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>

frontend/components/PostRow.tsx

@@ -54,6 +54,7 @@ export default function PostRow({
         <div className="flex items-center gap-2 min-w-0">
           {post.pinned > 0 && <span className="badge-pin shrink-0">置顶</span>}
           {post.recommended && <span className="badge-rec shrink-0">推荐</span>}
+          {post.status === "pending" && <span className="badge-pending shrink-0">待审</span>}
           <Link
             href={`/post/${post.id}`}
             className="stretch-link min-w-0 flex-1"