补齐论坛核心能力：讨论锁定、发帖本地草稿、标签精确筛选，以及私信与通知分流。

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

handler/api.go

@@ -198,6 +198,27 @@ func (h *Handlers) APIAdminLockPost(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": msg, "edit_locked": req.Locked})
 }
 
+// APIAdminCommentsLockPost 锁定/解锁讨论（禁止新评论）
+func (h *Handlers) APIAdminCommentsLockPost(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
+	var req struct {
+		Locked bool `json:"locked"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "参数错误"})
+		return
+	}
+	if err := h.Post.SetCommentsLocked(uint(id), req.Locked); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	msg := "已开放讨论"
+	if req.Locked {
+		msg = "已锁定讨论"
+	}
+	c.JSON(http.StatusOK, gin.H{"message": msg, "comments_locked": req.Locked})
+}
+
 // APIAdminPinPost 全局置顶/取消全局置顶（JSON）
 func (h *Handlers) APIAdminPinPost(c *gin.Context) {
 	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
@@ -911,6 +932,7 @@ func (h *Handlers) APIPosts(c *gin.Context) {
 	boardID, _ := strconv.ParseUint(c.Query("board_id"), 10, 64)
 	userID, _ := strconv.ParseUint(c.Query("user_id"), 10, 64)
 	keyword := c.Query("keyword")
+	tag := strings.TrimSpace(c.Query("tag"))
 
 	q := service.PostListQuery{
 		BoardID:       uint(boardID),
@@ -918,6 +940,7 @@ func (h *Handlers) APIPosts(c *gin.Context) {
 		Page:          page,
 		Size:          size,
 		Keyword:       keyword,
+		Tag:           tag,
 		Sort:          c.DefaultQuery("sort", "latest"),
 		ViewerID:      h.currentUserID(c),
 		ViewerIsAdmin: h.isAdmin(c),

handler/message.go

@@ -94,14 +94,46 @@ func (h *Handlers) APIMarkConversationRead(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "已标为已读"})
 }
 
-// APIMessageUnreadCount 未读私信数
+// APIMessageUnreadCount 未读私信数（含私信/通知分项）
 func (h *Handlers) APIMessageUnreadCount(c *gin.Context) {
-	n, err := h.Message.UnreadCount(h.currentUserID(c))
+	total, dm, notify, err := h.Message.UnreadCounts(h.currentUserID(c))
 	if err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"count": n})
+	c.JSON(http.StatusOK, gin.H{
+		"count":        total,
+		"dm_count":     dm,
+		"notify_count": notify,
+	})
+}
+
+// APIMessageNotifications 系统通知列表
+func (h *Handlers) APIMessageNotifications(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	size, _ := strconv.Atoi(c.DefaultQuery("size", "30"))
+	kind := c.Query("kind")
+	uid := h.currentUserID(c)
+	list, total, err := h.Message.ListNotifications(uid, page, size, kind)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"notifications": list,
+		"total":         total,
+		"page":          page,
+		"kind":          kind,
+	})
+}
+
+// APIMarkNotificationsRead 系统通知全部已读
+func (h *Handlers) APIMarkNotificationsRead(c *gin.Context) {
+	if err := h.Message.MarkNotificationsRead(h.currentUserID(c)); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "通知已全部标为已读"})
 }
 
 // APISendMessage 发送私信