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/[id]/page.tsx

@@ -0,0 +1,94 @@
+import type { Metadata } from "next";
+import { notFound, redirect } from "next/navigation";
+import { cookies } from "next/headers";
+import { authCookieHeader } from "@/lib/cookies";
+import { getMeCached } from "@/lib/serverData";
+import { fetchChatRoom, fetchChatMessages, fetchChatRooms } from "@/lib/api";
+import ChatShell from "../ChatShell";
+import ChatRoomClient from "./ChatRoomClient";
+
+interface PageProps {
+  params: Promise<{ id: string }>;
+}
+
+export async function generateMetadata({ params }: PageProps): Promise<Metadata> {
+  const { id } = await params;
+  try {
+    const { room } = await fetchChatRoom(id, authCookieHeader(await cookies()));
+    const title =
+      room.room_type === "direct"
+        ? room.peer?.nickname || room.peer?.username || room.name || "私聊"
+        : room.name;
+    return { title: `消息 · ${title}` };
+  } catch {
+    return { title: "会话不存在" };
+  }
+}
+
+export default async function ChatRoomPage({ params }: PageProps) {
+  const { id } = await params;
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user) {
+    redirect(`/login?redirect=${encodeURIComponent(`/chat/${id}`)}`);
+  }
+
+  let rooms: Awaited<ReturnType<typeof fetchChatRooms>>["rooms"] = [];
+  try {
+    const data = await fetchChatRooms(1, 50, "", cookie, "joined");
+    rooms = data.rooms || [];
+  } catch {
+    rooms = [];
+  }
+
+  let room: Awaited<ReturnType<typeof fetchChatRoom>>["room"];
+  try {
+    ({ room } = await fetchChatRoom(id, cookie));
+  } catch {
+    notFound();
+  }
+
+  let initialMessages: Awaited<ReturnType<typeof fetchChatMessages>> = {
+    messages: [],
+    has_more: false,
+  };
+  if (room.joined) {
+    try {
+      initialMessages = await fetchChatMessages(id, 0, 30, cookie);
+    } catch {
+      // 客户端兜底
+    }
+  }
+
+  const displayName =
+    room.room_type === "direct"
+      ? room.peer?.nickname || room.peer?.username || room.name || "私聊"
+      : room.name;
+
+  return (
+    <div className="max-w-6xl mx-auto">
+      <ChatShell meId={me.user.id} initialRooms={rooms} activeRoomId={room.id}>
+        <ChatRoomClient
+          roomId={room.id}
+          roomName={displayName}
+          roomDescription={room.description}
+          ownerId={room.owner_id}
+          memberCount={room.member_count}
+          myRole={room.my_role}
+          joined={room.joined}
+          isPrivate={room.is_private}
+          isDefault={room.is_default}
+          roomType={room.room_type || "group"}
+          peer={room.peer || null}
+          meId={me.user.id}
+          meRole={me.user.role}
+          meName={me.user.nickname || me.user.username}
+          meAvatar={me.user.avatar || ""}
+          initialMessages={initialMessages.messages}
+          initialHasMore={initialMessages.has_more}
+          embedded
+        />
+      </ChatShell>
+    </div>
+  );
+}