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/app/chat/page.tsx

@@ -0,0 +1,34 @@
+import { redirect } from "next/navigation";
+import { cookies } from "next/headers";
+import type { Metadata } from "next";
+import { authCookieHeader } from "@/lib/cookies";
+import { getMeCached } from "@/lib/serverData";
+import { fetchChatRooms } from "@/lib/api";
+import ChatShell from "./ChatShell";
+
+export const metadata: Metadata = {
+  title: "消息",
+  description: "私聊与群聊，实时交流。",
+};
+
+export default async function ChatListPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user) {
+    redirect(`/login?redirect=${encodeURIComponent("/chat")}`);
+  }
+
+  let rooms: Awaited<ReturnType<typeof fetchChatRooms>>["rooms"] = [];
+  try {
+    const data = await fetchChatRooms(1, 50, "", cookie, "joined");
+    rooms = data.rooms || [];
+  } catch {
+    rooms = [];
+  }
+
+  return (
+    <div className="max-w-6xl mx-auto">
+      <ChatShell meId={me.user.id} initialRooms={rooms} activeRoomId={null} />
+    </div>
+  );
+}