath + ".partial"
-		if err := os.WriteFile(tmp, buf.Bytes(), 0o644); err == nil {
-			if err := os.Rename(tmp, thumbPath); err != nil {
-				_ = os.Remove(tmp)
-			}
-		}
-	}
-	return buf.Bytes(), nil
+	_ = atomicWriteFile(thumbPath, out)
+	return out, nil
 }

backend/service/operations_mail.go

@@ -402,6 +402,7 @@ func (o *Operations) SendCode(email, purpose, ip string) (int, error) {
 	})
 	return 0, e
 }
+
 const (
 	codeVerifyMaxAttempts = 5
 	codeVerifyWindow      = 15 * 60 // 秒，与验证码有效期一致

backend/service/overview.go

@@ -72,18 +72,18 @@ type NewUserItem struct {
 
 // OverviewData 首页聚合数据
 type OverviewData struct {
-	Stats              OverviewStats      `json:"stats"`
-	Hot                []PostListItem     `json:"hot"`
-	ActiveUsers        []ActiveUser       `json:"active_users"`
-	Boards             []BoardCount       `json:"boards"`
-	Announcements      []AnnouncementItem `json:"announcements"`
-	AnnouncementsTotal int64              `json:"announcements_total"`
-	SidebarPages       []SidebarPageItem  `json:"sidebar_pages"`
-	NewUsers           []NewUserItem      `json:"new_users"`
-	Checkin            *CheckinStatus     `json:"checkin,omitempty"`
-	Ads                []PublicAdItem     `json:"ads"`
-	AdsPanelTitle      string             `json:"ads_panel_title"`
-	AdsEnabled         bool               `json:"ads_enabled"`
+	Stats              OverviewStats       `json:"stats"`
+	Hot                []PostListItem      `json:"hot"`
+	ActiveUsers        []ActiveUser        `json:"active_users"`
+	Boards             []BoardCount        `json:"boards"`
+	Announcements      []AnnouncementItem  `json:"announcements"`
+	AnnouncementsTotal int64               `json:"announcements_total"`
+	SidebarPages       []SidebarPageItem   `json:"sidebar_pages"`
+	NewUsers           []NewUserItem       `json:"new_users"`
+	Checkin            *CheckinStatus      `json:"checkin,omitempty"`
+	Ads                []PublicAdItem      `json:"ads"`
+	AdsPanelTitle      string              `json:"ads_panel_title"`
+	AdsEnabled         bool                `json:"ads_enabled"`
 	Sponsors           []PublicSponsorItem `json:"sponsors"`
 	SponsorsPanelTitle string              `json:"sponsors_panel_title"`
 	SponsorsEnabled    bool                `json:"sponsors_enabled"`

backend/service/post.go

@@ -457,37 +457,37 @@ type PostAttachmentDTO struct {
 
 // PostDetail 帖子详情（含可见性裁剪与附件）
 type PostDetail struct {
-	ID            uint                `json:"id"`
-	BoardID       uint                `json:"board_id"`
-	UserID        uint                `json:"user_id"`
-	Title         string              `json:"title"`
-	Content       string              `json:"content"`
-	Tags          string              `json:"tags"`
-	PostType      string              `json:"post_type"`
-	ContentAccess string              `json:"content_access"`
-	AccessPoints  int                 `json:"access_points"`
-	TypeMeta      string              `json:"type_meta"`
-	TypeStatus    string              `json:"type_status,omitempty"`
-	Pinned        int                 `json:"pinned"`
-	Recommended   bool                `json:"recommended"`
-	Locked        bool                `json:"locked"` // 管理员手动锁定：普通用户不可编辑/回复（staff 豁免）
-	Status        string              `json:"status"`
-	LikeCount     int                 `json:"like_count"`
-	ViewCount     int                 `json:"view_count"`
-	CommentCount  int                 `json:"comment_count"`
-	Liked         bool                `json:"liked"`
-	Favorited     bool                `json:"favorited"` // 当前查看者是否已收藏（详情接口实时填充）
-	Edited        bool                `json:"edited"`    // 是否存在编辑历史快照（决定"更新于/编辑历史"入口展示）
+	ID            uint   `json:"id"`
+	BoardID       uint   `json:"board_id"`
+	UserID        uint   `json:"user_id"`
+	Title         string `json:"title"`
+	Content       string `json:"content"`
+	Tags          string `json:"tags"`
+	PostType      string `json:"post_type"`
+	ContentAccess string `json:"content_access"`
+	AccessPoints  int    `json:"access_points"`
+	TypeMeta      string `json:"type_meta"`
+	TypeStatus    string `json:"type_status,omitempty"`
+	Pinned        int    `json:"pinned"`
+	Recommended   bool   `json:"recommended"`
+	Locked        bool   `json:"locked"` // 管理员手动锁定：普通用户不可编辑/回复（staff 豁免）
+	Status        string `json:"status"`
+	LikeCount     int    `json:"like_count"`
+	ViewCount     int    `json:"view_count"`
+	CommentCount  int    `json:"comment_count"`
+	Liked         bool   `json:"liked"`
+	Favorited     bool   `json:"favorited"` // 当前查看者是否已收藏（详情接口实时填充）
+	Edited        bool   `json:"edited"`    // 是否存在编辑历史快照（决定"更新于/编辑历史"入口展示）
 	// 最后一条已发布评论时间；null=无回复（旧帖判定回落 created_at）
 	LastReplyAt *time.Time `json:"last_reply_at,omitempty"`
 	// 旧帖回复确认提示：按查看者实时计算，命中才返回；前端存在即弹确认框
-	NecroReply    *NecroReplyHint `json:"necro_reply,omitempty"`
-	CreatedAt     time.Time       `json:"created_at"`
-	UpdatedAt     time.Time       `json:"updated_at"`
-	Board         model.Board     `json:"board"`
-	User          model.User      `json:"user"`
-	ContentLocked bool            `json:"content_locked"`
-	AccessHint    string          `json:"access_hint,omitempty"`
+	NecroReply    *NecroReplyHint     `json:"necro_reply,omitempty"`
+	CreatedAt     time.Time           `json:"created_at"`
+	UpdatedAt     time.Time           `json:"updated_at"`
+	Board         model.Board         `json:"board"`
+	User          model.User          `json:"user"`
+	ContentLocked bool                `json:"content_locked"`
+	AccessHint    string              `json:"access_hint,omitempty"`
 	Attachments   []PostAttachmentDTO `json:"attachments"`
 	Question      *QuestionState      `json:"question,omitempty"`
 	Poll          *PollState          `json:"poll,omitempty"`
@@ -620,7 +620,7 @@ func buildPostDetail(post *model.Post) *PostDetail {
 		ContentAccess: model.NormalizeContentAccess(post.ContentAccess),
 		AccessPoints:  post.AccessPoints, TypeMeta: post.TypeMeta,
 		TypeStatus: ComputeTypeStatus(post.PostType, post.TypeMeta),
-		Pinned: post.Pinned, Recommended: post.Recommended, Locked: post.Locked, Status: post.Status,
+		Pinned:     post.Pinned, Recommended: post.Recommended, Locked: post.Locked, Status: post.Status,
 		LikeCount: post.LikeCount, ViewCount: post.ViewCount, CommentCount: post.CommentCount,
 		Liked: post.Liked, CreatedAt: post.CreatedAt, UpdatedAt: post.UpdatedAt,
 		Board: post.Board, User: post.User,

backend/service/post_interact.go

@@ -472,6 +472,7 @@ func EnsureDeadlineOnPublish(typeMeta, postType string, publishedAt time.Time) (
 type AcceptedAnswer struct {
 	ID        uint               `json:"id"`
 	Floor     int                `json:"floor"`
+	IsRoot    bool               `json:"is_root"` // false = 楼中楼回复，锚点需 #comment-{floor}-r{id}
 	Content   string             `json:"content"`
 	CreatedAt time.Time          `json:"created_at"`
 	Deleted   bool               `json:"deleted,omitempty"`
@@ -736,6 +737,7 @@ func (s *PostService) loadAcceptedAnswer(postID, commentID uint, floor int, view
 	ans := &AcceptedAnswer{
 		ID:        c.ID,
 		Floor:     floor,
+		IsRoot:    c.ParentID == nil,
 		CreatedAt: c.CreatedAt,
 	}
 	staff := c.DeletedAt.Valid && c.DeletedBy != 0 && c.DeletedBy != c.UserID

backend/service/setting.go

@@ -66,7 +66,7 @@ const (
 	SettingKeyNecroReplyPenalty    = "necro_reply_penalty"     // 旧帖回复扣除积分；0=仅提醒不扣分
 
 	// 积分增长规则（正整数奖励；0=关闭/不限，缺行=默认值）
-	SettingKeyPointsCheckinBase     = "points_checkin_base"     // 签到基础分；缺行=5
+	SettingKeyPointsCheckinBase     = "points_checkin_base"      // 签到基础分；缺行=5
 	SettingKeyPointsStreakEveryDays = "points_streak_every_days" // 每满 N 天连续签到触发加成；0=关闭；缺行=7
 	SettingKeyPointsStreakBonus     = "points_streak_bonus"      // 触发加成时额外加分；缺行=0
 	SettingKeyPointsPostReward      = "points_post_reward"       // 发帖奖励；0=关闭；缺行=0
@@ -83,6 +83,10 @@ const (
 
 	// SettingKeyUrlStyle 详情页伪静态风格；缺行视为 default（标准动态路由风格）
 	SettingKeyUrlStyle = "url_style"
+
+	// SettingKeyMobileTabs 移动端底栏显示的 tab（JSON []string，元素取值见 MobileTabKeys）；
+	// 缺行/非法/为空视为全量默认
+	SettingKeyMobileTabs = "mobile_tabs"
 )
 
 const (
@@ -118,8 +122,19 @@ const (
 
 	// DefaultUrlStyle 标准动态路由风格（/post/123）
 	DefaultUrlStyle = "default"
+
+	// MaxMobileTabs 底栏配置元素上限（与白名单等长）
+	MaxMobileTabs = 5
 )
 
+// MobileTabKeys 移动端底栏允许的 tab key 白名单（同时是默认顺序，与前端 lib/mobileTabs.ts 保持一致）
+var MobileTabKeys = []string{"home", "library", "compose", "messages", "me"}
+
+// DefaultMobileTabs 底栏默认全量配置
+func DefaultMobileTabs() []string {
+	return append([]string(nil), MobileTabKeys...)
+}
+
 // DefaultAttachmentExts 论坛向默认允许扩展名（含安装包/脚本/网页）
 var DefaultAttachmentExts = []string{
 	"pdf", "txt", "md", "csv", "json",
@@ -146,34 +161,34 @@ var accentHexRe = regexp.MustCompile(`^#[0-9a-fA-F]{6}$`)
 
 // PublicSiteSettings 对前台公开的站点配置（SEO / 注册入口 / 发帖冷静期提示）
 type PublicSiteSettings struct {
-	Accent               string       `json:"accent"`
-	TrustReviewedPublish bool         `json:"trust_reviewed_publish"`
-	PublishWithoutReview bool         `json:"publish_without_review"`
-	SiteName             string       `json:"site_name"`
-	SiteDescription      string       `json:"site_description"`
-	AllowRegister        bool         `json:"allow_register"`
-	AllowComments          bool         `json:"allow_comments"`
-	CommentsRequireLogin   bool         `json:"comments_require_login"`
-	AllowMessages          bool         `json:"allow_messages"`
-	PostCooldownHours    int          `json:"post_cooldown_hours"`
-	CodeBlockAutoFold    bool         `json:"code_block_auto_fold"`
-	CodeBlockFoldLines   int          `json:"code_block_fold_lines"`
-	UIAnimations         bool         `json:"ui_animations"`
-	AnimCodeFold         bool         `json:"anim_code_fold"`
-	AnimSmoothScroll     bool         `json:"anim_smooth_scroll"`
-	AnimChrome           bool         `json:"anim_chrome"`
-	PostLinkNewTab       bool         `json:"post_link_new_tab"`
-	AttachmentExtLimit   bool         `json:"attachment_ext_limit"`
-	AttachmentExts       []string     `json:"attachment_exts"`
-	AttachmentMaxMB      int          `json:"attachment_max_mb"`
-	AttachmentMaxCount   int          `json:"attachment_max_count"`
-	ImageMaxMB           int          `json:"image_max_mb"`
+	Accent               string   `json:"accent"`
+	TrustReviewedPublish bool     `json:"trust_reviewed_publish"`
+	PublishWithoutReview bool     `json:"publish_without_review"`
+	SiteName             string   `json:"site_name"`
+	SiteDescription      string   `json:"site_description"`
+	AllowRegister        bool     `json:"allow_register"`
+	AllowComments        bool     `json:"allow_comments"`
+	CommentsRequireLogin bool     `json:"comments_require_login"`
+	AllowMessages        bool     `json:"allow_messages"`
+	PostCooldownHours    int      `json:"post_cooldown_hours"`
+	CodeBlockAutoFold    bool     `json:"code_block_auto_fold"`
+	CodeBlockFoldLines   int      `json:"code_block_fold_lines"`
+	UIAnimations         bool     `json:"ui_animations"`
+	AnimCodeFold         bool     `json:"anim_code_fold"`
+	AnimSmoothScroll     bool     `json:"anim_smooth_scroll"`
+	AnimChrome           bool     `json:"anim_chrome"`
+	PostLinkNewTab       bool     `json:"post_link_new_tab"`
+	AttachmentExtLimit   bool     `json:"attachment_ext_limit"`
+	AttachmentExts       []string `json:"attachment_exts"`
+	AttachmentMaxMB      int      `json:"attachment_max_mb"`
+	AttachmentMaxCount   int      `json:"attachment_max_count"`
+	ImageMaxMB           int      `json:"image_max_mb"`
 
 	// 内容锁定与旧帖回复（0=关闭；公开保持规则透明）
-	PostEditLockHours    int `json:"post_edit_lock_hours"`
-	CommentEditLockHours int `json:"comment_edit_lock_hours"`
-	NecroReplyAfterHours int `json:"necro_reply_after_hours"`
-	NecroReplyPenalty    int `json:"necro_reply_penalty"`
+	PostEditLockHours    int          `json:"post_edit_lock_hours"`
+	CommentEditLockHours int          `json:"comment_edit_lock_hours"`
+	NecroReplyAfterHours int          `json:"necro_reply_after_hours"`
+	NecroReplyPenalty    int          `json:"necro_reply_penalty"`
 	BgSiteURL            string       `json:"bg_site_url"`
 	BgSiteMode           string       `json:"bg_site_mode"`
 	BgAdminURL           string       `json:"bg_admin_url"`
@@ -206,6 +221,12 @@ type PublicSiteSettings struct {
 
 	// UrlStyle 详情页伪静态风格：default（/post/123）、html（/post-123.html）、discuz（/thread-123.html）
 	UrlStyle string `json:"url_style"`
+
+	// MobileTabs 移动端底栏显示的 tab（有序子集，数组顺序即展示顺序）；空/非法由读取端回落默认
+	MobileTabs []string `json:"mobile_tabs"`
+
+	// HeaderNav 桌面端 Header 主导航（数组顺序即展示顺序）；空数组=全部隐藏；缺省=内置三项
+	HeaderNav []HeaderNavItem `json:"header_nav"`
 }
 
 // SettingService 站点级键值设置
@@ -310,6 +331,7 @@ func (s *SettingService) Public() (PublicSiteSettings, error) {
 		BrandLogoFit:         BrandLogoFitContain,
 		FooterLinks:          []FooterLink{},
 		UrlStyle:             DefaultUrlStyle,
+		HeaderNav:            DefaultHeaderNav(),
 	}
 	accent, err := s.AccentColor()
 	if err != nil {
@@ -513,6 +535,9 @@ func (s *SettingService) Public() (PublicSiteSettings, error) {
 	}
 	out.UrlStyle = urlStyle
 
+	out.MobileTabs = s.MobileTabs()
+	out.HeaderNav = s.HeaderNav()
+
 	if err := s.fillBrand(&out); err != nil {
 		return out, err
 	}
@@ -551,6 +576,84 @@ func (s *SettingService) SetUrlStyle(style string) error {
 	return ErrInvalidSiteSetting
 }
 
+// normalizeMobileTabs 校验底栏 tab 列表：去空白、去重、只留白名单内元素
+func normalizeMobileTabs(tabs []string) ([]string, bool) {
+	allowed := make(map[string]struct{}, len(MobileTabKeys))
+	for _, k := range MobileTabKeys {
+		allowed[k] = struct{}{}
+	}
+	seen := make(map[string]struct{}, len(tabs))
+	out := make([]string, 0, len(tabs))
+	for _, t := range tabs {
+		k := strings.TrimSpace(strings.ToLower(t))
+		if k == "" {
+			continue
+		}
+		if _, ok := allowed[k]; !ok {
+			return nil, false
+		}
+		if _, dup := seen[k]; dup {
+			continue
+		}
+		seen[k] = struct{}{}
+		out = append(out, k)
+		if len(out) > MaxMobileTabs {
+			return nil, false
+		}
+	}
+	return out, true
+}
+
+// mobileTabsEqual 判断两个列表是否元素一致（忽略顺序）
+func mobileTabsEqual(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	set := make(map[string]struct{}, len(b))
+	for _, k := range b {
+		set[k] = struct{}{}
+	}
+	for _, k := range a {
+		if _, ok := set[k]; !ok {
+			return false
+		}
+	}
+	return true
+}
+
+// MobileTabs 移动端底栏配置；缺行/为空/非法/解析失败回落默认全量
+func (s *SettingService) MobileTabs() []string {
+	v, found, err := s.getValue(SettingKeyMobileTabs)
+	if err != nil || !found || strings.TrimSpace(v) == "" {
+		return DefaultMobileTabs()
+	}
+	var tabs []string
+	if err := json.Unmarshal([]byte(v), &tabs); err != nil {
+		return DefaultMobileTabs()
+	}
+	out, ok := normalizeMobileTabs(tabs)
+	if !ok || len(out) == 0 {
+		return DefaultMobileTabs()
+	}
+	return out
+}
+
+// SetMobileTabs 校验并保存底栏配置；与默认全量一致时删键保持「缺行=默认」语义
+func (s *SettingService) SetMobileTabs(tabs []string) error {
+	out, ok := normalizeMobileTabs(tabs)
+	if !ok || len(out) == 0 {
+		return ErrInvalidSiteSetting
+	}
+	if mobileTabsEqual(out, MobileTabKeys) {
+		return s.deleteKey(SettingKeyMobileTabs)
+	}
+	b, err := json.Marshal(out)
+	if err != nil {
+		return err
+	}
+	return s.putValue(SettingKeyMobileTabs, string(b))
+}
+
 // AccentColor 返回配置的主题色（小写 #rrggbb）；未配置时返回空串，表示走前端默认色
 func (s *SettingService) AccentColor() (string, error) {
 	v, found, err := s.getValue(SettingKeyAccent)

backend/service/site_page.go

@@ -11,7 +11,10 @@ import (
 	"gorm.io/gorm"
 )
 
-var sitePageSlugRe = regexp.MustCompile(`^[a-z0-9]+(?:-[a-z0-9]+)*$`)
+var (
+	sitePageSlugRe        = regexp.MustCompile(`^[a-z0-9]+(?:-[a-z0-9]+)*$`)
+	ErrSitePageNotDeleted = errors.New("仅已删除的单页可彻底删除")
+)
 
 // 写入时显式列出字段（须为独立 Select 参数；逗号拼成一串会被 GORM 当成单个非法字段名）
 var sitePageWriteFields = []string{
@@ -116,16 +119,27 @@ func (in *SitePageInput) applyTo(p *model.SitePage) {
 	}
 }
 
-func (s *SitePageService) slugTaken(slug string, excludeID uint) (bool, error) {
-	q := s.db.Model(&model.SitePage{}).Where("slug = ?", slug)
+// slugTaken 查询 slug 占用情况（Unscoped 含软删行：软删行仍占用数据库唯一索引）
+// active=在用单页占用；deleted=已删除单页占用
+func (s *SitePageService) slugTaken(slug string, excludeID uint) (active, deleted bool, err error) {
+	q := s.db.Unscoped().Model(&model.SitePage{}).Where("slug = ?", slug).Select("deleted_at")
 	if excludeID > 0 {
 		q = q.Where("id <> ?", excludeID)
 	}
-	var n int64
-	if err := q.Count(&n).Error; err != nil {
-		return false, err
+	var rows []struct {
+		DeletedAt gorm.DeletedAt
 	}
-	return n > 0, nil
+	if err := q.Find(&rows).Error; err != nil {
+		return false, false, err
+	}
+	for _, r := range rows {
+		if r.DeletedAt.Valid {
+			deleted = true
+		} else {
+			active = true
+		}
+	}
+	return active, deleted, nil
 }
 
 // ListSidebarPublished 首页右栏：已发布且勾选侧栏展示
@@ -179,11 +193,23 @@ func (s *SitePageService) GetPublishedBySlug(slug string) (*model.SitePage, erro
 	return &p, nil
 }
 
-// ListAll 管理后台全部单页
-func (s *SitePageService) ListAll() ([]model.SitePage, error) {
-	var list []model.SitePage
-	err := s.db.Order("sort_order ASC, id ASC").Limit(100).Find(&list).Error
-	return list, err
+// SitePageAdminItem 管理端单页（附 deleted 标记；DeletedAt json:"-" 不出模型）
+type SitePageAdminItem struct {
+	model.SitePage
+	Deleted bool `json:"deleted"`
+}
+
+// ListAll 管理后台全部单页（含已软删，仅供查看与彻底删除）
+func (s *SitePageService) ListAll() ([]SitePageAdminItem, error) {
+	var pages []model.SitePage
+	if err := s.db.Unscoped().Order("sort_order ASC, id ASC").Limit(100).Find(&pages).Error; err != nil {
+		return nil, err
+	}
+	out := make([]SitePageAdminItem, 0, len(pages))
+	for _, p := range pages {
+		out = append(out, SitePageAdminItem{SitePage: p, Deleted: p.DeletedAt.Valid})
+	}
+	return out, nil
 }
 
 // Get 管理后台按 ID 取单页
@@ -200,13 +226,16 @@ func (s *SitePageService) Create(in *SitePageInput) (*model.SitePage, error) {
 	if err := in.normalize(nil); err != nil {
 		return nil, err
 	}
-	taken, err := s.slugTaken(in.Slug, 0)
+	active, deleted, err := s.slugTaken(in.Slug, 0)
 	if err != nil {
 		return nil, err
 	}
-	if taken {
+	if active {
 		return nil, errors.New("slug 已被占用")
 	}
+	if deleted {
+		return nil, errors.New("该地址已被已删除单页占用，可在单页管理列表中彻底删除后重新使用")
+	}
 	p := &model.SitePage{
 		Published:     false,
 		ShowInSidebar: false,
@@ -229,13 +258,16 @@ func (s *SitePageService) Update(id uint, in *SitePageInput) (*model.SitePage, e
 	if err := in.normalize(&p); err != nil {
 		return nil, err
 	}
-	taken, err := s.slugTaken(in.Slug, id)
+	active, deleted, err := s.slugTaken(in.Slug, id)
 	if err != nil {
 		return nil, err
 	}
-	if taken {
+	if active {
 		return nil, errors.New("slug 已被占用")
 	}
+	if deleted {
+		return nil, errors.New("该地址已被已删除单页占用，可在单页管理列表中彻底删除后重新使用")
+	}
 	in.applyTo(&p)
 	// 用 map 更新，确保 false / 空串也会写入；勿用逗号拼接的 Select+Save（只会改 updated_at）
 	if err := s.db.Model(&model.SitePage{}).Where("id = ?", p.ID).Updates(map[string]interface{}{
@@ -264,3 +296,15 @@ func (s *SitePageService) Delete(id uint) error {
 	}
 	return nil
 }
+
+// Purge 彻底删除已软删的单页（slug 释放可复用）
+func (s *SitePageService) Purge(id uint) error {
+	var p model.SitePage
+	if err := s.db.Unscoped().First(&p, id).Error; err != nil {
+		return gorm.ErrRecordNotFound
+	}
+	if !p.DeletedAt.Valid {
+		return ErrSitePageNotDeleted
+	}
+	return s.db.Unscoped().Delete(&p).Error
+}

backend/service/site_page_test.go

@@ -0,0 +1,69 @@
+package service
+
+import (
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func newSitePageTestService(t *testing.T) *SitePageService {
+	t.Helper()
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.SitePage{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	return NewSitePageService(db)
+}
+
+func sitePageInput(slug, title string) *SitePageInput {
+	return &SitePageInput{Slug: slug, Title: title, Content: "正文内容"}
+}
+
+func TestSitePageSlugReuseAfterSoftDelete(t *testing.T) {
+	s := newSitePageTestService(t)
+	p, err := s.Create(sitePageInput("test", "测试"))
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	if err := s.Delete(p.ID); err != nil {
+		t.Fatalf("delete: %v", err)
+	}
+
+	// 软删后重建同 slug：报"已删除"提示而非数据库唯一索引错误
+	_, err = s.Create(sitePageInput("test", "重建"))
+	if err == nil || !strings.Contains(err.Error(), "已删除") {
+		t.Fatalf("软删后重建应提示已删除单页占用，got %v", err)
+	}
+
+	// 管理端列表含软删行且带 deleted 标记
+	all, err := s.ListAll()
+	if err != nil {
+		t.Fatalf("ListAll: %v", err)
+	}
+	if len(all) != 1 || !all[0].Deleted || all[0].Slug != "test" {
+		t.Fatalf("ListAll 应含软删单页且 Deleted=true，got %+v", all)
+	}
+
+	// 彻底删除后可重建
+	if err := s.Purge(p.ID); err != nil {
+		t.Fatalf("purge: %v", err)
+	}
+	if _, err := s.Create(sitePageInput("test", "重建")); err != nil {
+		t.Fatalf("purge 后重建同 slug 不应报错: %v", err)
+	}
+}
+
+func TestSitePagePurgeRequiresDeleted(t *testing.T) {
+	s := newSitePageTestService(t)
+	p, _ := s.Create(sitePageInput("alive", "在用"))
+	if err := s.Purge(p.ID); err == nil || !errors.Is(err, ErrSitePageNotDeleted) {
+		t.Fatalf("未删单页 Purge 应拒绝，got %v", err)
+	}
+}

backend/service/timeline_release.go

@@ -0,0 +1,371 @@
+package service
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strings"
+)
+
+const (
+	timelineReleaseMaxPages = 10
+	timelineReleaseMaxItems = 100
+)
+
+// timelineReleaseSource 内置 Release 适配（Gitea + GitHub）
+type timelineReleaseSource struct {
+	id         string
+	host       string // 精确主机或 "*"（通配）
+	listPath   string // releases 页正则
+	apiURL     string // API 模板
+	query      map[string]string
+	headers    map[string]string
+	pagination string // link_header | query_page
+	dateField  string // 优先取的字段：published_at / created_at
+}
+
+var timelineReleaseSources = []timelineReleaseSource{
+	{
+		id:         "github_release",
+		host:       "github.com",
+		listPath:   `^/(?P<owner>[^/]+)/(?P<repo>[^/]+)/releases/?$`,
+		apiURL:     "https://api.github.com/repos/{owner}/{repo}/releases",
+		query:      map[string]string{"per_page": "100", "page": "{page}"},
+		headers:    map[string]string{"User-Agent": "jiang13-bbs", "Accept": "application/vnd.github+json"},
+		pagination: "link_header",
+		dateField:  "published_at",
+	},
+	{
+		id:         "gitea_release",
+		host:       "*",
+		listPath:   `^/(?P<owner>[^/]+)/(?P<repo>[^/]+)/releases/?$`,
+		apiURL:     "https://{host}/api/v1/repos/{owner}/{repo}/releases",
+		query:      map[string]string{"limit": "50", "page": "{page}"},
+		headers:    map[string]string{"User-Agent": "jiang13-bbs", "Accept": "application/json"},
+		pagination: "query_page",
+		dateField:  "created_at",
+	},
+}
+
+// matchReleaseSource 按 host + path 匹配内置 release 适配
+func matchReleaseSource(host, path string) (*timelineReleaseSource, map[string]string, error) {
+	for i := range timelineReleaseSources {
+		src := &timelineReleaseSources[i]
+		if src.host != "*" && !strings.EqualFold(src.host, host) {
+			continue
+		}
+		if src.host == "*" && strings.EqualFold(host, "github.com") {
+			continue
+		}
+		re, err := regexp.Compile(src.listPath)
+		if err != nil {
+			continue
+		}
+		if m := re.FindStringSubmatch(path); m != nil {
+			return src, subexpMap(re, m), nil
+		}
+	}
+	return nil, nil, errors.New("地址不符或主机未配置")
+}
+
+// ImportTimelineFromReleases 按 releases 页 URL 拉取并解析发布记录
+func (s *SettingService) ImportTimelineFromReleases(urls []string) (*TimelineGitImportResult, error) {
+	cleanURLs := make([]string, 0, len(urls))
+	for _, u := range urls {
+		u = strings.TrimSpace(u)
+		if u != "" {
+			cleanURLs = append(cleanURLs, u)
+		}
+	}
+	if len(cleanURLs) == 0 {
+		return nil, errors.New("请提供至少一条 URL")
+	}
+	if len(cleanURLs) > 20 {
+		return nil, errors.New("一次最多 20 条 URL")
+	}
+
+	client := &http.Client{
+		Timeout: timelineGitHTTPTimeout,
+		Transport: &http.Transport{
+			DialContext:         publicOnlyDial,
+			TLSHandshakeTimeout: timelineGitHTTPTimeout,
+			ForceAttemptHTTP2:   true,
+		},
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			if len(via) >= 3 {
+				return errors.New("重定向过多")
+			}
+			if err := assertSafeHTTPSURL(req.URL); err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+
+	seenURL := map[string]bool{}
+	var items []TimelineGitItem
+	var failMsgs []string
+	truncated := false
+
+	for _, rawURL := range cleanURLs {
+		part, partTrunc, err := s.importOneReleaseURL(client, rawURL, seenURL, timelineReleaseMaxItems-len(items))
+		if err != nil {
+			failMsgs = append(failMsgs, fmt.Sprintf("%s：%s", truncateTimelineStr(rawURL, 80), err.Error()))
+			continue
+		}
+		items = append(items, part...)
+		if partTrunc {
+			truncated = true
+		}
+		if len(items) >= timelineReleaseMaxItems {
+			truncated = true
+			break
+		}
+	}
+
+	out := &TimelineGitImportResult{Items: items}
+	if truncated {
+		out.Warning = fmt.Sprintf("已达上限（最多 %d 条），可再贴后续页 URL", timelineReleaseMaxItems)
+	}
+	if len(failMsgs) > 0 {
+		out.Error = strings.Join(failMsgs, "；")
+	}
+	if len(items) == 0 && out.Error == "" {
+		out.Error = "未能解析出 Release"
+	}
+	return out, nil
+}
+
+func (s *SettingService) importOneReleaseURL(
+	client *http.Client,
+	rawURL string,
+	seenURL map[string]bool,
+	remain int,
+) ([]TimelineGitItem, bool, error) {
+	if remain <= 0 {
+		return nil, true, nil
+	}
+	u, err := url.Parse(rawURL)
+	if err != nil || u.Scheme == "" || u.Host == "" {
+		return nil, false, errors.New("URL 无效")
+	}
+	if err := assertSafeHTTPSURL(u); err != nil {
+		return nil, false, err
+	}
+	host := strings.ToLower(u.Hostname())
+	path := u.EscapedPath()
+	if path == "" {
+		path = "/"
+	}
+
+	src, caps, err := matchReleaseSource(host, path)
+	if err != nil {
+		return nil, false, err
+	}
+	if !repoNameRe.MatchString(caps["owner"]) || !repoNameRe.MatchString(caps["repo"]) {
+		return nil, false, errors.New("仓库名非法")
+	}
+
+	startPage := 1
+	if p := u.Query().Get("page"); p != "" {
+		if n, e := parseIntPage(p); e == nil && n >= 1 {
+			startPage = n
+		}
+	}
+
+	var out []TimelineGitItem
+	truncated := false
+	page := startPage
+	maxPages := timelineReleaseMaxPages
+	pagesDone := 0
+	nextURL := ""
+
+	for pagesDone < maxPages && len(out) < remain {
+		var apiURL string
+		if nextURL != "" {
+			apiURL = nextURL
+			nextURL = ""
+		} else {
+			apiURL = expandTemplate(src.apiURL, host, caps, page)
+			q := url.Values{}
+			for k, v := range src.query {
+				q.Set(k, expandTemplate(v, host, caps, page))
+			}
+			parsed, e := url.Parse(apiURL)
+			if e != nil {
+				return out, truncated, errors.New("API URL 无效")
+			}
+			if len(q) > 0 {
+				existing := parsed.Query()
+				for k, vs := range q {
+					existing.Set(k, vs[0])
+				}
+				parsed.RawQuery = existing.Encode()
+			}
+			apiURL = parsed.String()
+		}
+		parsedAPI, err := url.Parse(apiURL)
+		if err != nil {
+			return out, truncated, errors.New("API URL 无效")
+		}
+		if err := assertSafeHTTPSURL(parsedAPI); err != nil {
+			return out, truncated, err
+		}
+
+		headers := http.Header{}
+		for k, v := range src.headers {
+			if allowedAdapterHeaders[strings.ToLower(k)] {
+				headers.Set(k, v)
+			}
+		}
+		if headers.Get("User-Agent") == "" {
+			headers.Set("User-Agent", "jiang13-bbs")
+		}
+
+		body, linkNext, status, err := httpGetLimited(client, parsedAPI.String(), headers)
+		if err != nil {
+			return out, truncated, err
+		}
+		if status == 404 || status == 401 || status == 403 {
+			return out, truncated, errors.New("无法读取该仓库（私有、不存在或无权访问）")
+		}
+		if status == 429 {
+			return out, truncated, errors.New("远端限流，请稍后再试")
+		}
+		if status < 200 || status >= 300 {
+			return out, truncated, fmt.Errorf("远端返回 %d", status)
+		}
+
+		pageItems, err := parseReleaseListJSON(body, src, host)
+		if err != nil {
+			return out, truncated, err
+		}
+		if len(pageItems) == 0 {
+			break
+		}
+		for _, it := range pageItems {
+			if it.SourceURL != "" && seenURL[it.SourceURL] {
+				continue
+			}
+			if it.SourceURL != "" {
+				seenURL[it.SourceURL] = true
+			}
+			out = append(out, it)
+			if len(out) >= remain {
+				truncated = true
+				break
+			}
+		}
+		pagesDone++
+		if src.pagination == "link_header" && linkNext != "" {
+			nu, e := url.Parse(linkNext)
+			if e != nil || assertSafeHTTPSURL(nu) != nil {
+				break
+			}
+			nextURL = nu.String()
+		} else if src.pagination == "query_page" {
+			page++
+		} else {
+			break
+		}
+	}
+	if pagesDone >= maxPages {
+		truncated = true
+	}
+	return out, truncated, nil
+}
+
+func parseReleaseListJSON(body []byte, src *timelineReleaseSource, host string) ([]TimelineGitItem, error) {
+	var root any
+	if err := json.Unmarshal(body, &root); err != nil {
+		return nil, errors.New("响应非 JSON")
+	}
+	arr, ok := root.([]any)
+	if !ok {
+		return nil, errors.New("响应不是 Release 列表")
+	}
+	var out []TimelineGitItem
+	for _, el := range arr {
+		item, ok := mapReleaseObject(el, src, host)
+		if !ok {
+			continue
+		}
+		out = append(out, item)
+	}
+	return out, nil
+}
+
+func mapReleaseObject(el any, src *timelineReleaseSource, host string) (TimelineGitItem, bool) {
+	m, ok := el.(map[string]any)
+	if !ok {
+		return TimelineGitItem{}, false
+	}
+	// 跳过草稿
+	if draft, ok := m["draft"].(bool); ok && draft {
+		return TimelineGitItem{}, false
+	}
+	name := jsonStringField(m, "name")
+	tag := jsonStringField(m, "tag_name")
+	title := strings.TrimSpace(name)
+	if title == "" {
+		title = strings.TrimSpace(tag)
+	}
+	if title == "" {
+		return TimelineGitItem{}, false
+	}
+	body := jsonStringField(m, "body")
+	dateRaw := jsonStringField(m, src.dateField)
+	if dateRaw == "" {
+		// 兜底用 created_at
+		dateRaw = jsonStringField(m, "created_at")
+	}
+	srcURL := jsonStringField(m, "html_url")
+
+	title = sanitizeTimelinePlain(title, timelineTitleMax)
+	body = sanitizeTimelinePlain(body, timelineBodyMax)
+	title = neutralizeDirectivePlain(title)
+	body = neutralizeDirectivePlain(body)
+	date := parseCommitDate(dateRaw)
+	srcURL = sanitizeSourceURL(srcURL, host)
+	return TimelineGitItem{
+		Date:      date,
+		Title:     title,
+		Body:      body,
+		SourceURL: srcURL,
+	}, true
+}
+
+// jsonStringField 从 map[string]any 取字符串字段，兼容 string/number
+func jsonStringField(m map[string]any, key string) string {
+	v, ok := m[key]
+	if !ok || v == nil {
+		return ""
+	}
+	switch x := v.(type) {
+	case string:
+		return x
+	case float64:
+		return fmt.Sprintf("%v", x)
+	case json.Number:
+		return x.String()
+	default:
+		return fmt.Sprintf("%v", x)
+	}
+}
+
+func parseIntPage(s string) (int, error) {
+	n := 0
+	for _, r := range s {
+		if r < '0' || r > '9' {
+			return 0, errors.New("page 非数字")
+		}
+		n = n*10 + int(r-'0')
+		if n > 1_000_000 {
+			return 0, errors.New("page 过大")
+		}
+	}
+	return n, nil
+}

backend/service/upload.go

@@ -238,7 +238,7 @@ func (s *UploadService) transcodeImageToWebP(tmp, name, ext string) (string, str
 }
 
 // SaveImage 流式保存帖子插图：校验格式/大小/尺寸 → JPEG/PNG 转 WebP → 落盘 → 写 attachments（kind=image）
-func (s *UploadService) SaveImage(userID uint, src io.Reader) (*model.Attachment, error) {
+func (s *UploadService) SaveImage(userID uint, src io.Reader, source string) (*model.Attachment, error) {
 	if src == nil {
 		return nil, errors.New("文件为空")
 	}
@@ -354,6 +354,7 @@ func (s *UploadService) SaveImage(userID uint, src io.Reader) (*model.Attachment
 	att := &model.Attachment{
 		UserID: userID,
 		Kind:   model.AttachmentKindImage,
+		Source: normalizeImageSource(source),
 		URL:    "/uploads/images/" + storeName,
 		MIME:   storeMime,
 		Size:   int(storeSize),
@@ -585,6 +586,46 @@ func (s *UploadService) CopyBackgroundFromMedia(userID, attachmentID uint) (stri
 	return s.SaveBackground(f)
 }
 
+// normalizeImageSource 把外部传入的图片来源收敛到白名单，未知值回退为 post
+func normalizeImageSource(s string) string {
+	switch s {
+	case model.AttachmentSourceLibraryCover, model.AttachmentSourceLibraryContent:
+		return s
+	default:
+		return model.AttachmentSourcePost
+	}
+}
+
+// CopyImageFromMedia 把当前用户媒体库里的一张图复制一份新插图（落 uploads/images 并记一条本人附件）
+// 用于书籍封面等长期引用场景：与原图解耦，原图删除后副本仍可用
+// source 决定副本的来源标记（如 library_cover）
+func (s *UploadService) CopyImageFromMedia(userID, attachmentID uint, source string) (*model.Attachment, error) {
+	var att model.Attachment
+	if err := s.db.Where("id = ? AND user_id = ?", attachmentID, userID).First(&att).Error; err != nil {
+		return nil, errors.New("图片不存在或不属于你")
+	}
+	if strings.HasPrefix(att.URL, "/api/media/") && s.ops != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer cancel()
+		r, _, e := s.ops.OpenObject(ctx, RemoteObjectID(att.URL), true)
+		if e != nil {
+			return nil, e
+		}
+		defer r.Close()
+		return s.SaveImage(userID, r, source)
+	}
+	abs, ok := s.safeUploadPath(att.URL)
+	if !ok {
+		return nil, errors.New("无效的图片地址")
+	}
+	f, err := os.Open(abs)
+	if err != nil {
+		return nil, errors.New("读取图片失败")
+	}
+	defer f.Close()
+	return s.SaveImage(userID, f, source)
+}
+
 // BackgroundFileExists 确认 URL 对应文件在 backgrounds 目录内
 func (s *UploadService) BackgroundFileExists(url string) bool {
 	rel := BgRelPath(url)
@@ -638,6 +679,15 @@ func (s *UploadService) ListMedia(userID uint) ([]model.Attachment, error) {
 	return list, err
 }
 
+// FindMediaBySource 按来源查本人附件（存在返回记录，不存在返回 error）
+func (s *UploadService) FindMediaBySource(userID, attachmentID uint, source string) (*model.Attachment, error) {
+	var att model.Attachment
+	if err := s.db.Where("id = ? AND user_id = ? AND source = ?", attachmentID, userID, source).First(&att).Error; err != nil {
+		return nil, err
+	}
+	return &att, nil
+}
+
 // ErrAttachmentInUse 图片正被帖子内容引用，不可物理删除
 var ErrAttachmentInUse = errors.New("该图片已被帖子使用，无法删除")
 

backend/service/upload_webp_test.go

@@ -60,7 +60,7 @@ func TestSaveImageTranscodesJPEGToWebP(t *testing.T) {
 		t.Fatalf("encode jpeg: %v", err)
 	}
 
-	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()))
+	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()), "post")
 	if err != nil {
 		t.Fatalf("SaveImage: %v", err)
 	}
@@ -98,7 +98,7 @@ func TestSaveImageTranscodesPNGLosslessKeepsAlpha(t *testing.T) {
 		t.Fatalf("encode png: %v", err)
 	}
 
-	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()))
+	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()), "post")
 	if err != nil {
 		t.Fatalf("SaveImage: %v", err)
 	}
@@ -133,7 +133,7 @@ func TestSaveImageKeepsGIFAsIs(t *testing.T) {
 		t.Fatalf("encode gif: %v", err)
 	}
 
-	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()))
+	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()), "post")
 	if err != nil {
 		t.Fatalf("SaveImage: %v", err)
 	}
@@ -156,7 +156,7 @@ func TestSaveImageKeepsWebPAsIs(t *testing.T) {
 		t.Fatalf("encode webp: %v", err)
 	}
 
-	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()))
+	att, err := s.SaveImage(1, bytes.NewReader(in.Bytes()), "post")
 	if err != nil {
 		t.Fatalf("SaveImage: %v", err)
 	}

backend/service/visit_ref_test.go

@@ -29,3 +29,26 @@ func TestClassifyReferrer(t *testing.T) {
 		}
 	}
 }
+
+func TestDecodeSearchTerm(t *testing.T) {
+	// 「新人报道」的 UTF-8 百分号编码前缀，模拟 512 字节截断
+	news := "%E6%96%B0%E4%BA%BA%E6%8A%A5%E9%81%93"
+	cases := []struct {
+		raw  string
+		want string
+	}{
+		{"%E4%BD%A0%E5%A5%BD", "你好"},         // 完整编码
+		{"a+b", "a b"},                       // + 按空格解码
+		{"plain", "plain"},                   // 无编码
+		{"2222%E5%A6%82%E6%9E%9C", "2222如果"}, // 完整转义结尾
+		{news + "%E6%96", "新人报道"},            // 截断后结尾是完整转义但只是半截字符 → 去非法 UTF-8 尾巴
+		{news + "%E6%96%9", "新人报道"},          // 一位十六进制的残缺转义 → 剥尾重试 + 去半截字符
+		{news + "%", "新人报道"},                 // 截断在孤立的 %
+		{news + "%E", "新人报道"},                // 截断在 1 位十六进制
+	}
+	for _, c := range cases {
+		if got := decodeSearchTerm(c.raw); got != c.want {
+			t.Errorf("decodeSearchTerm(%q) = %q, want %q", c.raw, got, c.want)
+		}
+	}
+}

backend/service/visitstats_query.go

@@ -1,8 +1,11 @@
 package service
 
 import (
+	"net/url"
 	"strconv"
+	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/freefire/jiang13-bbs/model"
 	"gorm.io/gorm"
@@ -88,11 +91,11 @@ type VisitSourcesKindDay struct {
 
 // VisitSources 来源分析 Tab
 type VisitSources struct {
-	RangeDays  int                  `json:"range_days"`
-	Kinds      []VisitNamedCount    `json:"kinds"`
-	SearchHost []VisitNamedCount    `json:"search_hosts"`
-	External   []VisitNamedCount    `json:"external"`
-	Trend      []VisitSourcesKindDay `json:"trend"`
+	RangeDays   int                   `json:"range_days"`
+	Kinds       []VisitNamedCount     `json:"kinds"`
+	SearchTerms []VisitNamedCount     `json:"search_terms"` // 站内搜索词 Top N（/?q= 结果页浏览）
+	External    []VisitNamedCount     `json:"external"`
+	Trend       []VisitSourcesKindDay `json:"trend"`
 }
 
 // VisitPages 受访页面 Tab
@@ -336,8 +339,7 @@ func (s *VisitStatsService) Sources(rangeQ string) (*VisitSources, error) {
 	if out.Kinds, err = s.groupCounts(start, "ref_kind", model.VisitKindPageview, "", 8); err != nil {
 		return nil, err
 	}
-	if out.SearchHost, err = s.groupCounts(start, "ref_host", model.VisitKindPageview,
-		"ref_kind = '"+RefKindSearch+"'", 20); err != nil {
+	if out.SearchTerms, err = s.siteSearchTerms(start, 10); err != nil {
 		return nil, err
 	}
 	if out.External, err = s.groupCounts(start, "ref_host", model.VisitKindPageview,
@@ -350,6 +352,64 @@ func (s *VisitStatsService) Sources(rangeQ string) (*VisitSources, error) {
 	return out, nil
 }
 
+// siteSearchTerms 站内搜索词：聚合搜索结果页（/?q=…，path 记录完整 query）的浏览量。
+// 词以 URL 编码存于 path，按编码串分组后解码展示（站内 encodeURIComponent 编码确定性强）。
+func (s *VisitStatsService) siteSearchTerms(start time.Time, limit int) ([]VisitNamedCount, error) {
+	const expr = "substring(path from '[?&]q=([^&]*)')"
+	var rows []struct {
+		Key   string
+		Count int64
+	}
+	if err := s.db.Model(&model.VisitEvent{}).
+		Select(expr+" AS key, COUNT(*) AS count").
+		Where("created_at >= ? AND kind = ?", start, model.VisitKindPageview).
+		Where(expr + " IS NOT NULL AND " + expr + " <> ''").
+		Group("key").Order("count DESC").Limit(limit).
+		Scan(&rows).Error; err != nil {
+		return nil, err
+	}
+	out := make([]VisitNamedCount, 0, len(rows))
+	for _, r := range rows {
+		term := decodeSearchTerm(r.Key)
+		if runes := []rune(term); len(runes) > 30 {
+			term = string(runes[:30]) + "…"
+		}
+		out = append(out, VisitNamedCount{Key: term, Label: term, Count: r.Count})
+	}
+	return out, nil
+}
+
+// decodeSearchTerm 解码 path 里 q 参数值（URL 编码）。path 512 字节截断可能：
+// 1) 把 %XX 转义拦腰切断（孤 % / 一位十六进制）→ 整串解码失败，剥掉残缺尾部重试；
+// 2) 恰好切在多字节字符的转义序列中间 → 解码「成功」但尾部是半截字符，去掉非法 UTF-8 尾巴。
+func decodeSearchTerm(raw string) string {
+	term := strings.ReplaceAll(raw, "+", " ")
+	dec, err := url.QueryUnescape(term)
+	if err != nil {
+		// 残缺转义（如结尾孤 % 或一位十六进制）：剥掉最后一个 % 起的尾部重试
+		if i := strings.LastIndex(term, "%"); i > 0 {
+			dec, err = url.QueryUnescape(term[:i])
+		}
+	}
+	if err != nil {
+		return term
+	}
+	return validUTF8Prefix(dec)
+}
+
+// validUTF8Prefix 返回 s 的最长合法 UTF-8 前缀（截断产生的半截多字节字符会被去掉；
+// 真实的 U+FFFD 字符合法保留，与非法字节可区分）。
+func validUTF8Prefix(s string) string {
+	for i := 0; i < len(s); {
+		r, size := utf8.DecodeRuneInString(s[i:])
+		if r == utf8.RuneError && size == 1 {
+			return s[:i]
+		}
+		i += size
+	}
+	return s
+}
+
 // SourcesTrend 来源按日明细（kind 分列行）
 func (s *VisitStatsService) SourcesTrend(rangeQ string) ([]VisitSourcesKindDay, error) {
 	days := parseRangeDays(rangeQ)

frontend/app/about/page.tsx

@@ -9,7 +9,7 @@ import {
 } from "@/lib/api";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import { formatDate } from "@/lib/format";
 import { pageGlyph } from "@/lib/pageGlyph";
 import {
@@ -94,19 +94,13 @@ export default async function AboutIndexPage() {
   const announcements = overview?.announcements ?? [];
   const siteLead = settings.site_description?.trim() || undefined;
   const urlStyle = settings.url_style;
-  const canManagePages = !!me.user && isAdminOrAbove(me.user.role);
+  const canManagePages = !!me.user && hasPerm(me.user, PERMS.PAGES);
 
   const left = <SiteDocIdentity kind="about" lead={siteLead} />;
   const right = <SiteDocAnnoNav items={announcements} />;
 
   return (
-    <SiteDocShell
-      left={left}
-      right={right}
-      mobileExtras={
-        announcements.length > 0 ? <SiteDocAnnoNav items={announcements} /> : null
-      }
-    >
+    <SiteDocShell left={left} right={right}>
       <div className="panel overflow-hidden">
         <header
           className="px-5 sm:px-6 pt-5 pb-4"

frontend/app/admin/AdminSessionRecover.tsx

@@ -0,0 +1,141 @@
+"use client";
+
+import { useCallback, useEffect, useRef, useState } from "react";
+import { useRouter } from "next/navigation";
+import Link from "next/link";
+import { Loader2, RefreshCw, ShieldAlert } from "lucide-react";
+import { apiMe, apiRefresh } from "@/lib/api";
+import { hasAuthCookieHint } from "@/lib/cookies";
+
+/**
+ * 后台布局降级自愈：SSR 侧 /api/me 未识别出用户（access 过期轮转竞态、后端
+ * 瞬断等）时布局只能渲染无壳的降级卡片。本组件挂载后走客户端链路复判——
+ * apiMe 内部会在 401 时经 fetchWithRefresh 自动续期后重试：
+ *   - 复判出用户 → router.refresh() 让服务端重出完整后台壳（顶栏/抽屉回归）；
+ *   - 仍是游客且凭据已被清理 → 会话确实失效，带回归地址去登录页；
+ *   - 仍是游客但凭据还在（refresh 瞬态失败/后端暂不可用）→ 转入 offline 态，
+ *     有限次自动重试（间隔 5s），期间随时可手动重试/重新登录。
+ * refresh 成功但服务端仍识别失败时最多重试 3 次，超出转入手动重试，避免循环刷新。
+ */
+const MAX_AUTO_REFRESH = 3;
+// offline 态自动重试次数（间隔 5s，共 50s）：后端短暂抖动/重启场景无需用户手动干预
+const MAX_AUTO_RETRY = 10;
+const AUTO_RETRY_DELAY_MS = 5000;
+
+export default function AdminSessionRecover() {
+  const router = useRouter();
+  const [state, setState] = useState<"recovering" | "offline">("recovering");
+  const autoRefreshLeft = useRef(MAX_AUTO_REFRESH);
+  const autoRetryLeft = useRef(MAX_AUTO_RETRY);
+
+  const recover = useCallback(() => {
+    setState("recovering");
+    apiMe()
+      .then(async (res) => {
+        if (res.user) {
+          if (autoRefreshLeft.current > 0) {
+            autoRefreshLeft.current -= 1;
+            router.refresh();
+            return;
+          }
+          setState("offline");
+          return;
+        }
+        // apiMe 内部的续期复判以 sessionSeen 为门（本页从未识别出用户时为 false，
+        // 不会触发），这里显式补一轮 refresh：access 竞态/瞬断多数在此恢复
+        const back = encodeURIComponent(location.pathname + location.search);
+        if (hasAuthCookieHint()) {
+          const refreshed = await apiRefresh();
+          if (refreshed.ok) {
+            const again = await apiMe();
+            if (again.user) {
+              if (autoRefreshLeft.current > 0) {
+                autoRefreshLeft.current -= 1;
+                router.refresh();
+                return;
+              }
+              setState("offline");
+              return;
+            }
+            setState("offline");
+            return;
+          }
+          if (refreshed.transient) {
+            // 后端暂不可用：无法证明登录态失效，留在原地可手动重试
+            setState("offline");
+            return;
+          }
+          // refresh 明确失效（后端同时下发清 cookie）：会话确实终结，回跳登录
+          router.replace(`/login?redirect=${back}`);
+          return;
+        }
+        // 无任何凭据痕迹：直接回跳登录
+        router.replace(`/login?redirect=${back}`);
+      })
+      .catch(() => setState("offline"));
+  }, [router]);
+
+  useEffect(() => {
+    recover();
+  }, [recover]);
+
+  // offline 态有限次自动重试：后端短暂抖动/重启期间留在本页轮询恢复，
+  // 次数用尽后仅手动重试可再触发，避免无限轮询；手动重试会重置次数。
+  useEffect(() => {
+    if (state !== "offline") return;
+    if (autoRetryLeft.current <= 0) return;
+    autoRetryLeft.current -= 1;
+    const t = window.setTimeout(recover, AUTO_RETRY_DELAY_MS);
+    return () => window.clearTimeout(t);
+  }, [state, recover]);
+
+  const loginHref =
+    state === "offline" && typeof window !== "undefined"
+      ? `/login?redirect=${encodeURIComponent(location.pathname + location.search)}`
+      : "/login";
+
+  return (
+    <div className="max-w-md w-full panel p-8 text-center">
+      <span
+        className="inline-flex w-14 h-14 rounded-full items-center justify-center mb-4"
+        style={{ background: "var(--gold-soft)", color: "var(--gold)" }}
+      >
+        <ShieldAlert size={26} />
+      </span>
+      <h1 className="text-lg font-extrabold" style={{ color: "var(--ink)" }}>
+        正在恢复登录状态
+      </h1>
+      {state === "recovering" ? (
+        <p className="meta mt-2 text-[13px] inline-flex items-center justify-center gap-2">
+          <Loader2 size={14} className="animate-spin" aria-hidden />
+          正在确认会话，稍候将自动进入后台…
+        </p>
+      ) : (
+        <>
+          <p className="meta mt-2 text-[13px]">暂时无法确认登录状态，请稍后重试。</p>
+          <div className="flex items-center justify-center gap-3 mt-6">
+            <button
+              type="button"
+              onClick={() => {
+                autoRefreshLeft.current = MAX_AUTO_REFRESH;
+                autoRetryLeft.current = MAX_AUTO_RETRY;
+                recover();
+              }}
+              className="btn btn-primary inline-flex items-center gap-2"
+            >
+              <RefreshCw size={14} aria-hidden /> 重试
+            </button>
+            <Link href={loginHref} className="btn btn-line">
+              重新登录
+            </Link>
+          </div>
+        </>
+      )}
+      <p className="mt-4">
+        <Link href="/" className="meta text-[13px]">
+          返回首页
+        </Link>
+      </p>
+    </div>
+  );
+}

frontend/app/admin/ads/AdsAdmin.tsx

@@ -46,6 +46,7 @@ import Modal from "@/components/Modal";
 import { AdText } from "@/components/AdText";
 import { formatRelative } from "@/lib/format";
 import { toast } from "@/lib/toast";
+import { densitySrcSet, isOwnImage, pickVariantWidth, variantURL } from "@/lib/responsiveImage";
 
 type StatusFilter = "" | "pending" | "active" | "rejected" | "expired";
 type SectionId = "overview" | "queue" | "promote" | "sponsors";
@@ -882,8 +883,14 @@ function AdCard({
       {/* 预览缩略 */}
       <div className="j13-ads-thumb shrink-0" aria-hidden>
         {ad.kind === "image" && ad.image_url ? (
+          // 88×44 缩略位：本站图走 96/160 密度变体；外链图保持原地址
           // eslint-disable-next-line @next/next/no-img-element
-          <img src={ad.image_url} alt="" className="h-full w-full object-contain" />
+          <img
+            src={isOwnImage(ad.image_url) ? variantURL(ad.image_url, pickVariantWidth(88)) : ad.image_url}
+            srcSet={isOwnImage(ad.image_url) ? densitySrcSet(ad.image_url, 88) : undefined}
+            alt=""
+            className="h-full w-full object-contain"
+          />
         ) : ad.kind === "text" && ad.title ? (
           <div className="flex h-full w-full items-center justify-center p-1.5">
             <AdText title={ad.title} textColor={ad.text_color} bgColor={ad.bg_color} />
@@ -990,8 +997,14 @@ function PaymentEditor({
       {/* 二维码：点击即上传 */}
       <label className="j13-ads-qrbox shrink-0 cursor-pointer" title="点击上传/更换收款码">
         {payment.qr_url ? (
+          // 96×96 收款码位：本站图走 96/160 变体
           // eslint-disable-next-line @next/next/no-img-element
-          <img src={payment.qr_url} alt="" className="h-full w-full object-contain" />
+          <img
+            src={isOwnImage(payment.qr_url) ? variantURL(payment.qr_url, pickVariantWidth(96)) : payment.qr_url}
+            srcSet={isOwnImage(payment.qr_url) ? densitySrcSet(payment.qr_url, 96) : undefined}
+            alt=""
+            className="h-full w-full object-contain"
+          />
         ) : (
           <span className="flex flex-col items-center gap-1 text-[11px]" style={{ color: "var(--ink-3)" }}>
             <Upload size={16} />
@@ -1084,8 +1097,14 @@ function SponsorEditor({
       {/* Logo：点击即上传 */}
       <label className="j13-ads-logo shrink-0 cursor-pointer" title="点击上传/更换 Logo">
         {item.logo_url ? (
+          // 120×56 Logo 位：本站图走 160/256 变体
           // eslint-disable-next-line @next/next/no-img-element
-          <img src={item.logo_url} alt="" className="h-full w-full rounded-lg object-contain" />
+          <img
+            src={isOwnImage(item.logo_url) ? variantURL(item.logo_url, pickVariantWidth(120)) : item.logo_url}
+            srcSet={isOwnImage(item.logo_url) ? densitySrcSet(item.logo_url, 120) : undefined}
+            alt=""
+            className="h-full w-full rounded-lg object-contain"
+          />
         ) : (
           <span className="flex flex-col items-center gap-1 text-[11px]" style={{ color: "var(--ink-3)" }}>
             <Upload size={15} />

frontend/app/admin/ads/page.tsx

@@ -12,7 +12,7 @@ import {
   type SponsorsConfig,
 } from "@/lib/api";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../Forbidden";
 
 export const metadata: Metadata = {
@@ -22,7 +22,7 @@ export const metadata: Metadata = {
 export default async function AdminAdsPage() {
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.ADS)) {
     return <Forbidden text="推广与赞助管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/analytics/details/page.tsx

@@ -40,6 +40,34 @@ function kindBadge(kind: string) {
   );
 }
 
+/** 日期筛选：复用搜索框壳层样式，与工具条同高同视觉 */
+function DateField({
+  label,
+  value,
+  onChange,
+  ariaLabel,
+}: {
+  label: string;
+  value: string;
+  onChange: (v: string) => void;
+  ariaLabel: string;
+}) {
+  return (
+    <label className="admin-field-shell admin-search-shell w-full sm:w-44">
+      <span className="shrink-0 text-[12px]" style={{ color: "var(--ink-3)" }}>
+        {label}
+      </span>
+      <input
+        type="date"
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        className="admin-field-input"
+        aria-label={ariaLabel}
+      />
+    </label>
+  );
+}
+
 function DetailsInner() {
   const searchParams = useSearchParams();
   // 初始筛选只读一次（如从「爬虫与安全」跳转 ?ip=x.x.x.x）
@@ -86,6 +114,17 @@ function DetailsInner() {
 
   const resetPage = () => setPage(1);
 
+  const hasFilter = Boolean(kind || path || ip || bot || start || end);
+  const resetAll = () => {
+    setKind("");
+    setPath("");
+    setIp("");
+    setBot("");
+    setStart("");
+    setEnd("");
+    setPage(1);
+  };
+
   return (
     <div className="flex flex-col gap-4">
       <p className="meta text-[12.5px]">
@@ -106,48 +145,38 @@ function DetailsInner() {
                 ariaLabel="按路径筛选"
               />
             </div>
-            <div className="w-full sm:w-44">
+            <div className="w-full sm:w-48">
               <AdminSearchField
                 value={ip}
                 onChange={setIp}
                 onSubmit={resetPage}
                 onClear={() => { setIp(""); resetPage(); }}
-                placeholder="按 IP 筛选，回车应用"
+                placeholder="按 IP 精确筛选"
                 ariaLabel="按 IP 筛选"
               />
             </div>
-            <div className="w-full sm:w-40">
+            <div className="w-full sm:w-44">
               <AdminSearchField
                 value={bot}
                 onChange={setBot}
                 onSubmit={resetPage}
                 onClear={() => { setBot(""); resetPage(); }}
-                placeholder="按爬虫名筛选"
+                placeholder="按爬虫名精确筛选"
                 ariaLabel="按爬虫名筛选"
               />
             </div>
-            <label className="flex items-center gap-1.5 text-[12px]" style={{ color: "var(--ink-3)" }}>
-              从
-              <input
-                type="date"
-                value={start}
-                onChange={(e) => { setStart(e.target.value); resetPage(); }}
-                className="admin-field-input"
-                style={{ width: 150 }}
-                aria-label="开始日期"
-              />
-            </label>
-            <label className="flex items-center gap-1.5 text-[12px]" style={{ color: "var(--ink-3)" }}>
-              至
-              <input
-                type="date"
-                value={end}
-                onChange={(e) => { setEnd(e.target.value); resetPage(); }}
-                className="admin-field-input"
-                style={{ width: 150 }}
-                aria-label="结束日期"
-              />
-            </label>
+            <DateField label="从" value={start} onChange={(v) => { setStart(v); resetPage(); }} ariaLabel="开始日期" />
+            <DateField label="至" value={end} onChange={(v) => { setEnd(v); resetPage(); }} ariaLabel="结束日期" />
+            {hasFilter ? (
+              <button
+                type="button"
+                onClick={resetAll}
+                className="admin-field-shell admin-search-shell w-full sm:w-auto justify-center text-[13px] cursor-pointer transition-colors hover:bg-[var(--panel-2)]"
+                style={{ color: "var(--ink-2)" }}
+              >
+                重置筛选
+              </button>
+            ) : null}
           </div>
         </div>
 

frontend/app/admin/analytics/sources/page.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useState } from "react";
 import { AdminChartCard, NamedBarChart, NamedPieChart } from "@/components/admin/charts";
 import { apiStatsSources, type VisitSources } from "@/lib/api";
-import { RangeSegmented, StatsState, TableEmpty, refKindLabel } from "../ui";
+import { RangeSegmented, StatsState, TableEmpty, formatInt, refKindLabel } from "../ui";
 
 /** 来源按日表：固定展示四类主要来源列 */
 const TREND_KINDS = ["direct", "search", "social", "external"] as const;
@@ -49,11 +49,25 @@ export default function SourcesPage() {
       </AdminChartCard>
 
       <div className="grid gap-4 lg:grid-cols-2">
-        <AdminChartCard title="搜索引擎明细" hint="来自搜索结果页的浏览 Top 10">
-          {data.search_hosts.length ? (
-            <NamedBarChart data={data.search_hosts.map((h) => ({ label: h.key, count: h.count }))} />
+        <AdminChartCard title="站内搜索词 Top 10" hint="搜索结果页（/?q=）浏览量 Top 10">
+          {data.search_terms.length ? (
+            <ul className="flex flex-col divide-y max-h-[360px] overflow-y-auto" style={{ borderColor: "var(--line)" }}>
+              {data.search_terms.map((t, i) => (
+                <li key={`${i}-${t.key}`} className="py-2 flex items-center gap-3 text-[13px]">
+                  <span className="w-5 text-right tabular-nums shrink-0" style={{ color: "var(--ink-3)" }}>
+                    {i + 1}
+                  </span>
+                  <span className="flex-1 min-w-0 truncate" style={{ color: "var(--ink)" }} title={t.key}>
+                    {t.key}
+                  </span>
+                  <span className="tabular-nums shrink-0" style={{ color: "var(--ink-2)" }}>
+                    {formatInt(t.count)}
+                  </span>
+                </li>
+              ))}
+            </ul>
           ) : (
-            <TableEmpty text="暂无搜索引擎来源" />
+            <TableEmpty text="暂无站内搜索" />
           )}
         </AdminChartCard>
         <AdminChartCard title="外部链接明细" hint="其他站点跳转来源 Top 10">

frontend/app/admin/announcements/[id]/edit/page.tsx

@@ -3,7 +3,7 @@ import { Suspense } from "react";
 import { cookies } from "next/headers";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../../../Forbidden";
 import AnnouncementEditLoader from "./AnnouncementEditLoader";
 
@@ -19,7 +19,7 @@ export default async function AdminAnnouncementEditPage({ params }: PageProps) {
   const { id } = await params;
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.ANNOUNCEMENTS)) {
     return <Forbidden text="公告管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/announcements/new/page.tsx

@@ -3,7 +3,7 @@ import { Suspense } from "react";
 import { cookies } from "next/headers";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../../Forbidden";
 import AnnouncementComposeClient from "../AnnouncementComposeClient";
 
@@ -14,7 +14,7 @@ export const metadata: Metadata = {
 export default async function AdminAnnouncementNewPage() {
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.ANNOUNCEMENTS)) {
     return <Forbidden text="公告管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/announcements/page.tsx

@@ -5,18 +5,18 @@ import AnnouncementAdmin from "./AnnouncementAdmin";
 import { authCookieHeader } from "@/lib/cookies";
 import { fetchAdminAnnouncements, type Announcement } from "@/lib/api";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../Forbidden";
 
 export const metadata: Metadata = {
   title: "站点公告管理",
 };
 
-// 公告管理仅管理员及以上可用（板块管理员无公告权；后端路由另有守卫）
+// 公告管理：管理员及以上角色自带；超管/站长亦可授予任意账号
 export default async function AdminAnnouncementsPage() {
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.ANNOUNCEMENTS)) {
     return <Forbidden text="公告管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/appearance/BgMediaPicker.tsx

@@ -5,6 +5,7 @@ import { useEffect, useState } from "react";
 import Modal from "@/components/Modal";
 import { apiMyMedia, type MediaAttachment } from "@/lib/api";
 import { mediaURLFitsBackground, type BgSurface } from "@/lib/bg";
+import { isOwnImage, variantURL, widthSrcSet } from "@/lib/responsiveImage";
 
 const SURFACE_LABEL: Record<BgSurface, string> = {
   site: "前台背景",
@@ -101,7 +102,9 @@ export default function BgMediaPicker({
             >
               {/* eslint-disable-next-line @next/next/no-img-element */}
               <img
-                src={item.url}
+                src={isOwnImage(item.url) ? variantURL(item.url, 160) : item.url}
+                srcSet={isOwnImage(item.url) ? widthSrcSet(item.url, [96, 160, 256, 384]) : undefined}
+                sizes="(max-width:520px) 23vw, 96px"
                 alt={`${SURFACE_LABEL[surface]}候选图`}
                 className="w-full h-full object-cover"
                 loading="lazy"

frontend/app/admin/content/ContentAdmin.tsx

@@ -42,7 +42,7 @@ import {
 } from "@/lib/api";
 import { canModerateAuthor } from "@/lib/roles";
 import { formatRelative } from "@/lib/format";
-import { postPath } from "@/lib/urlStyle";
+import { postPath, commentAnchor } from "@/lib/urlStyle";
 import { toast } from "@/lib/toast";
 import { realtime, RT_MODERATION_CHANGED } from "@/lib/realtime";
 import Avatar from "@/components/Avatar";
@@ -692,7 +692,7 @@ export default function ContentAdmin({
                     c.post_title
                   ) : (
                     <Link
-                      href={`${postPath(urlStyle, c.post_id)}#comment-${c.id}`}
+                      href={`${postPath(urlStyle, c.post_id)}${commentAnchor(c.floor, c.is_root, c.id)}`}
                       className="hover:underline"
                       style={{ color: "var(--accent)" }}
                     >

frontend/app/admin/friend-links/FriendLinksAdmin.tsx

@@ -0,0 +1,496 @@
+"use client";
+
+import { useMemo, useState } from "react";
+import {
+  Check,
+  Link2,
+  Loader2,
+  Pencil,
+  Plus,
+  RotateCcw,
+  Trash2,
+  X,
+} from "lucide-react";
+import {
+  apiAdminCreateFriendLink,
+  apiAdminDeleteFriendLink,
+  apiAdminListFriendLinks,
+  apiAdminSetFriendLinkStatus,
+  apiAdminUpdateFriendLink,
+  type FriendLink,
+  type FriendLinkAdminInput,
+  type FriendLinkStatus,
+} from "@/lib/api";
+import { AdminPageHeader, AdminSettingsPage, AdminEmpty } from "@/components/admin";
+import { densitySrcSet, isOwnImage, pickVariantWidth, variantURL } from "@/lib/responsiveImage";
+
+interface Props {
+  initialLinks: FriendLink[];
+  initError: string;
+}
+
+const FIELD_CLASS = "w-full rounded-lg px-3 py-2 text-[14px] outline-none transition-colors";
+const FIELD_STYLE = {
+  background: "var(--panel-2)",
+  color: "var(--ink)",
+  border: "1px solid var(--line)",
+};
+
+const TABS: { key: FriendLinkStatus; label: string }[] = [
+  { key: "pending", label: "待审批" },
+  { key: "approved", label: "已通过" },
+  { key: "rejected", label: "已拒绝" },
+];
+
+interface FormState {
+  name: string;
+  url: string;
+  description: string;
+  logo_url: string;
+  category: string;
+  reciprocal_url: string;
+  sort_order: number;
+}
+
+const EMPTY_FORM: FormState = {
+  name: "",
+  url: "",
+  description: "",
+  logo_url: "",
+  category: "",
+  reciprocal_url: "",
+  sort_order: 0,
+};
+
+export default function FriendLinksAdmin({ initialLinks, initError }: Props) {
+  const [links, setLinks] = useState<FriendLink[]>(initialLinks);
+  const [tab, setTab] = useState<FriendLinkStatus>("pending");
+  const [editorOpen, setEditorOpen] = useState(false);
+  const [editingId, setEditingId] = useState<number | null>(null);
+  const [form, setForm] = useState<FormState>(EMPTY_FORM);
+  const [saving, setSaving] = useState(false);
+  const [busyId, setBusyId] = useState<number | null>(null);
+  const [error, setError] = useState(initError);
+
+  const counts = useMemo(() => {
+    const c = { pending: 0, approved: 0, rejected: 0 } as Record<FriendLinkStatus, number>;
+    for (const l of links) c[l.status] = (c[l.status] || 0) + 1;
+    return c;
+  }, [links]);
+
+  const filtered = useMemo(
+    () => links.filter((l) => l.status === tab).sort((a, b) => a.sort_order - b.sort_order || a.id - b.id),
+    [links, tab]
+  );
+
+  const refresh = async () => {
+    try {
+      const res = await apiAdminListFriendLinks();
+      setLinks(res.links ?? []);
+      setError("");
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "加载失败");
+    }
+  };
+
+  const openCreate = () => {
+    setEditingId(null);
+    setForm(EMPTY_FORM);
+    setEditorOpen(true);
+  };
+
+  const openEdit = (l: FriendLink) => {
+    setEditingId(l.id);
+    setForm({
+      name: l.name,
+      url: l.url,
+      description: l.description || "",
+      logo_url: l.logo_url || "",
+      category: l.category || "",
+      reciprocal_url: l.reciprocal_url || "",
+      sort_order: l.sort_order,
+    });
+    setEditorOpen(true);
+  };
+
+  const closeEditor = () => {
+    setEditorOpen(false);
+    setEditingId(null);
+    setForm(EMPTY_FORM);
+  };
+
+  const set = (k: keyof FormState, v: string | number) =>
+    setForm((f) => ({ ...f, [k]: v }));
+
+  const submit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    if (saving) return;
+    setSaving(true);
+    setError("");
+    try {
+      const body: FriendLinkAdminInput = {
+        name: form.name.trim(),
+        url: form.url.trim(),
+        description: form.description.trim() || undefined,
+        logo_url: form.logo_url.trim() || undefined,
+        category: form.category.trim() || undefined,
+        reciprocal_url: form.reciprocal_url.trim() || undefined,
+        sort_order: form.sort_order,
+      };
+      if (editingId == null) {
+        await apiAdminCreateFriendLink(body);
+      } else {
+        await apiAdminUpdateFriendLink(editingId, body);
+      }
+      closeEditor();
+      await refresh();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "保存失败");
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const setStatus = async (id: number, status: FriendLinkStatus) => {
+    let rejectReason = "";
+    if (status === "rejected") {
+      const r = window.prompt("请输入拒绝理由（可选）", "");
+      if (r === null) return;
+      rejectReason = r;
+    }
+    setBusyId(id);
+    setError("");
+    try {
+      await apiAdminSetFriendLinkStatus(id, status, rejectReason || undefined);
+      await refresh();
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "操作失败");
+    } finally {
+      setBusyId(null);
+    }
+  };
+
+  const remove = async (id: number) => {
+    if (!window.confirm("确定删除该友情链接？此操作不可撤销。")) return;
+    setBusyId(id);
+    setError("");
+    try {
+      await apiAdminDeleteFriendLink(id);
+      await refresh();
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "删除失败");
+    } finally {
+      setBusyId(null);
+    }
+  };
+
+  return (
+    <AdminSettingsPage>
+      <AdminPageHeader
+        icon={Link2}
+        title="友情链接管理"
+        description="审批用户申请的友情链接，或直接新建/编辑已收录条目"
+        actions={
+          <button type="button" className="btn btn-primary btn-sm" onClick={openCreate}>
+            <Plus size={14} /> 新建
+          </button>
+        }
+      />
+
+      {error ? <p className="alert-error mb-4">{error}</p> : null}
+
+      <div className="panel overflow-hidden">
+        <div className="flex items-center gap-1 px-4 pt-3 border-b" style={{ borderColor: "var(--line)" }}>
+          {TABS.map((t) => {
+            const active = tab === t.key;
+            const n = counts[t.key] || 0;
+            return (
+              <button
+                key={t.key}
+                type="button"
+                onClick={() => setTab(t.key)}
+                className="px-3 py-2 text-[13.5px] font-medium transition-colors"
+                style={{
+                  color: active ? "var(--accent)" : "var(--ink-3)",
+                  borderBottom: active ? "2px solid var(--accent)" : "2px solid transparent",
+                  marginBottom: "-1px",
+                }}
+              >
+                {t.label}
+                <span className="ml-1.5 text-[11.5px] opacity-70">{n}</span>
+              </button>
+            );
+          })}
+        </div>
+
+        {filtered.length === 0 ? (
+          <AdminEmpty
+            icon={<Link2 size={20} />}
+            title={tab === "pending" ? "暂无待审批申请" : tab === "approved" ? "暂无已收录友链" : "暂无被拒绝的申请"}
+            description={tab === "pending" ? "用户提交的申请会出现在这里" : undefined}
+          />
+        ) : (
+          <ul>
+            {filtered.map((l) => (
+              <li
+                key={l.id}
+                className="px-5 py-4 flex items-start gap-3"
+                style={{ borderTop: "1px solid var(--line)" }}
+              >
+                {l.logo_url ? (
+                  // 36px 位：本站图走 48/96 变体；外链保持原样
+                  // eslint-disable-next-line @next/next/no-img-element
+                  <img
+                    src={isOwnImage(l.logo_url) ? variantURL(l.logo_url, pickVariantWidth(36)) : l.logo_url}
+                    srcSet={isOwnImage(l.logo_url) ? densitySrcSet(l.logo_url, 36) : undefined}
+                    alt=""
+                    width={36}
+                    height={36}
+                    className="rounded-lg object-contain shrink-0"
+                    style={{ width: 36, height: 36, background: "var(--panel-2)" }}
+                  />
+                ) : (
+                  <span
+                    className="w-9 h-9 rounded-lg flex items-center justify-center shrink-0"
+                    style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
+                    aria-hidden
+                  >
+                    <Link2 size={16} />
+                  </span>
+                )}
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2 flex-wrap">
+                    <a
+                      href={l.url}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      className="font-semibold text-[14.5px] hover:text-[var(--accent)]"
+                      style={{ color: "var(--ink)" }}
+                    >
+                      {l.name}
+                    </a>
+                    {l.category ? (
+                      <span
+                        className="inline-flex items-center rounded-full px-2 py-0.5 text-[11px]"
+                        style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
+                      >
+                        {l.category}
+                      </span>
+                    ) : null}
+                    <span className="meta text-[11.5px]">#{l.id} · 顺序 {l.sort_order}</span>
+                  </div>
+                  {l.description ? (
+                    <p className="meta mt-1 text-[12.5px] line-clamp-2">{l.description}</p>
+                  ) : null}
+                  {l.reciprocal_url ? (
+                    <p className="meta mt-1 text-[11.5px]">
+                      回链：
+                      <a href={l.reciprocal_url} target="_blank" rel="noopener noreferrer" className="underline hover:text-[var(--accent)]">
+                        {l.reciprocal_url}
+                      </a>
+                    </p>
+                  ) : null}
+                  {l.status === "rejected" && l.reject_reason ? (
+                    <p className="mt-1 text-[12px]" style={{ color: "var(--danger)" }}>拒绝理由：{l.reject_reason}</p>
+                  ) : null}
+                </div>
+                <div className="flex items-center gap-1.5 shrink-0">
+                  {busyId === l.id ? (
+                    <Loader2 size={15} className="animate-spin" style={{ color: "var(--ink-3)" }} />
+                  ) : null}
+                  {l.status === "pending" ? (
+                    <>
+                      <button
+                        type="button"
+                        className="btn btn-primary btn-sm"
+                        onClick={() => setStatus(l.id, "approved")}
+                        disabled={busyId === l.id}
+                        title="通过"
+                      >
+                        <Check size={13} /> 通过
+                      </button>
+                      <button
+                        type="button"
+                        className="btn btn-line btn-sm"
+                        onClick={() => setStatus(l.id, "rejected")}
+                        disabled={busyId === l.id}
+                        title="拒绝"
+                      >
+                        <X size={13} /> 拒绝
+                      </button>
+                    </>
+                  ) : null}
+                  {l.status === "rejected" ? (
+                    <button
+                      type="button"
+                      className="btn btn-line btn-sm"
+                      onClick={() => setStatus(l.id, "approved")}
+                      disabled={busyId === l.id}
+                      title="重新通过"
+                    >
+                      <RotateCcw size={13} /> 恢复
+                    </button>
+                  ) : null}
+                  {l.status === "approved" ? (
+                    <>
+                      <button
+                        type="button"
+                        className="btn btn-line btn-sm"
+                        onClick={() => openEdit(l)}
+                        disabled={busyId === l.id}
+                        title="编辑"
+                      >
+                        <Pencil size={13} /> 编辑
+                      </button>
+                      <button
+                        type="button"
+                        className="btn btn-line btn-sm"
+                        onClick={() => setStatus(l.id, "pending")}
+                        disabled={busyId === l.id}
+                        title="下线"
+                      >
+                        下线
+                      </button>
+                    </>
+                  ) : null}
+                  {l.status === "pending" ? (
+                    <button
+                      type="button"
+                      className="btn btn-line btn-sm"
+                      onClick={() => openEdit(l)}
+                      disabled={busyId === l.id}
+                      title="编辑"
+                    >
+                      <Pencil size={13} />
+                    </button>
+                  ) : null}
+                  <button
+                    type="button"
+                    className="btn btn-line btn-sm"
+                    onClick={() => remove(l.id)}
+                    disabled={busyId === l.id}
+                    title="删除"
+                    style={{ color: "var(--danger)" }}
+                  >
+                    <Trash2 size={13} />
+                  </button>
+                </div>
+              </li>
+            ))}
+          </ul>
+        )}
+      </div>
+
+      {editorOpen ? (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center p-4"
+          style={{ background: "rgba(0,0,0,0.5)" }}
+          onClick={closeEditor}
+        >
+          <div
+            className="panel w-full max-w-lg p-5 sm:p-6 max-h-[90vh] overflow-y-auto"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <h2 className="text-[17px] font-bold mb-4" style={{ color: "var(--ink)" }}>
+              {editingId == null ? "新建友情链接" : "编辑友情链接"}
+            </h2>
+            <form onSubmit={submit} className="space-y-3">
+              <div className="grid gap-3 sm:grid-cols-2">
+                <label className="block">
+                  <span className="meta block mb-1">名称 *</span>
+                  <input
+                    required
+                    maxLength={64}
+                    value={form.name}
+                    onChange={(e) => set("name", e.target.value)}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+                <label className="block">
+                  <span className="meta block mb-1">地址 *</span>
+                  <input
+                    required
+                    type="url"
+                    maxLength={512}
+                    value={form.url}
+                    onChange={(e) => set("url", e.target.value)}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+              </div>
+              <label className="block">
+                <span className="meta block mb-1">简介</span>
+                <input
+                  maxLength={255}
+                  value={form.description}
+                  onChange={(e) => set("description", e.target.value)}
+                  className={FIELD_CLASS}
+                  style={FIELD_STYLE}
+                />
+              </label>
+              <div className="grid gap-3 sm:grid-cols-2">
+                <label className="block">
+                  <span className="meta block mb-1">Logo URL</span>
+                  <input
+                    type="url"
+                    maxLength={512}
+                    value={form.logo_url}
+                    onChange={(e) => set("logo_url", e.target.value)}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+                <label className="block">
+                  <span className="meta block mb-1">分类</span>
+                  <input
+                    maxLength={32}
+                    value={form.category}
+                    onChange={(e) => set("category", e.target.value)}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+              </div>
+              <div className="grid gap-3 sm:grid-cols-2">
+                <label className="block">
+                  <span className="meta block mb-1">回链地址</span>
+                  <input
+                    type="url"
+                    maxLength={512}
+                    value={form.reciprocal_url}
+                    onChange={(e) => set("reciprocal_url", e.target.value)}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+                <label className="block">
+                  <span className="meta block mb-1">顺序</span>
+                  <input
+                    type="number"
+                    min={0}
+                    value={form.sort_order}
+                    onChange={(e) => set("sort_order", Number(e.target.value))}
+                    className={FIELD_CLASS}
+                    style={FIELD_STYLE}
+                  />
+                </label>
+              </div>
+
+              <div className="flex items-center justify-end gap-2 pt-2">
+                <button type="button" className="btn btn-line btn-sm" onClick={closeEditor} disabled={saving}>
+                  取消
+                </button>
+                <button type="submit" className="btn btn-primary btn-sm" disabled={saving}>
+                  {saving ? <Loader2 size={13} className="animate-spin" /> : null}
+                  {saving ? "保存中…" : "保存"}
+                </button>
+              </div>
+            </form>
+          </div>
+        </div>
+      ) : null}
+    </AdminSettingsPage>
+  );
+}

frontend/app/admin/friend-links/page.tsx

@@ -0,0 +1,36 @@
+import type { Metadata } from "next";
+import { Suspense } from "react";
+import { cookies } from "next/headers";
+import FriendLinksAdmin from "./FriendLinksAdmin";
+import { authCookieHeader } from "@/lib/cookies";
+import { fetchAdminFriendLinks, type FriendLink } from "@/lib/api";
+import { getMeCached } from "@/lib/serverData";
+import { isSuperOrOwner } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+
+export const metadata: Metadata = {
+  title: "友情链接管理",
+};
+
+export default async function AdminFriendLinksPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !isSuperOrOwner(me.user.role)) {
+    return <Forbidden text="友情链接管理仅超级管理员及以上角色可操作。" />;
+  }
+
+  let links: FriendLink[] = [];
+  let initError = "";
+  try {
+    const res = await fetchAdminFriendLinks(cookie || undefined);
+    links = res.links ?? [];
+  } catch (e) {
+    initError = e instanceof Error ? e.message : "加载失败";
+  }
+
+  return (
+    <Suspense fallback={<p className="meta px-1 py-6">加载中…</p>}>
+      <FriendLinksAdmin initialLinks={links} initError={initError} />
+    </Suspense>
+  );
+}

frontend/app/admin/layout.tsx

@@ -1,11 +1,13 @@
 import type { Metadata } from "next";
 import Link from "next/link";
-import { cookies } from "next/headers";
+import { cookies, headers } from "next/headers";
+import { redirect } from "next/navigation";
 import { ShieldAlert } from "lucide-react";
-import { authCookieHeader, TOKEN_COOKIE } from "@/lib/cookies";
+import { authCookieHeader, REFRESH_COOKIE, CSRF_COOKIE, TOKEN_COOKIE } from "@/lib/cookies";
 import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
-import { canAccessAdminMessages, isStaff } from "@/lib/roles";
+import { canAccessAdminMessages, hasAnyChannelPerm, isStaff } from "@/lib/roles";
 import AdminShell from "@/components/admin/AdminShell";
+import AdminSessionRecover from "./AdminSessionRecover";
 
 // 整个 /admin 树不进入索引（子页面无需重复声明）
 export const metadata: Metadata = {
@@ -13,7 +15,7 @@ export const metadata: Metadata = {
 };
 
 // 权限以 Go 端为唯一判定；此处仅决定管理界面是否直出。
-// 允许：管理角色，或仅有消息管理/群管权限的用户（仅消息菜单可见）。
+// 允许：管理角色 / 消息管理/群管权限 / 任一渠道权限（公告/单页/书库/广告）。
 export default async function AdminLayout({ children }: { children: React.ReactNode }) {
   const cookieStore = await cookies();
   const cookie = authCookieHeader(cookieStore);
@@ -22,9 +24,52 @@ export default async function AdminLayout({ children }: { children: React.ReactN
   const theme = cookieStore.get("j13-theme")?.value === "dark" ? "dark" : "light";
 
   const allowed =
-    !!me.user && (isStaff(me.user.role) || canAccessAdminMessages(me.user));
+    !!me.user &&
+    (isStaff(me.user.role) || canAccessAdminMessages(me.user) || hasAnyChannelPerm(me.user));
 
   if (!allowed || !me.user) {
+    // 已登录但无后台权限：保留提示卡片
+    if (me.user) {
+      return (
+        <div
+          data-admin-viewport
+          id="main"
+          tabIndex={-1}
+          className="min-h-screen flex items-center justify-center px-4 outline-none"
+        >
+          <div className="max-w-md w-full panel p-8 text-center">
+            <span
+              className="inline-flex w-14 h-14 rounded-full items-center justify-center mb-4"
+              style={{ background: "var(--gold-soft)", color: "var(--gold)" }}
+            >
+              <ShieldAlert size={26} />
+            </span>
+            <h1 className="text-lg font-extrabold" style={{ color: "var(--ink)" }}>
+              需要管理员权限
+            </h1>
+            <p className="meta mt-2 text-[13px]">此区域仅供站点管理员访问，如有疑问请联系站长。</p>
+            <Link href="/" className="btn btn-primary mt-6">
+              返回首页
+            </Link>
+          </div>
+        </div>
+      );
+    }
+
+    // SSR 侧未识别出用户（/api/me 瞬断、access 过期轮转竞态等）时，原实现直接
+    // 落到无壳的权限卡片——手机端表现为「首次进入后台整块导航 header 消失」，
+    // 无法切换管理板块，再进一次才恢复。这里按凭据状态分流入修复：
+    // ① 完全无凭据：直达登录页并回跳目标地址，不再给无导航的死胡同卡片；
+    // ② 仍带凭据：客户端经 fetchWithRefresh 自动续期后 router.refresh 自愈。
+    const hasAuthHint = !!(
+      cookieStore.get(TOKEN_COOKIE)?.value ||
+      cookieStore.get(REFRESH_COOKIE)?.value ||
+      cookieStore.get(CSRF_COOKIE)?.value
+    );
+    if (!hasAuthHint) {
+      const pathname = (await headers()).get("x-pathname") || "/admin";
+      redirect(`/login?redirect=${encodeURIComponent(pathname)}`);
+    }
     return (
       <div
         data-admin-viewport
@@ -32,21 +77,7 @@ export default async function AdminLayout({ children }: { children: React.ReactN
         tabIndex={-1}
         className="min-h-screen flex items-center justify-center px-4 outline-none"
       >
-        <div className="max-w-md w-full panel p-8 text-center">
-          <span
-            className="inline-flex w-14 h-14 rounded-full items-center justify-center mb-4"
-            style={{ background: "var(--gold-soft)", color: "var(--gold)" }}
-          >
-            <ShieldAlert size={26} />
-          </span>
-          <h1 className="text-lg font-extrabold" style={{ color: "var(--ink)" }}>
-            需要管理员权限
-          </h1>
-          <p className="meta mt-2 text-[13px]">此区域仅供站点管理员访问，如有疑问请联系站长。</p>
-          <Link href="/" className="btn btn-primary mt-6">
-            返回首页
-          </Link>
-        </div>
+        <AdminSessionRecover />
       </div>
     );
   }

frontend/app/admin/library/ImportMdDialog.tsx

@@ -0,0 +1,431 @@
+"use client";
+
+import { useMemo, useRef, useState } from "react";
+import { FileText, Loader2, Upload, X } from "lucide-react";
+import Modal from "@/components/Modal";
+import { toast } from "@/lib/toast";
+import type { LibraryImportMdInput, LibrarySectionItem } from "@/lib/api";
+import { parseEpub } from "./parseEpub";
+
+const MAX_IMPORT_BYTES = 5 * 1024 * 1024; // 与后端 MaxImportBytes 一致（单文件）
+const MAX_TOTAL_BYTES = 20 * 1024 * 1024; // 与后端 MaxImportTotalBytes 一致
+const MAX_FILES = 50; // 与后端 MaxImportFiles 一致
+const MAX_EPUB_BYTES = 50 * 1024 * 1024; // epub 原始文件上限（二进制，图片占大头，转出文本通常很小）
+const MAX_CHAPTER_CHARS = 100_000; // 与后端 MaxSectionContent 一致（epub 每目录项即一章）
+
+type SplitLevel = "h1" | "h2" | "none";
+
+const SPLIT_OPTIONS: { value: SplitLevel; label: string; hint: string }[] = [
+  { value: "h1", label: "按一级标题（#）", hint: "每个 # 标题拆为一章" },
+  { value: "h2", label: "按二级标题（##）", hint: "每个 ## 标题拆为一章" },
+  { value: "none", label: "不拆分", hint: "每个文件整篇一章" },
+];
+
+interface PendingFile {
+  name: string;
+  text: string;
+}
+
+/** 与后端 splitMarkdownChapters 逻辑一致：跳过代码围栏，按所选级别标题取章标题列表 */
+function splitPreview(content: string, level: SplitLevel): string[] {
+  if (level === "none") return [];
+  const prefix = level === "h2" ? "## " : "# ";
+  const titles: string[] = [];
+  let inCode = false;
+  let count = 0;
+  for (const raw of content.replace(/\r\n/g, "\n").replace(/\r/g, "\n").split("\n")) {
+    const t = raw.trim();
+    if (t.startsWith("```")) inCode = !inCode;
+    if (!inCode && t.startsWith(prefix) && t.length > prefix.length) {
+      const title = t.slice(prefix.length).replace(/#+\s*$/, "").trim();
+      titles.push(title || `第 ${++count} 章`);
+    }
+  }
+  return titles;
+}
+
+/** 单个文件预计拆出的章数（未命中标题回退 1 章，标题取文件名） */
+function splitCount(text: string, level: SplitLevel): number {
+  if (level === "none") return 1;
+  const n = splitPreview(text, level).length;
+  return n > 0 ? n : 1;
+}
+
+export default function ImportMdDialog({
+  onImport,
+  onClose,
+}: {
+  /** 执行导入，返回新建章节（父组件负责刷新与选中第一章）；失败时抛错 */
+  onImport: (input: LibraryImportMdInput) => Promise<LibrarySectionItem[]>;
+  /** 关闭弹窗；导入成功时带出新建章节，父组件据此选中第一章 */
+  onClose: (created?: LibrarySectionItem[]) => void;
+}) {
+  const fileInputRef = useRef<HTMLInputElement>(null);
+  const [files, setFiles] = useState<PendingFile[]>([]);
+  const [pasted, setPasted] = useState("");
+  const [splitLevel, setSplitLevel] = useState<SplitLevel>("h2");
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState("");
+  // epub 模式：列表已被 epub 解析结果整体替换，按目录顺序每项一章（不参与拆分）
+  const [fromEpub, setFromEpub] = useState(false);
+  const [epubBusy, setEpubBusy] = useState(false);
+
+  // 已选文件优先；未选文件时用粘贴内容（视为一个伪文件）
+  const sourceFiles = useMemo<PendingFile[]>(
+    () =>
+      files.length > 0
+        ? files
+        : pasted.trim()
+          ? [{ name: "未命名导入.md", text: pasted }]
+          : [],
+    [files, pasted]
+  );
+
+  const perFileCounts = useMemo(
+    () => sourceFiles.map((f) => ({ name: f.name, count: splitCount(f.text, splitLevel) })),
+    [sourceFiles, splitLevel]
+  );
+  const totalChapters = perFileCounts.reduce((n, f) => n + f.count, 0);
+  const single = sourceFiles.length === 1 ? sourceFiles[0] : null;
+  const singleTitles = useMemo(
+    () => (single && splitLevel !== "none" ? splitPreview(single.text, splitLevel) : []),
+    [single, splitLevel]
+  );
+  const willFallback =
+    single != null && splitLevel !== "none" && singleTitles.length === 0 && single.text.trim().length > 0;
+
+  const oversizeFile = sourceFiles.find((f) => f.text.length > MAX_IMPORT_BYTES);
+  const overFiles = sourceFiles.length > MAX_FILES;
+  const overTotal = sourceFiles.reduce((n, f) => n + f.text.length, 0) > MAX_TOTAL_BYTES;
+  // epub 每个目录项即一章，无法再拆；超限章直接阻止导入（与后端校验一致）
+  const oversizeChapters = fromEpub
+    ? sourceFiles.filter((f) => f.text.length > MAX_CHAPTER_CHARS)
+    : [];
+
+  async function pickFiles(list: FileList | null) {
+    if (!list || list.length === 0) return;
+    setError("");
+    const msgs: string[] = [];
+    const fileList = Array.from(list);
+    const epubFiles = fileList.filter((f) => f.name.toLowerCase().endsWith(".epub"));
+    const mdFiles = fileList.filter((f) => !f.name.toLowerCase().endsWith(".epub"));
+
+    // epub：解析为章节伪文件并整体替换（同一批次不与 md 混选）
+    if (epubFiles.length > 0) {
+      setEpubBusy(true);
+      try {
+        const chapters: PendingFile[] = [];
+        for (const f of epubFiles) {
+          if (f.size > MAX_EPUB_BYTES) {
+            msgs.push(`超过 50MB 已跳过：${f.name}`);
+            continue;
+          }
+          const parsed = await parseEpub(f);
+          for (const c of parsed) {
+            chapters.push({
+              name: `${String(chapters.length + 1).padStart(3, "0")}-${c.title || "未命名"}.md`,
+              text: c.markdown,
+            });
+          }
+        }
+        if (chapters.length > 0) {
+          if (chapters.length > MAX_FILES) {
+            msgs.push(`epub 解析出 ${chapters.length} 章，超过单次上限，已截取前 ${MAX_FILES} 章`);
+          }
+          setFiles(chapters.slice(0, MAX_FILES));
+          setSplitLevel("none");
+          setFromEpub(true);
+        } else if (!msgs.length) {
+          msgs.push("未能从 epub 中解析出章节");
+        }
+      } catch (e) {
+        msgs.push(e instanceof Error ? e.message : "epub 解析失败");
+      } finally {
+        setEpubBusy(false);
+      }
+    } else {
+      // md/txt：沿用原合并逻辑；当前若是 epub 章节列表则先清空
+      const picked: PendingFile[] = [];
+      const tooBig: string[] = [];
+      const failed: string[] = [];
+      for (const f of mdFiles) {
+        if (f.size > MAX_IMPORT_BYTES) {
+          tooBig.push(f.name);
+          continue;
+        }
+        try {
+          picked.push({ name: f.name, text: await f.text() });
+        } catch {
+          failed.push(f.name);
+        }
+      }
+      let truncated = false;
+      setFiles((prev) => {
+        const merged = [...(fromEpub ? [] : prev), ...picked];
+        // 文件名自然排序，保证 01、02…23 顺序
+        merged.sort((a, b) => a.name.localeCompare(b.name, "zh-Hans-CN", { numeric: true }));
+        truncated = merged.length > MAX_FILES;
+        return merged.slice(0, MAX_FILES);
+      });
+      if (fromEpub && picked.length > 0) {
+        setFromEpub(false);
+        msgs.push("已清空 epub 章节，改用所选 Markdown 文件");
+      }
+      if (tooBig.length) msgs.push(`超过 5MB 已跳过：${tooBig.join("、")}`);
+      if (failed.length) msgs.push(`无法读取：${failed.join("、")}`);
+      if (truncated) msgs.push(`单次最多 ${MAX_FILES} 个文件，已截取前 ${MAX_FILES} 个`);
+    }
+
+    if (msgs.length) setError(msgs.join("；"));
+    if (fileInputRef.current) fileInputRef.current.value = "";
+  }
+
+  function removeAt(idx: number) {
+    setFiles((prev) => prev.filter((_, i) => i !== idx));
+  }
+
+  async function submit() {
+    if (sourceFiles.length === 0) {
+      setError("请先选择文件或粘贴 Markdown 内容");
+      return;
+    }
+    if (oversizeFile) {
+      setError(`单个文件不能超过 5MB：${oversizeFile.name}`);
+      return;
+    }
+    if (overFiles) {
+      setError(`单次最多导入 ${MAX_FILES} 个文件`);
+      return;
+    }
+    if (overTotal) {
+      setError("内容总量过大：不能超过 20MB");
+      return;
+    }
+    if (oversizeChapters.length > 0) {
+      setError(
+        `以下章节正文超过 100000 字，请先拆分后再导入：${oversizeChapters.map((f) => f.name).join("、")}`
+      );
+      return;
+    }
+    setBusy(true);
+    setError("");
+    try {
+      const created = await onImport({
+        files: sourceFiles.map((f) => ({ filename: f.name, content: f.text })),
+        split_level: splitLevel,
+      });
+      toast(
+        sourceFiles.length > 1
+          ? `已导入 ${sourceFiles.length} 个文件共 ${created.length} 章`
+          : `已导入 ${created.length} 章`,
+        "ok"
+      );
+      onClose(created);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "导入失败");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  const blocked = Boolean(oversizeFile || overFiles || overTotal || oversizeChapters.length > 0);
+
+  return (
+    <Modal
+      open
+      title="导入章节"
+      description="Markdown 按所选方式拆章；epub 按目录顺序导入，每个目录项一章"
+      onClose={onClose}
+      busy={busy}
+      maxWidthClass="max-w-xl"
+      bodyClassName="max-h-[60vh] overflow-y-auto j13-rail-scroll"
+      footer={
+        <>
+          <button type="button" className="btn btn-line" onClick={() => onClose()} disabled={busy}>
+            取消
+          </button>
+          <button
+            type="button"
+            className="btn btn-primary"
+            disabled={busy || epubBusy || sourceFiles.length === 0 || blocked}
+            onClick={() => void submit()}
+            aria-busy={busy || epubBusy || undefined}
+          >
+            {busy || epubBusy ? (
+              <Loader2 size={14} className="animate-spin" aria-hidden />
+            ) : (
+              <Upload size={14} aria-hidden />
+            )}
+            {busy || epubBusy ? (epubBusy ? "解析中…" : "导入中…") : "导入"}
+          </button>
+        </>
+      }
+    >
+      <div className="flex flex-col gap-4">
+        <div>
+          <p className="admin-doc-label">
+            来源
+            {sourceFiles.length > 1 ? `（${sourceFiles.length} 个文件，按文件名顺序导入）` : ""}
+          </p>
+          <div className="flex items-center gap-2">
+            <button
+              type="button"
+              className="btn btn-line btn-sm"
+              disabled={busy || epubBusy}
+              onClick={() => fileInputRef.current?.click()}
+            >
+              <FileText size={13} aria-hidden /> 选择 .md / .txt / .epub 文件（可多选）
+            </button>
+            {files.length > 0 ? (
+              <button
+                type="button"
+                className="admin-doc-textbtn"
+                disabled={busy || epubBusy}
+                onClick={() => {
+                  setFiles([]);
+                  setFromEpub(false);
+                }}
+              >
+                清空
+              </button>
+            ) : null}
+          </div>
+          <input
+            ref={fileInputRef}
+            type="file"
+            multiple
+            accept=".md,.markdown,.txt,.epub,text/markdown,text/plain,application/epub+zip"
+            className="sr-only"
+            onChange={(e) => void pickFiles(e.target.files)}
+          />
+        </div>
+
+        {files.length > 0 ? (
+          <ul
+            className="rounded-xl max-h-48 overflow-y-auto j13-rail-scroll"
+            style={{ border: "1px solid var(--line)", background: "var(--panel-2)" }}
+          >
+            {files.map((f, i) => (
+              <li
+                key={`${f.name}-${i}`}
+                className="flex items-center gap-2 px-3 py-1.5"
+                style={{ borderBottom: i < files.length - 1 ? "1px solid var(--line)" : undefined }}
+              >
+                <span className="text-[12.5px] truncate min-w-0 flex-1" style={{ color: "var(--ink)" }}>
+                  {f.name}
+                </span>
+                <span className="meta text-[11px] shrink-0 tabular-nums">{f.text.length} 字符</span>
+                <button
+                  type="button"
+                  className="w-5 h-5 shrink-0 rounded-md flex items-center justify-center hover:bg-[var(--panel)] transition-colors"
+                  style={{ color: "var(--ink-3)" }}
+                  aria-label={`移除 ${f.name}`}
+                  disabled={busy}
+                  onClick={() => removeAt(i)}
+                >
+                  <X size={12} aria-hidden />
+                </button>
+              </li>
+            ))}
+          </ul>
+        ) : (
+          <div className="admin-doc-field">
+            <label className="admin-doc-label" htmlFor="import-md-text">
+              或直接粘贴 Markdown
+            </label>
+            <textarea
+              id="import-md-text"
+              className="admin-field-input"
+              rows={6}
+              value={pasted}
+              onChange={(e) => setPasted(e.target.value)}
+              placeholder="# 第一章 …"
+              spellCheck={false}
+            />
+            <p className="admin-doc-hint">{pasted.length} 字符</p>
+          </div>
+        )}
+
+        {fromEpub ? (
+          <p className="admin-doc-hint">epub 按目录顺序导入，每个目录项一章，不参与拆分。</p>
+        ) : (
+          <div className="admin-doc-field">
+            <p className="admin-doc-label">拆分方式（对每个文件生效）</p>
+            <div className="flex flex-col gap-1.5">
+              {SPLIT_OPTIONS.map((opt) => (
+                <label key={opt.value} className="flex items-center gap-2 cursor-pointer">
+                  <input
+                    type="radio"
+                    name="import-split"
+                    checked={splitLevel === opt.value}
+                    onChange={() => setSplitLevel(opt.value)}
+                    disabled={busy}
+                  />
+                  <span className="text-[13px]" style={{ color: "var(--ink)" }}>
+                    {opt.label}
+                  </span>
+                  <span className="meta text-[11.5px]">{opt.hint}</span>
+                </label>
+              ))}
+            </div>
+          </div>
+        )}
+
+        <div className="admin-doc-field">
+          <p className="admin-doc-label">拆分预览</p>
+          {sourceFiles.length === 0 ? (
+            <p className="meta text-[12.5px]">等待内容…</p>
+          ) : sourceFiles.length > 1 ? (
+            <>
+              <ul
+                className="rounded-xl px-3 py-2 max-h-40 overflow-y-auto j13-rail-scroll"
+                style={{ border: "1px solid var(--line)", background: "var(--panel-2)" }}
+              >
+                {perFileCounts.map((f, i) => (
+                  <li
+                    key={`${f.name}-${i}`}
+                    className="flex items-center justify-between gap-2 text-[12.5px] py-0.5"
+                    style={{ color: "var(--ink-2)" }}
+                  >
+                    <span className="truncate">{f.name}</span>
+                    <span className="meta text-[11.5px] shrink-0 tabular-nums">{f.count} 章</span>
+                  </li>
+                ))}
+              </ul>
+              <p className="admin-doc-hint">
+                共 {sourceFiles.length} 个文件 · 预计 {totalChapters} 章
+              </p>
+            </>
+          ) : willFallback ? (
+            <p className="meta text-[12.5px]">
+              未检测到所选级别的标题，将整篇导入为一章（标题取文件名）。
+            </p>
+          ) : (
+            <ul
+              className="rounded-xl px-3 py-2 max-h-40 overflow-y-auto j13-rail-scroll"
+              style={{ border: "1px solid var(--line)", background: "var(--panel-2)" }}
+            >
+              {(splitLevel === "none" ? [single!.name] : singleTitles).map((t, i) => (
+                <li key={i} className="text-[12.5px] py-0.5 truncate" style={{ color: "var(--ink-2)" }}>
+                  {i + 1}. {t}
+                </li>
+              ))}
+            </ul>
+          )}
+        </div>
+
+        {overTotal ? <p className="meta text-[12.5px]">内容总量超过 20MB，无法导入。</p> : null}
+        {oversizeChapters.length > 0 ? (
+          <p className="meta text-[12.5px]">
+            以下章节正文超过 100000 字，无法导入：{oversizeChapters.map((f) => f.name).join("、")}
+          </p>
+        ) : null}
+        {error ? (
+          <p className="admin-settings-row-error" role="alert">
+            {error}
+          </p>
+        ) : null}
+      </div>
+    </Modal>
+  );
+}

frontend/app/admin/library/LibraryCoverPicker.tsx

@@ -0,0 +1,150 @@
+"use client";
+
+import { Images, Loader2 } from "lucide-react";
+import { useEffect, useState } from "react";
+import Modal from "@/components/Modal";
+import { apiMyMedia, type MediaAttachment } from "@/lib/api";
+import { isOwnImage, variantURL, widthSrcSet } from "@/lib/responsiveImage";
+
+/** 来源标签映射 */
+const SOURCE_LABELS: Record<string, string> = {
+  library_cover: "书籍封面",
+  library_content: "书籍内容",
+  post: "帖子插图",
+};
+
+function sourceLabel(source?: string): string {
+  return SOURCE_LABELS[source || "post"] || source || "帖子插图";
+}
+
+/** 按来源分组（library_cover 优先，其次 library_content，最后 post/其他） */
+function groupBySource(items: MediaAttachment[]): [string, MediaAttachment[]][] {
+  const groups = new Map<string, MediaAttachment[]>();
+  for (const item of items) {
+    const key = item.source || "post";
+    if (!groups.has(key)) groups.set(key, []);
+    groups.get(key)!.push(item);
+  }
+  // 按优先级排序
+  const order = ["library_cover", "library_content", "post"];
+  return Array.from(groups.entries()).sort(
+    ([a], [b]) => order.indexOf(a) - order.indexOf(b)
+  );
+}
+
+/** 书籍封面图库选择弹窗：列出本人媒体库图片，按来源分组 */
+export default function LibraryCoverPicker({
+  open,
+  onClose,
+  onPick,
+}: {
+  open: boolean;
+  onClose: () => void;
+  onPick: (item: MediaAttachment) => void;
+}) {
+  const [items, setItems] = useState<MediaAttachment[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState("");
+
+  useEffect(() => {
+    if (!open) return;
+    let cancelled = false;
+    setLoading(true);
+    setError("");
+    void apiMyMedia()
+      .then((res) => {
+        if (cancelled) return;
+        if (res.error) {
+          setError(res.error);
+          setItems([]);
+          return;
+        }
+        setItems((res.attachments || []).filter((item) => item.kind === "image"));
+      })
+      .catch(() => {
+        if (!cancelled) setError("加载媒体库失败");
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [open]);
+
+  const groups = groupBySource(items);
+
+  return (
+    <Modal
+      open={open}
+      title="从图库选择封面"
+      description="已选作封面的图片会单独分组，再次选择直接复用。"
+      onClose={onClose}
+      maxWidthClass="max-w-2xl"
+      dismissOnOverlay
+    >
+      {loading ? (
+        <p className="meta text-[13px] flex items-center gap-2 py-6 justify-center">
+          <Loader2 size={14} className="animate-spin" /> 加载中
+        </p>
+      ) : error ? (
+        <p className="text-[13px] py-4" style={{ color: "var(--danger, #b42318)" }}>
+          {error}
+        </p>
+      ) : items.length === 0 ? (
+        <p className="meta text-[13px] py-6 text-center">
+          图库还没有图片。上传封面或发帖插图后，会自动出现在这里。
+        </p>
+      ) : (
+        <div className="flex flex-col gap-5 max-h-[60vh] overflow-y-auto">
+          {groups.map(([source, groupItems]) => (
+            <section key={source}>
+              <h4
+                className="text-[11.5px] font-bold tracking-wide uppercase mb-2 px-0.5"
+                style={{ color: "var(--ink-3)" }}
+              >
+                {sourceLabel(source)}
+                <span className="ml-1.5 font-normal opacity-70">({groupItems.length})</span>
+              </h4>
+              <div className="grid grid-cols-4 sm:grid-cols-5 gap-2">
+                {groupItems.map((item) => (
+                  <button
+                    key={item.id}
+                    type="button"
+                    onClick={() => {
+                      onPick(item);
+                      onClose();
+                    }}
+                    className="relative group aspect-square rounded-xl overflow-hidden"
+                    style={{ boxShadow: "0 0 0 1px var(--line)", background: "var(--panel-2)" }}
+                    data-tip={
+                      item.source === "library_cover"
+                        ? "已作封面，点击直接复用"
+                        : "复制一份用作封面"
+                    }
+                  >
+                    {/* eslint-disable-next-line @next/next/no-img-element */}
+                    <img
+                      src={isOwnImage(item.url) ? variantURL(item.url, 160) : item.url}
+                      srcSet={isOwnImage(item.url) ? widthSrcSet(item.url, [96, 160, 256, 384]) : undefined}
+                      sizes="(max-width:520px) 23vw, 96px"
+                      alt="图库候选封面"
+                      className="w-full h-full object-contain"
+                      loading="lazy"
+                    />
+                    <span
+                      className="pointer-events-none absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100"
+                      style={{ background: "color-mix(in srgb, var(--ink) 40%, transparent)", color: "#fff" }}
+                    >
+                      <Images size={14} />
+                    </span>
+                  </button>
+                ))}
+              </div>
+            </section>
+          ))}
+        </div>
+      )}
+    </Modal>
+  );
+}

frontend/app/admin/library/LibrarySectionsPanel.tsx

@@ -0,0 +1,506 @@
+"use client";
+
+import { useEffect, useMemo, useState, type ReactNode } from "react";
+import {
+  ChevronDown,
+  ChevronUp,
+  CornerDownRight,
+  ListTree,
+  Loader2,
+  Plus,
+  Save,
+  Trash2,
+  Upload,
+} from "lucide-react";
+import {
+  apiAdminCreateLibrarySection,
+  apiAdminDeleteLibrarySection,
+  apiAdminImportLibraryMarkdownBatch,
+  apiAdminMoveLibrarySection,
+  apiAdminUpdateLibrarySection,
+  type LibraryDoc,
+  type LibraryImportMdInput,
+  type LibrarySectionItem,
+} from "@/lib/api";
+import { toast } from "@/lib/toast";
+import ConfirmDialog from "@/components/ConfirmDialog";
+import MarkdownEditor from "@/components/MarkdownEditor";
+import { AdminEmpty } from "@/components/admin";
+import ImportMdDialog from "./ImportMdDialog";
+
+const MAX_TITLE = 200;
+const MAX_CONTENT = 100_000; // 与后端 MaxSectionContent 保持一致
+
+const EMPTY_SNAPSHOT = JSON.stringify({ title: "", content: "" });
+
+/**
+ * 「章节与正文」面板：左章节树（章 → 节 两级），右章节编辑器。
+ * 数据从 doc.sections 派生（后端 detail 已带全量含 content）；
+ * 所有变更后调 onChanged() 让父组件刷新列表，doc.sections 随之更新。
+ */
+export default function LibrarySectionsPanel({
+  doc,
+  onChanged,
+  onDirtyChange,
+}: {
+  doc: LibraryDoc;
+  /** 数据变更后由父组件刷新（doc.sections 随之更新） */
+  onChanged: () => Promise<void>;
+  /** dirty 状态上报，供父组件在关闭编辑器 / 切换条目前确认 */
+  onDirtyChange: (dirty: boolean) => void;
+}) {
+  const sections = doc.sections ?? [];
+
+  // 平铺 → 章分组（顺序沿用后端 sort_order）
+  const groups = useMemo(() => {
+    const gs: { chapter: LibrarySectionItem; subs: LibrarySectionItem[] }[] = [];
+    for (const s of sections) {
+      if (s.parent_id == null) gs.push({ chapter: s, subs: [] });
+      else gs[gs.length - 1]?.subs.push(s);
+    }
+    return gs;
+  }, [sections]);
+
+  const [selectedId, setSelectedId] = useState<number | null>(null);
+  const [title, setTitle] = useState("");
+  const [content, setContent] = useState("");
+  const [snapshot, setSnapshot] = useState(EMPTY_SNAPSHOT);
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState("");
+  const [pendingNav, setPendingNav] = useState<(() => void) | null>(null);
+  const [deleteTarget, setDeleteTarget] = useState<LibrarySectionItem | null>(null);
+  const [deleteBusy, setDeleteBusy] = useState(false);
+  const [importOpen, setImportOpen] = useState(false);
+  // 新建 / 导入后要选中的章节 id：等 doc.sections 里出现再应用，避免被旧数据清掉
+  const [pendingSelectId, setPendingSelectId] = useState<number | null>(null);
+
+  const selected = useMemo(
+    () => sections.find((s) => s.id === selectedId) ?? null,
+    [sections, selectedId]
+  );
+  const dirty = JSON.stringify({ title, content }) !== snapshot;
+
+  // dirty 上报给父组件；卸载时归零，避免残留的 dirty 影响父组件的关闭确认
+  useEffect(() => {
+    onDirtyChange(dirty);
+    return () => onDirtyChange(false);
+  }, [dirty, onDirtyChange]);
+
+  // 选中项被删除后清空选中
+  useEffect(() => {
+    if (selectedId != null && !sections.some((s) => s.id === selectedId)) {
+      setSelectedId(null);
+    }
+  }, [sections, selectedId]);
+
+  // 应用待选章节（新建 / 导入完成后）
+  useEffect(() => {
+    if (pendingSelectId == null) return;
+    const s = sections.find((x) => x.id === pendingSelectId);
+    if (!s) return;
+    setPendingSelectId(null);
+    setSelectedId(s.id);
+    setTitle(s.title);
+    setContent(s.content);
+    setSnapshot(JSON.stringify({ title: s.title, content: s.content }));
+    setError("");
+  }, [sections, pendingSelectId]);
+
+  function loadSection(s: LibrarySectionItem) {
+    setSelectedId(s.id);
+    setTitle(s.title);
+    setContent(s.content);
+    setSnapshot(JSON.stringify({ title: s.title, content: s.content }));
+    setError("");
+  }
+
+  /** dirty 时先弹确认，再执行动作（切换章节 / 打开导入 / 新增章节） */
+  function guardNav(action: () => void) {
+    if (dirty && !busy) setPendingNav(() => action);
+    else action();
+  }
+
+  function selectSection(s: LibrarySectionItem) {
+    if (s.id === selectedId) return;
+    guardNav(() => loadSection(s));
+  }
+
+  async function addSection(parent: LibrarySectionItem | null) {
+    setBusy(true);
+    setError("");
+    try {
+      const { section } = await apiAdminCreateLibrarySection(doc.id, {
+        parent_id: parent?.id,
+        title: parent ? "新节" : "新章",
+      });
+      await onChanged();
+      setPendingSelectId(section.id);
+      toast(parent ? "小节已添加" : "章已添加", "ok");
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "添加章节失败");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function save() {
+    if (selectedId == null) return;
+    const t = title.trim();
+    if (!t) {
+      setError("章节标题不能为空");
+      return;
+    }
+    setBusy(true);
+    setError("");
+    try {
+      const { section } = await apiAdminUpdateLibrarySection(selectedId, {
+        title: t,
+        content,
+      });
+      await onChanged();
+      // 以服务端返回为准（后端会 trim 标题），保证 dirty 归零
+      setTitle(section.title);
+      setContent(section.content);
+      setSnapshot(JSON.stringify({ title: section.title, content: section.content }));
+      toast("章节已保存", "ok");
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "保存章节失败");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function move(s: LibrarySectionItem, direction: "up" | "down") {
+    setBusy(true);
+    setError("");
+    try {
+      await apiAdminMoveLibrarySection(s.id, direction);
+      await onChanged(); // 选中 id 不变，原地刷新顺序
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "移动章节失败");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function removeSection() {
+    if (!deleteTarget) return;
+    const target = deleteTarget;
+    setDeleteBusy(true);
+    try {
+      await apiAdminDeleteLibrarySection(target.id);
+      toast(target.parent_id == null ? "章已删除" : "小节已删除", "ok");
+      setDeleteTarget(null);
+      await onChanged();
+      if (target.id === selectedId) {
+        setSelectedId(null);
+        setTitle("");
+        setContent("");
+        setSnapshot(EMPTY_SNAPSHOT);
+        setError("");
+      }
+    } catch (e) {
+      toast(e instanceof Error ? e.message : "删除章节失败");
+    } finally {
+      setDeleteBusy(false);
+    }
+  }
+
+  async function handleImport(input: LibraryImportMdInput) {
+    const res = await apiAdminImportLibraryMarkdownBatch(doc.id, input);
+    await onChanged();
+    return res.sections;
+  }
+
+  function closeImport(created?: LibrarySectionItem[]) {
+    setImportOpen(false);
+    if (created && created.length > 0) setPendingSelectId(created[0].id);
+  }
+
+  /** 该章节在同级兄弟中的位置（供上移/下移禁用判断） */
+  function siblingPos(s: LibrarySectionItem): { first: boolean; last: boolean } {
+    if (s.parent_id == null) {
+      const i = groups.findIndex((g) => g.chapter.id === s.id);
+      return { first: i <= 0, last: i < 0 || i >= groups.length - 1 };
+    }
+    const g = groups.find((x) => x.subs.some((y) => y.id === s.id));
+    const subs = g?.subs ?? [];
+    const i = subs.findIndex((y) => y.id === s.id);
+    return { first: i <= 0, last: i < 0 || i >= subs.length - 1 };
+  }
+
+  function RowAction({
+    label,
+    onClick,
+    disabled,
+    children,
+  }: {
+    label: string;
+    onClick: () => void;
+    disabled?: boolean;
+    children: ReactNode;
+  }) {
+    return (
+      <button
+        type="button"
+        className="w-6 h-6 shrink-0 rounded-md flex items-center justify-center hover:bg-[var(--panel)] transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
+        style={{ color: "var(--ink-3)" }}
+        title={label}
+        aria-label={label}
+        disabled={disabled}
+        onClick={onClick}
+      >
+        {children}
+      </button>
+    );
+  }
+
+  function row(s: LibrarySectionItem, depth: 0 | 1, isFirst: boolean, isLast: boolean) {
+    const active = s.id === selectedId;
+    const pos = siblingPos(s);
+    return (
+      <div
+        key={s.id}
+        className="flex items-center gap-0.5 pr-1.5"
+        style={{
+          paddingLeft: depth === 0 ? 4 : 22,
+          background: active ? "var(--accent-soft)" : undefined,
+          boxShadow: active ? "inset 2px 0 0 var(--accent)" : undefined,
+        }}
+      >
+        <button
+          type="button"
+          onClick={() => selectSection(s)}
+          aria-current={active ? "true" : undefined}
+          className="min-w-0 flex-1 text-left px-2 py-2 flex items-center gap-1 rounded-md transition-colors hover:bg-[var(--panel-2)]"
+          title={s.title}
+        >
+          {depth === 1 ? (
+            <CornerDownRight
+              size={12}
+              className="shrink-0"
+              style={{ color: "var(--ink-3)" }}
+              aria-hidden
+            />
+          ) : null}
+          <span
+            className="truncate text-[13px]"
+            style={{
+              color: active ? "var(--accent)" : "var(--ink)",
+              fontWeight: depth === 0 ? 600 : 400,
+            }}
+          >
+            {s.title || "未命名章节"}
+          </span>
+        </button>
+        {active ? (
+          <>
+            <RowAction label="上移" disabled={pos.first || busy} onClick={() => void move(s, "up")}>
+              <ChevronUp size={13} aria-hidden />
+            </RowAction>
+            <RowAction label="下移" disabled={pos.last || busy} onClick={() => void move(s, "down")}>
+              <ChevronDown size={13} aria-hidden />
+            </RowAction>
+            {depth === 0 ? (
+              <RowAction
+                label="添加小节"
+                disabled={busy}
+                onClick={() => void addSection(s)}
+              >
+                <CornerDownRight size={13} aria-hidden />
+              </RowAction>
+            ) : null}
+            <RowAction label="删除" onClick={() => setDeleteTarget(s)}>
+              <Trash2 size={13} aria-hidden />
+            </RowAction>
+          </>
+        ) : null}
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex h-full min-h-0">
+      {/* 左：章节树 */}
+      <aside
+        className="w-52 sm:w-60 shrink-0 flex flex-col min-h-0"
+        style={{ borderRight: "1px solid var(--line)" }}
+        aria-label="章节树"
+      >
+        <div
+          className="shrink-0 flex items-center gap-1.5 px-2.5 py-2.5 flex-wrap"
+          style={{ borderBottom: "1px solid var(--line)", background: "var(--panel-2)" }}
+        >
+          <button
+            type="button"
+            className="btn btn-line btn-sm"
+            disabled={busy}
+            onClick={() => guardNav(() => void addSection(null))}
+          >
+            <Plus size={13} aria-hidden /> 添加章
+          </button>
+          <button
+            type="button"
+            className="btn btn-line btn-sm"
+            disabled={busy}
+            onClick={() => guardNav(() => setImportOpen(true))}
+          >
+            <Upload size={13} aria-hidden /> 导入
+          </button>
+        </div>
+        <div className="flex-1 min-h-0 overflow-y-auto j13-rail-scroll py-1.5">
+          {groups.length === 0 ? (
+            <p className="meta text-[12.5px] px-3 py-3 leading-relaxed">
+              还没有章节。点上方「添加章」手动编写，或「导入」批量导入 .md / .epub（epub 按目录顺序拆章）。
+            </p>
+          ) : (
+            groups.map((g, gi) => (
+              <div key={g.chapter.id}>
+                {row(g.chapter, 0, gi === 0, gi === groups.length - 1)}
+                {g.subs.map((sub, si) => row(sub, 1, si === 0, si === g.subs.length - 1))}
+              </div>
+            ))
+          )}
+        </div>
+        <div
+          className="shrink-0 px-3 py-2 meta text-[11.5px] tabular-nums"
+          style={{ borderTop: "1px solid var(--line)" }}
+        >
+          {sections.length} 章节
+        </div>
+      </aside>
+
+      {/* 右：章节编辑器 */}
+      <div className="flex-1 min-w-0 flex flex-col min-h-0">
+        {selected ? (
+          <>
+            <div className="flex-1 min-h-0 overflow-y-auto j13-rail-scroll px-4 sm:px-5 py-4 flex flex-col gap-4">
+              <div className="admin-doc-field">
+                <label className="admin-doc-label" htmlFor="lib-section-title">
+                  章节标题
+                </label>
+                <input
+                  id="lib-section-title"
+                  className="admin-field-input"
+                  maxLength={MAX_TITLE}
+                  value={title}
+                  onChange={(e) => {
+                    setError("");
+                    setTitle(e.target.value);
+                  }}
+                  placeholder="例如：第一章 …"
+                  disabled={busy}
+                />
+              </div>
+              {/* flex-1 撑满滚动区剩余高度：编辑框最大化、提示行紧贴底部操作条上方 */}
+              <div className="admin-doc-md flex flex-col flex-1 min-h-0">
+                <label className="admin-doc-label" htmlFor="lib-section-content">
+                  正文（Markdown）
+                </label>
+                <MarkdownEditor
+                  id="lib-section-content"
+                  value={content}
+                  onChange={(v) => {
+                    setError("");
+                    setContent(v.slice(0, MAX_CONTENT));
+                  }}
+                  maxChars={MAX_CONTENT}
+                  allowHide={false}
+                  entriesAuto={doc.entries_auto ?? false}
+                  placeholder="本章正文，支持 Markdown…"
+                  rows={16}
+                  ariaLabel="章节正文"
+                  uploadSource="library_content"
+                />
+              </div>
+            </div>
+
+            {/* 底部操作条：不随正文滚动 */}
+            <footer
+              className="shrink-0 flex items-center gap-2 px-3.5 sm:px-4 py-3"
+              style={{ borderTop: "1px solid var(--line)", background: "var(--panel-2)" }}
+            >
+              <div className="mr-auto flex items-center gap-3 min-w-0">
+                {error ? (
+                  <p className="admin-settings-row-error" role="alert">
+                    {error}
+                  </p>
+                ) : dirty ? (
+                  <span className="meta text-[12px]">有未保存的修改</span>
+                ) : null}
+              </div>
+              <button
+                type="button"
+                className="btn btn-line btn-sm"
+                disabled={busy || deleteBusy}
+                onClick={() => setDeleteTarget(selected)}
+              >
+                <Trash2 size={13} aria-hidden /> 删除章节
+              </button>
+              <button
+                type="button"
+                className="btn btn-primary btn-sm"
+                disabled={busy || !dirty}
+                title={dirty ? undefined : "没有需要保存的修改"}
+                onClick={() => void save()}
+                aria-busy={busy || undefined}
+              >
+                {busy ? (
+                  <Loader2 size={13} className="animate-spin" aria-hidden />
+                ) : (
+                  <Save size={13} aria-hidden />
+                )}
+                {busy ? "保存中…" : "保存章节"}
+              </button>
+            </footer>
+          </>
+        ) : (
+          <div className="flex-1 min-h-0 flex items-center justify-center p-6">
+            <AdminEmpty
+              icon={<ListTree size={22} />}
+              title="未选择章节"
+              description="从左侧选择章节编辑，或添加章 / 导入 Markdown"
+            />
+          </div>
+        )}
+      </div>
+
+      {/* 未保存切换章节确认 */}
+      <ConfirmDialog
+        open={!!pendingNav}
+        title="放弃未保存的修改？"
+        message="当前章节有未保存的修改，继续将丢失这些改动。"
+        danger
+        confirmLabel="放弃修改"
+        cancelLabel="继续编辑"
+        onCancel={() => setPendingNav(null)}
+        onConfirm={() => {
+          const action = pendingNav;
+          setPendingNav(null);
+          action?.();
+        }}
+      />
+
+      {/* 删除章节确认 */}
+      <ConfirmDialog
+        open={!!deleteTarget}
+        title={deleteTarget?.parent_id == null ? "删除章" : "删除小节"}
+        message={
+          deleteTarget
+            ? `确定删除「${deleteTarget.title}」吗？${
+                deleteTarget.parent_id == null ? "其下所有小节将一并删除，" : ""
+              }且不可恢复。`
+            : ""
+        }
+        danger
+        busy={deleteBusy}
+        confirmLabel="删除"
+        onCancel={() => !deleteBusy && setDeleteTarget(null)}
+        onConfirm={() => void removeSection()}
+      />
+
+      {/* 导入 Markdown 拆章 */}
+      {importOpen ? <ImportMdDialog onImport={handleImport} onClose={closeImport} /> : null}
+    </div>
+  );
+}

frontend/app/admin/library/page.tsx

@@ -0,0 +1,36 @@
+import type { Metadata } from "next";
+import { Suspense } from "react";
+import { cookies } from "next/headers";
+import LibraryAdmin from "./LibraryAdmin";
+import { authCookieHeader } from "@/lib/cookies";
+import { fetchAdminLibraryDocs, type LibraryDoc } from "@/lib/api";
+import { getMeCached } from "@/lib/serverData";
+import { hasPerm, PERMS } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+
+export const metadata: Metadata = {
+  title: "书库管理",
+};
+
+export default async function AdminLibraryPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !hasPerm(me.user, PERMS.LIBRARY)) {
+    return <Forbidden text="书库管理仅管理员及以上角色可操作。" />;
+  }
+
+  let initial: LibraryDoc[] = [];
+  let initError = "";
+  try {
+    const res = await fetchAdminLibraryDocs(cookie || undefined);
+    initial = res.docs ?? [];
+  } catch (e) {
+    initError = e instanceof Error ? e.message : "加载书库失败";
+  }
+
+  return (
+    <Suspense fallback={<p className="meta px-1 py-6">加载书库列表…</p>}>
+      <LibraryAdmin initial={initial} initError={initError} />
+    </Suspense>
+  );
+}

frontend/app/admin/library/parseEpub.ts

@@ -0,0 +1,91 @@
+/**
+ * epub 导入解析（浏览器端）：epub 本质是 zip + XHTML。
+ * 流程：JSZip 解压 → META-INF/container.xml 找 OPF → 按 spine 顺序读 XHTML
+ * → 清理（去 script/style、剔除内部相对路径图片）→ turndown 转 Markdown。
+ * 产物直接作为伪 .md 文件走现有批量导入接口，后端零改动。
+ * 两个依赖均在本模块内动态 import，避免打进主包。
+ */
+
+export interface EpubChapter {
+  title: string;
+  markdown: string;
+}
+
+/** 以 OPF 所在目录为基准解析 zip 内相对路径（处理 ./ ../ 与 URL 编码） */
+function resolveZipPath(base: string, href: string): string {
+  const parts = `${base}${href}`.split("/");
+  const out: string[] = [];
+  for (const p of parts) {
+    if (!p || p === ".") continue;
+    if (p === "..") out.pop();
+    else out.push(p);
+  }
+  return out.join("/");
+}
+
+/** 清理标题里不适合做文件名的字符 */
+function sanitizeTitle(t: string): string {
+  return t.replace(/[\\/:*?"<>|\n\r\t]+/g, " ").trim().slice(0, 60);
+}
+
+export async function parseEpub(file: File): Promise<EpubChapter[]> {
+  const { default: JSZip } = await import("jszip");
+  const { default: TurndownService } = await import("turndown");
+  const zip = await JSZip.loadAsync(await file.arrayBuffer()).catch(() => {
+    throw new Error("无法读取 epub：不是有效的 zip 文件");
+  });
+
+  // container.xml → OPF 路径
+  const containerEntry = zip.file("META-INF/container.xml");
+  if (!containerEntry) throw new Error("无法读取 epub：缺少 META-INF/container.xml");
+  const containerDoc = new DOMParser().parseFromString(await containerEntry.async("text"), "application/xml");
+  const rootfilePath = containerDoc.querySelector("rootfile")?.getAttribute("full-path");
+  if (!rootfilePath) throw new Error("无法读取 epub：container.xml 未声明 OPF 文件");
+
+  // OPF → manifest（id → href/mediaType）+ spine（阅读顺序）
+  const opfEntry = zip.file(rootfilePath) ?? zip.file(decodeURIComponent(rootfilePath));
+  if (!opfEntry) throw new Error(`无法读取 epub：缺少 OPF 文件 ${rootfilePath}`);
+  const opfDoc = new DOMParser().parseFromString(await opfEntry.async("text"), "application/xml");
+  const opfDir = rootfilePath.includes("/") ? rootfilePath.slice(0, rootfilePath.lastIndexOf("/") + 1) : "";
+
+  const manifest = new Map<string, { href: string; mediaType: string }>();
+  opfDoc.querySelectorAll("manifest > item").forEach((item) => {
+    const id = item.getAttribute("id");
+    const href = item.getAttribute("href");
+    if (id && href) manifest.set(id, { href, mediaType: item.getAttribute("media-type") ?? "" });
+  });
+  const spineIds = Array.from(opfDoc.querySelectorAll("spine > itemref"))
+    .map((el) => el.getAttribute("idref"))
+    .filter((id): id is string => !!id);
+
+  const td = new TurndownService({ headingStyle: "atx", codeBlockStyle: "fenced" });
+  const chapters: EpubChapter[] = [];
+
+  for (const id of spineIds) {
+    const item = manifest.get(id);
+    // spine 里也会有图片/样式等资源项，只处理 HTML 文档
+    if (!item || !/xhtml|html/i.test(item.mediaType)) continue;
+    const path = resolveZipPath(opfDir, item.href);
+    const entry = zip.file(path) ?? zip.file(decodeURIComponent(path));
+    if (!entry) continue;
+    const doc = new DOMParser().parseFromString(await entry.async("text"), "text/html");
+    doc.querySelectorAll("script, style").forEach((el) => el.remove());
+    // 内部相对路径图片导入后无法解析，剔除；外链 http(s) 图片保留
+    doc.querySelectorAll("img").forEach((img) => {
+      if (!/^https?:\/\//i.test(img.getAttribute("src") ?? "")) img.remove();
+    });
+    const body = doc.body;
+    if (!body) continue;
+    const markdown = td
+      .turndown(body.innerHTML)
+      .replace(/\n{3,}/g, "\n\n")
+      .trim();
+    if (!markdown) continue; // 封面页等纯图片页
+    const heading = Array.from(body.querySelectorAll("h1, h2, h3, h4, h5, h6")).find((h) => h.textContent?.trim());
+    const title = sanitizeTitle(heading?.textContent ?? doc.title ?? "") || `第 ${chapters.length + 1} 章`;
+    chapters.push({ title, markdown });
+  }
+
+  if (chapters.length === 0) throw new Error("未能从 epub 中解析出任何章节");
+  return chapters;
+}

frontend/app/admin/media/MediaLibrary.tsx

@@ -5,6 +5,7 @@ import { Images, Copy, ExternalLink, Eye, Check } from "lucide-react";
 import Modal from "@/components/Modal";
 import AdminEmpty from "@/components/admin/AdminEmpty";
 import type { MediaLibraryItem } from "@/lib/api";
+import { isOwnImage, variantURL, widthSrcSet } from "@/lib/responsiveImage";
 
 function formatBytes(n: number): string {
   if (n < 1024) return `${n} B`;
@@ -24,10 +25,11 @@ function formatDims(item: MediaLibraryItem): string {
   return "—";
 }
 
-/** 网格缩略图：本地图走服务端缩略接口（磁盘缓存），远程对象直连原图（头像类本身小） */
+/** 网格缩略图：本站图走统一变体端点（磁盘缓存，256 档）；非本站图原样返回 */
 function thumbSrc(item: MediaLibraryItem): string {
-  if (item.url.startsWith("/uploads/")) {
-    return `/api/admin/media-library/thumb?u=${encodeURIComponent(item.url)}`;
+  // 网格缩略走统一变体端点（256 档）；非本站图原样返回
+  if (isOwnImage(item.url)) {
+    return variantURL(item.url, 256);
   }
   return item.url;
 }
@@ -143,6 +145,8 @@ export default function MediaLibrary({
             <span className="block relative aspect-square overflow-hidden">
               <img
                 src={thumbSrc(item)}
+                srcSet={isOwnImage(item.url) ? widthSrcSet(item.url, [160, 256, 384, 512]) : undefined}
+                sizes="(min-width:1280px) 16vw, (min-width:1024px) 25vw, (min-width:640px) 33vw, 50vw"
                 alt={item.name}
                 loading="lazy"
                 className="absolute inset-0 w-full h-full object-cover"

frontend/app/admin/pages/PagesAdmin.tsx

@@ -4,7 +4,7 @@ import { useEffect, useMemo, useRef, useState } from "react";
 import Link from "next/link";
 import { useRouter, useSearchParams } from "next/navigation";
 import { Ellipsis, ExternalLink, FileText, Plus } from "lucide-react";
-import { apiAdminDeleteSitePage, type SitePage } from "@/lib/api";
+import { apiAdminDeleteSitePage, apiAdminPurgeSitePage, type SitePage } from "@/lib/api";
 import { formatDateTime, formatRelative } from "@/lib/format";
 import { sitePagePublicPath } from "@/lib/sitePagePath";
 import { useUrlStyle } from "@/components/SiteBrandProvider";
@@ -61,8 +61,14 @@ export default function PagesAdmin({
   const [menuUp, setMenuUp] = useState(false);
   const menuRef = useRef<HTMLDivElement>(null);
 
-  const publishedCount = useMemo(() => list.filter((p) => p.published).length, [list]);
-  const draftCount = useMemo(() => list.filter((p) => !p.published).length, [list]);
+  const publishedCount = useMemo(
+    () => list.filter((p) => p.published && !p.deleted).length,
+    [list]
+  );
+  const draftCount = useMemo(
+    () => list.filter((p) => !p.published && !p.deleted).length,
+    [list]
+  );
 
   const filtered = useMemo(() => {
     if (statusFilter === "published") return list.filter((p) => p.published);
@@ -93,9 +99,16 @@ export default function PagesAdmin({
   async function remove(p: SitePage) {
     setDeletingId(p.id);
     try {
-      await apiAdminDeleteSitePage(p.id);
-      setList((l) => l.filter((x) => x.id !== p.id));
-      toast("页面已删除", "ok");
+      if (p.deleted) {
+        // 已软删的页面：彻底删除（不可恢复，释放 slug）
+        await apiAdminPurgeSitePage(p.id);
+        setList((l) => l.filter((x) => x.id !== p.id));
+        toast("页面已彻底删除，地址可重新使用", "ok");
+      } else {
+        await apiAdminDeleteSitePage(p.id);
+        setList((l) => l.map((x) => (x.id === p.id ? { ...x, deleted: true } : x)));
+        toast("页面已删除，可在列表中彻底删除以释放地址", "ok");
+      }
     } catch (e) {
       toast(e instanceof Error ? e.message : "删除失败");
     } finally {
@@ -170,20 +183,30 @@ export default function PagesAdmin({
                   const updated = p.updated_at || "";
                   const path = sitePagePublicPath(p.slug, urlStyle);
                   return (
-                    <tr key={p.id}>
+                    <tr key={p.id} style={p.deleted ? { opacity: 0.65 } : undefined}>
                       <td data-label="页面">
-                        <Link href={editHref(p.id, statusFilter)} className="admin-doc-title" title={p.title}>
-                          {p.title}
-                        </Link>
+                        {p.deleted ? (
+                          <span className="admin-doc-title" title={p.title}>
+                            {p.title}
+                          </span>
+                        ) : (
+                          <Link href={editHref(p.id, statusFilter)} className="admin-doc-title" title={p.title}>
+                            {p.title}
+                          </Link>
+                        )}
                         <p className="admin-doc-path">
                           <code>{path}</code>
                         </p>
                         {p.excerpt ? <p className="admin-doc-excerpt">{p.excerpt}</p> : null}
                       </td>
                       <td data-label="状态">
-                        <AdminStatusChip tone={p.published ? "ok" : "warn"}>
-                          {p.published ? "已发布" : "草稿"}
-                        </AdminStatusChip>
+                        {p.deleted ? (
+                          <AdminStatusChip tone="danger">已删除</AdminStatusChip>
+                        ) : (
+                          <AdminStatusChip tone={p.published ? "ok" : "warn"}>
+                            {p.published ? "已发布" : "草稿"}
+                          </AdminStatusChip>
+                        )}
                       </td>
                       <td data-label="展示位置">{placeLabel(p)}</td>
                       <td data-label="排序" className="tabular-nums">
@@ -200,10 +223,12 @@ export default function PagesAdmin({
                       </td>
                       <td data-label="操作">
                         <div className="admin-doc-row-actions">
-                          <Link href={editHref(p.id, statusFilter)} className="admin-doc-textbtn">
-                            编辑
-                          </Link>
-                          {p.published ? (
+                          {!p.deleted ? (
+                            <Link href={editHref(p.id, statusFilter)} className="admin-doc-textbtn">
+                              编辑
+                            </Link>
+                          ) : null}
+                          {p.published && !p.deleted ? (
                             <a
                               href={path}
                               target="_blank"
@@ -248,7 +273,7 @@ export default function PagesAdmin({
                                     setDeleteTarget(p);
                                   }}
                                 >
-                                  删除
+                                  {p.deleted ? "彻底删除" : "删除"}
                                 </button>
                               </div>
                             ) : null}
@@ -277,15 +302,17 @@ export default function PagesAdmin({
 
       <ConfirmDialog
         open={!!deleteTarget}
-        title="删除单页"
+        title={deleteTarget?.deleted ? "彻底删除单页" : "删除单页"}
         message={
           deleteTarget
-            ? `确定删除「${deleteTarget.title}」吗？当前为${deleteTarget.published ? "已发布" : "草稿"}。删除后前台不再显示，后台也不能恢复。`
+            ? deleteTarget.deleted
+              ? `确定彻底删除「${deleteTarget.title}」吗？删除后不可恢复，地址将释放可重新使用。`
+              : `确定删除「${deleteTarget.title}」吗？当前为${deleteTarget.published ? "已发布" : "草稿"}。删除后前台不再显示，可在列表中彻底删除以释放地址。`
             : ""
         }
         danger
         busy={deletingId != null}
-        confirmLabel="删除"
+        confirmLabel={deleteTarget?.deleted ? "彻底删除" : "删除"}
         onCancel={() => deletingId == null && setDeleteTarget(null)}
         onConfirm={() => {
           if (deleteTarget) void remove(deleteTarget);

frontend/app/admin/pages/[id]/edit/page.tsx

@@ -3,7 +3,7 @@ import { Suspense } from "react";
 import { cookies } from "next/headers";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../../../Forbidden";
 import PageEditLoader from "./PageEditLoader";
 
@@ -19,7 +19,7 @@ export default async function AdminPageEditPage({ params }: PageProps) {
   const { id } = await params;
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.PAGES)) {
     return <Forbidden text="单页管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/pages/new/page.tsx

@@ -3,7 +3,7 @@ import { Suspense } from "react";
 import { cookies } from "next/headers";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../../Forbidden";
 import PageComposeClient from "../PageComposeClient";
 
@@ -14,7 +14,7 @@ export const metadata: Metadata = {
 export default async function AdminPageNewPage() {
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.PAGES)) {
     return <Forbidden text="单页管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/pages/page.tsx

@@ -5,7 +5,7 @@ import PagesAdmin from "./PagesAdmin";
 import { authCookieHeader } from "@/lib/cookies";
 import { fetchAdminSitePages, type SitePage } from "@/lib/api";
 import { getMeCached } from "@/lib/serverData";
-import { isAdminOrAbove } from "@/lib/roles";
+import { hasPerm, PERMS } from "@/lib/roles";
 import Forbidden from "../Forbidden";
 
 export const metadata: Metadata = {
@@ -15,7 +15,7 @@ export const metadata: Metadata = {
 export default async function AdminPagesPage() {
   const cookie = authCookieHeader(await cookies());
   const me = await getMeCached(cookie || undefined);
-  if (!me.user || !isAdminOrAbove(me.user.role)) {
+  if (!me.user || !hasPerm(me.user, PERMS.PAGES)) {
     return <Forbidden text="单页管理仅管理员及以上角色可操作。" />;
   }
 

frontend/app/admin/settings/BasicSettings.tsx

@@ -6,6 +6,8 @@ import useUnsavedGuard from "@/hooks/useUnsavedGuard";
 import BasicIdentityPanel from "./BasicIdentityPanel";
 import BrandSeoPanel from "./BrandSeoPanel";
 import FooterLinksPanel from "./FooterLinksPanel";
+import HeaderNavPanel from "./HeaderNavPanel";
+import MobileTabBarPanel from "./MobileTabBarPanel";
 import UrlStylePanel from "./UrlStylePanel";
 import type { PublicSettings } from "@/lib/api";
 
@@ -15,19 +17,25 @@ export default function BasicSettings({ initial }: { initial: PublicSettings })
   const [brandDirty, setBrandDirty] = useState(false);
   const [seoDirty, setSeoDirty] = useState(false);
   const [urlStyleDirty, setUrlStyleDirty] = useState(false);
-  const dirty = basicDirty || brandDirty || seoDirty || urlStyleDirty;
+  const [mobileTabsDirty, setMobileTabsDirty] = useState(false);
+  const [headerNavDirty, setHeaderNavDirty] = useState(false);
+  const dirty = basicDirty || brandDirty || seoDirty || urlStyleDirty || mobileTabsDirty || headerNavDirty;
   const leave = useUnsavedGuard(dirty);
 
   const onBasicDirty = useCallback((d: boolean) => setBasicDirty(d), []);
   const onBrandDirty = useCallback((d: boolean) => setBrandDirty(d), []);
   const onSeoDirty = useCallback((d: boolean) => setSeoDirty(d), []);
   const onUrlStyleDirty = useCallback((d: boolean) => setUrlStyleDirty(d), []);
+  const onMobileTabsDirty = useCallback((d: boolean) => setMobileTabsDirty(d), []);
+  const onHeaderNavDirty = useCallback((d: boolean) => setHeaderNavDirty(d), []);
 
   return (
     <div className="admin-settings-stack">
       <BasicIdentityPanel initial={live} onSaved={setLive} onDirtyChange={onBasicDirty} />
       <BrandSeoPanel initial={live} onSaved={setLive} onDirtyChange={onBrandDirty} />
       <UrlStylePanel initial={live} onSaved={setLive} onDirtyChange={onUrlStyleDirty} />
+      <HeaderNavPanel initial={live} onSaved={setLive} onDirtyChange={onHeaderNavDirty} />
+      <MobileTabBarPanel initial={live} onSaved={setLive} onDirtyChange={onMobileTabsDirty} />
       <FooterLinksPanel initial={live} onSaved={setLive} onDirtyChange={onSeoDirty} />
       <ConfirmDialog
         open={leave.leaveOpen}

frontend/app/admin/settings/BrandMediaPicker.tsx

@@ -3,8 +3,9 @@
 import { Images, Loader2 } from "lucide-react";
 import { useEffect, useState } from "react";
 import Modal from "@/components/Modal";
-import { apiMyMedia, type MediaAttachment } from "@/lib/api";
-import { mediaURLFitsSlot, type BrandSlot } from "@/lib/brand";
+import { apiAdminMediaLibrary, apiMyMedia } from "@/lib/api";
+import { normalizeBrandURL, type BrandSlot } from "@/lib/brand";
+import { isOwnImage, variantURL, widthSrcSet } from "@/lib/responsiveImage";
 
 const SLOT_LABEL: Record<BrandSlot, string> = {
   logo_light: "浅色 Logo",
@@ -12,6 +13,13 @@ const SLOT_LABEL: Record<BrandSlot, string> = {
   favicon: "Favicon",
 };
 
+/** 选图条目：本人附件带 attachmentId；品牌目录历史图仅 URL（已在品牌目录，无需复制） */
+export type BrandPickItem = {
+  key: string;
+  url: string;
+  attachmentId: number | null;
+};
+
 export default function BrandMediaPicker({
   open,
   slot,
@@ -21,9 +29,9 @@ export default function BrandMediaPicker({
   open: boolean;
   slot: BrandSlot;
   onClose: () => void;
-  onPick: (item: MediaAttachment) => void;
+  onPick: (item: BrandPickItem) => void;
 }) {
-  const [items, setItems] = useState<MediaAttachment[]>([]);
+  const [items, setItems] = useState<BrandPickItem[]>([]);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState("");
 
@@ -32,16 +40,29 @@ export default function BrandMediaPicker({
     let cancelled = false;
     setLoading(true);
     setError("");
-    void apiMyMedia()
-      .then((res) => {
+    // 本人附件 + 媒体库盘点里的品牌目录历史图（品牌图不落附件，需合并展示）
+    Promise.all([apiMyMedia(), apiAdminMediaLibrary().catch(() => null)])
+      .then(([mediaRes, libRes]) => {
         if (cancelled) return;
-        if (res.error) {
-          setError(res.error);
+        if (mediaRes.error) {
+          setError(mediaRes.error);
           setItems([]);
           return;
         }
-        const all = res.attachments || [];
-        setItems(all.filter((item) => mediaURLFitsSlot(slot, item.url)));
+        const out: BrandPickItem[] = (mediaRes.attachments || []).map((a) => ({
+          key: `att-${a.id}`,
+          url: a.url,
+          attachmentId: a.id,
+        }));
+        const seen = new Set(out.map((i) => i.url));
+        for (const it of libRes?.items || []) {
+          if (it.category !== "brand") continue;
+          if (!normalizeBrandURL(slot, it.url)) continue;
+          if (seen.has(it.url)) continue;
+          seen.add(it.url);
+          out.unshift({ key: `brand-${it.url}`, url: it.url, attachmentId: null });
+        }
+        setItems(out);
       })
       .catch(() => {
         if (!cancelled) setError("加载媒体库失败");
@@ -58,7 +79,7 @@ export default function BrandMediaPicker({
     <Modal
       open={open}
       title={`从媒体库选择 · ${SLOT_LABEL[slot]}`}
-      description="只列出格式符合的图片。保存后会复制一份到品牌目录，之后删除原图不会影响 Logo。"
+      description="位图选中后进入裁剪并转成 WebP；SVG / ICO 与历史品牌图直接引用，之后删除原图不会影响 Logo。"
       onClose={onClose}
       maxWidthClass="max-w-lg"
       dismissOnOverlay
@@ -72,12 +93,12 @@ export default function BrandMediaPicker({
           {error}
         </p>
       ) : items.length === 0 ? (
-        <p className="meta text-[13px] py-6 text-center">没有可用图片。Logo 需要 PNG / WebP / SVG，Favicon 还可选 ICO。</p>
+        <p className="meta text-[13px] py-6 text-center">媒体库还没有图片，先上传一张吧。</p>
       ) : (
         <div className="grid grid-cols-4 sm:grid-cols-5 gap-2">
           {items.map((item) => (
             <button
-              key={item.id}
+              key={item.key}
               type="button"
               onClick={() => {
                 onPick(item);
@@ -88,7 +109,14 @@ export default function BrandMediaPicker({
               data-tip="用作草稿预览，点保存后才生效"
             >
               {/* eslint-disable-next-line @next/next/no-img-element */}
-              <img src={item.url} alt={`${SLOT_LABEL[slot]}候选图`} className="w-full h-full object-contain" loading="lazy" />
+              <img
+                src={isOwnImage(item.url) ? variantURL(item.url, 160) : item.url}
+                srcSet={isOwnImage(item.url) ? widthSrcSet(item.url, [96, 160, 256, 384]) : undefined}
+                sizes="(max-width:520px) 23vw, 96px"
+                alt={`${SLOT_LABEL[slot]}候选图`}
+                className="w-full h-full object-contain"
+                loading="lazy"
+              />
               <span
                 className="pointer-events-none absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100"
                 style={{ background: "color-mix(in srgb, var(--ink) 40%, transparent)", color: "#fff" }}

frontend/app/admin/settings/BrandSeoPanel.tsx

@@ -1,25 +1,29 @@
 "use client";
 
-import { ImagePlus, Images, X } from "lucide-react";
+import { Check, ImagePlus, Images, Link2, X } from "lucide-react";
 import { useEffect, useRef, useState, type Dispatch, type SetStateAction } from "react";
 import {
   AdminSegmented,
   AdminSettingsActions,
   AdminSettingsGroup,
 } from "@/components/admin";
+import BrandCropModal from "@/components/BrandCropModal";
 import BrandLockup from "@/components/BrandLockup";
 import { apiBrandFromMedia, apiUpdateSiteSettings, apiUploadBrand, type PublicSettings } from "@/lib/api";
 import {
   BRAND_LOGO_FITS,
   BRAND_LOGO_SIZES,
   brandAccept,
+  brandAliasPath,
   brandFileOk,
+  normalizeBrandURL,
   type BrandLogoFit,
   type BrandLogoSize,
   type BrandMark,
   type BrandSlot,
 } from "@/lib/brand";
 import { toast } from "@/lib/toast";
+import { densitySrcSet, isOwnImage, pickVariantWidth, variantURL } from "@/lib/responsiveImage";
 import BrandMediaPicker from "./BrandMediaPicker";
 
 type SlotDraft = {
@@ -75,6 +79,10 @@ export default function BrandSeoPanel({
   const [saving, setSaving] = useState(false);
   const [saveError, setSaveError] = useState("");
   const [picker, setPicker] = useState<BrandSlot | null>(null);
+  const [cropSlot, setCropSlot] = useState<BrandSlot | null>(null);
+  const [cropSeedFile, setCropSeedFile] = useState<File | null>(null);
+  const [cropSeedUrl, setCropSeedUrl] = useState("");
+  const [copiedSlot, setCopiedSlot] = useState<BrandSlot | null>(null);
   const blobs = useRef<string[]>([]);
   const saveGen = useRef(0);
 
@@ -120,6 +128,18 @@ export default function BrandSeoPanel({
     return draft.committed;
   };
 
+  const openCrop = (slot: BrandSlot, file: File | null, url: string) => {
+    setCropSlot(slot);
+    setCropSeedFile(file);
+    setCropSeedUrl(url);
+  };
+
+  const closeCrop = () => {
+    setCropSlot(null);
+    setCropSeedFile(null);
+    setCropSeedUrl("");
+  };
+
   const discard = () => {
     [light, dark, favicon].forEach((d) => {
       if (d.blob) URL.revokeObjectURL(d.blob);
@@ -203,6 +223,21 @@ export default function BrandSeoPanel({
   const slotDraft = (id: BrandSlot) =>
     id === "logo_dark" ? dark : id === "favicon" ? favicon : light;
 
+  // 已保存的槽位 URL：存在才展示固定地址（未保存过无图可引用）
+  const savedOf = (slot: BrandSlot) =>
+    slot === "logo_dark" ? saved.dark : slot === "favicon" ? saved.favicon : saved.light;
+
+  const copyAlias = async (slot: BrandSlot) => {
+    try {
+      await navigator.clipboard.writeText(`${window.location.origin}${brandAliasPath(slot)}`);
+      setCopiedSlot(slot);
+      toast("已复制固定地址", "ok");
+      window.setTimeout(() => setCopiedSlot((cur) => (cur === slot ? null : cur)), 1500);
+    } catch {
+      toast("复制失败，请手动复制");
+    }
+  };
+
   const renderSlot = (slot: BrandSlot, label: string, swatch: "light" | "dark" | "neutral", compact?: boolean) => {
     const draft = slotDraft(slot);
     const preview = previewOf(draft);
@@ -216,14 +251,31 @@ export default function BrandSeoPanel({
       <div key={slot} className={`admin-brand-asset${compact ? " is-compact" : ""}`}>
         <div className={`admin-brand-swatch ${swatchClass}`}>
           {preview ? (
+            // 预览槽（≤56px 高，宽标可能更宽）：本站图走 160/384 密度变体
             // eslint-disable-next-line @next/next/no-img-element
-            <img src={preview} alt="" />
+            <img
+              src={isOwnImage(preview) ? variantURL(preview, pickVariantWidth(384)) : preview}
+              srcSet={isOwnImage(preview) ? densitySrcSet(preview, 384) : undefined}
+              alt=""
+            />
           ) : (
             <span>未设置</span>
           )}
         </div>
         <div className="admin-brand-asset-meta">
           <span className="admin-brand-asset-label">{label}</span>
+          {savedOf(slot) ? (
+            <button
+              type="button"
+              className="admin-brand-alias"
+              title="点击复制固定地址（换图不变链，友链引用请用此地址）"
+              onClick={() => void copyAlias(slot)}
+            >
+              <Link2 size={12} aria-hidden />
+              <span className="admin-brand-alias-url">{brandAliasPath(slot)}</span>
+              {copiedSlot === slot ? <Check size={12} aria-hidden /> : null}
+            </button>
+          ) : null}
           <div className="admin-brand-asset-actions">
             <label className="btn btn-line btn-sm cursor-pointer">
               <ImagePlus size={14} /> 上传
@@ -242,7 +294,14 @@ export default function BrandSeoPanel({
                     toast(err);
                     return;
                   }
-                  replaceFile(slot, file);
+                  // SVG / ICO 无需裁剪，直接走原流程
+                  const isVector = file.name.toLowerCase().endsWith(".svg");
+                  const isIco = file.name.toLowerCase().endsWith(".ico");
+                  if (isVector || isIco) {
+                    replaceFile(slot, file);
+                    return;
+                  }
+                  openCrop(slot, file, "");
                 }}
               />
             </label>
@@ -383,11 +442,50 @@ export default function BrandSeoPanel({
         onClose={() => setPicker(null)}
         onPick={(item) => {
           if (!picker) return;
-          const [prev, set] = drafts[picker];
-          if (prev.blob) URL.revokeObjectURL(prev.blob);
-          set({ ...prev, file: null, blob: "", mediaId: item.id, mediaUrl: item.url });
+          const slot = picker;
+          setPicker(null);
+          // 已是品牌目录的历史图（含裁剪产物）：直接引用，不再复制
+          const brandURL = normalizeBrandURL(slot, item.url);
+          if (brandURL) {
+            const [prev, set] = drafts[slot];
+            if (prev.blob) URL.revokeObjectURL(prev.blob);
+            set({ committed: brandURL, file: null, blob: "", mediaId: null, mediaUrl: "" });
+            return;
+          }
+          const lower = item.url.toLowerCase();
+          const isVector = lower.endsWith(".svg");
+          const isIco = lower.endsWith(".ico");
+          // SVG / ICO 不可裁剪，复制一份进品牌目录后引用
+          if ((isVector || isIco) && item.attachmentId != null) {
+            const [prev, set] = drafts[slot];
+            if (prev.blob) URL.revokeObjectURL(prev.blob);
+            set({ ...prev, file: null, blob: "", mediaId: item.attachmentId, mediaUrl: item.url });
+            return;
+          }
+          openCrop(slot, null, item.url);
         }}
       />
+      {cropSlot ? (
+        <BrandCropModal
+          open
+          slot={cropSlot}
+          seedFile={cropSeedFile}
+          seedUrl={cropSeedUrl}
+          onClose={closeCrop}
+          onSeedConsumed={() => {
+            setCropSeedFile(null);
+            setCropSeedUrl("");
+          }}
+          onCropped={(url) => {
+            const [, set] = drafts[cropSlot];
+            set((prev) => {
+              if (prev.blob) URL.revokeObjectURL(prev.blob);
+              return { committed: url, file: null, blob: "", mediaId: null, mediaUrl: "" };
+            });
+            closeCrop();
+          }}
+        />
+      ) : null}
     </AdminSettingsGroup>
   );
 }