feat: 管理端板块管理与旧版数据导入，补充部署运营文档

- 新增管理端板块管理页面与后端接口（admin_board）
- 新增旧版数据导入：legacyimport 服务、导入面板、importusers 命令行工具
- 聊天用户卡片、板块图标等 UI 组件与界面优化
- 补充 about/公告/1Panel 部署等文档
- gitignore 排除 dist/ 构建产物与 .agents/ 本地工具目录

backend/handler/setting.go

@@ -23,6 +23,7 @@ func (h *Handlers) PublicSettings(c *gin.Context) {
 type updateSettingsRequest 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"`
@@ -62,6 +63,7 @@ func settingsPayload(saved service.PublicSiteSettings) gin.H {
 	return gin.H{
 		"accent":                 saved.Accent,
 		"trust_reviewed_publish": saved.TrustReviewedPublish,
+		"publish_without_review": saved.PublishWithoutReview,
 		"site_name":              saved.SiteName,
 		"site_description":       saved.SiteDescription,
 		"allow_register":         saved.AllowRegister,
@@ -99,7 +101,7 @@ func settingsPayload(saved service.PublicSiteSettings) gin.H {
 }
 
 func (req *updateSettingsRequest) hasAny() bool {
-	return req.Accent != nil || req.TrustReviewedPublish != nil || req.SiteName != nil ||
+	return req.Accent != nil || req.TrustReviewedPublish != nil || req.PublishWithoutReview != nil || req.SiteName != nil ||
 		req.SiteDescription != nil || req.AllowRegister != nil || req.AllowComments != nil ||
 		req.CommentsRequireLogin != nil || req.AllowMessages != nil || req.PostCooldownHours != nil || req.CodeBlockAutoFold != nil ||
 		req.CodeBlockFoldLines != nil || req.UIAnimations != nil || req.AnimCodeFold != nil ||
@@ -156,6 +158,12 @@ func (h *Handlers) UpdateSettings(c *gin.Context) {
 			return
 		}
 	}
+	if req.PublishWithoutReview != nil {
+		if err := h.Setting.SetPublishWithoutReview(*req.PublishWithoutReview); err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
+			return
+		}
+	}
 	if req.SiteName != nil {
 		if err := h.Setting.SetSiteName(*req.SiteName); err != nil {
 			if errors.Is(err, service.ErrInvalidSiteSetting) {