feat: 实时消息与管理端运营能力

新增群聊/私信与公共 WebSocket 总线，站长用户内容档案，并将通知与待审角标改为推送驱动；同步精简管理仪表盘并修复主题换肤 DOM 冲突。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/handler/handlers.go

@@ -2,12 +2,16 @@ package handler
 
 import (
 	"github.com/freefire/jiang13-bbs/config"
+	"github.com/freefire/jiang13-bbs/model"
+	"github.com/freefire/jiang13-bbs/realtime"
 	"github.com/freefire/jiang13-bbs/service"
+	"github.com/gin-gonic/gin"
 )
 
 // Handlers 聚合所有服务引用
 type Handlers struct {
 	Cfg          *config.Config
+	Hub          *realtime.Hub
 	Auth         *service.AuthService
 	Board        *service.BoardService
 	Post         *service.PostService
@@ -21,4 +25,46 @@ type Handlers struct {
 	Setting      *service.SettingService
 	AdminUser    *service.AdminUserService
 	Moderation   *service.ModerationService
+	Chat         *service.ChatService
+}
+
+// broadcastFeedChanged 帖子流有公开发布内容时全员广播（三期）
+func (h *Handlers) broadcastFeedChanged(kind string, postID, boardID, actorID uint) {
+	if h.Hub == nil {
+		return
+	}
+	h.Hub.BroadcastAll(realtime.Envelope{
+		Type: realtime.EventFeedChanged,
+		Data: gin.H{
+			"kind":     kind,
+			"post_id":  postID,
+			"board_id": boardID,
+			"actor_id": actorID,
+		},
+	})
+}
+
+// notifyPendingReview 待审内容通知该板可审者（WS 红点由 Notification.OnNotifyNew 统一推送）
+func (h *Handlers) notifyPendingReview(boardID, actorID, postID, commentID uint, preview string) {
+	ids, err := h.Auth.ListBoardModeratorIDs(boardID)
+	if err != nil || len(ids) == 0 {
+		return
+	}
+	for _, uid := range ids {
+		if uid == actorID {
+			continue
+		}
+		h.Notification.Create(uid, actorID, model.NotificationTypePendingReview, postID, commentID, preview)
+	}
+	h.broadcastModerationChanged()
+}
+
+// broadcastModerationChanged 通知管理团队待审队列有变化（角标由客户端按权限再拉一次）
+func (h *Handlers) broadcastModerationChanged() {
+	if h.Hub == nil {
+		return
+	}
+	h.Hub.BroadcastRoom(realtime.RoomStaff, realtime.Envelope{
+		Type: realtime.EventModerationChanged,
+	})
 }