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/post.go

@@ -20,6 +20,15 @@ func (h *Handlers) Posts(c *gin.Context) {
 	keyword := c.Query("keyword")
 	recommended := c.Query("recommended") == "true"
 
+	var viewerID uint
+	var actor *service.Actor
+	if claims := middleware.CurrentUser(c); claims != nil {
+		viewerID = claims.ID
+		if a, err := h.Auth.LoadActor(claims.ID); err == nil {
+			actor = a
+		}
+	}
+
 	items, total, err := h.Post.List(service.PostListQuery{
 		BoardID:     uint(boardID),
 		Page:        page,
@@ -27,6 +36,8 @@ func (h *Handlers) Posts(c *gin.Context) {
 		Sort:        sort,
 		Keyword:     keyword,
 		Recommended: recommended,
+		ViewerID:    viewerID,
+		Actor:       actor,
 	})
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
@@ -109,6 +120,11 @@ func (h *Handlers) CreatePost(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
+	if post.Status == model.ContentStatusPublished {
+		h.broadcastFeedChanged("post", post.ID, post.BoardID, claims.ID)
+	} else if post.Status == model.ContentStatusPending {
+		h.notifyPendingReview(post.BoardID, claims.ID, post.ID, 0, "有新帖待审核："+post.Title)
+	}
 	c.JSON(http.StatusOK, gin.H{"post": post})
 }