feat(admin): 完善站点设置、内容回收站与后台菜单分组

新增站点设置与内容管理（含已删除恢复/清除），用户页改用独有运营指标，并按概览/内容/成员与经济/站点重组侧栏。

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

frontend/app/admin/content/page.tsx

@@ -0,0 +1,56 @@
+import type { Metadata } from "next";
+import { cookies } from "next/headers";
+import { authCookieHeader } from "@/lib/cookies";
+import {
+  fetchAdminContentCounts,
+  fetchAdminContentPosts,
+  type AdminContentPost,
+} from "@/lib/api";
+import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
+import { canModerateAny, isSuperOrOwner } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+import ContentAdmin from "./ContentAdmin";
+
+export const metadata: Metadata = {
+  title: "内容管理",
+};
+
+export default async function AdminContentPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !canModerateAny(me.user)) {
+    return <Forbidden text="你所在的角色没有内容管理权限，或尚未被授权任何板块。" />;
+  }
+
+  let initialPosts: AdminContentPost[] = [];
+  let initialTotal = 0;
+  let initError = "";
+  const [postsSettled, counts] = await Promise.all([
+    fetchAdminContentPosts(1, "live", cookie || undefined)
+      .then((res) => ({ ok: true as const, res }))
+      .catch((e) => ({
+        ok: false as const,
+        error: e instanceof Error ? e.message : "获取内容列表失败",
+      })),
+    fetchAdminContentCounts(cookie || undefined),
+  ]);
+  if (postsSettled.ok) {
+    initialPosts = postsSettled.res.posts;
+    initialTotal = postsSettled.res.total;
+  } else {
+    initError = postsSettled.error;
+  }
+
+  const settings = await getPublicSettingsCached();
+
+  return (
+    <ContentAdmin
+      initialPosts={initialPosts}
+      initialPostsTotal={initialTotal}
+      initialCounts={counts}
+      initError={initError}
+      canConfigureSettings={isSuperOrOwner(me.user.role)}
+      initialSettings={settings}
+    />
+  );
+}