feat: 实现完整的板块级RBAC内容审核系统

- 新增站长/超级管理员/管理员/板块管理员四级角色体系
- 实现实时权限快照加载与细粒度权限校验
- 新增内容审核队列与前后端页面
- 重构用户权限管理与站点管理逻辑
- 新增评论/帖子审核状态与通知推送
- 优化前端权限控制与角色徽章展示
- 修正数据库迁移与默认值问题

frontend/app/admin/moderation/page.tsx

@@ -0,0 +1,43 @@
+import type { Metadata } from "next";
+import { cookies } from "next/headers";
+import { authCookieHeader } from "@/lib/cookies";
+import { fetchAdminPendingPosts, type Post } from "@/lib/api";
+import { getMeCached } from "@/lib/serverData";
+import { canModerateAny } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+import ModerationAdmin from "./ModerationAdmin";
+
+export const metadata: Metadata = {
+  title: "内容审核",
+};
+
+// 鉴权由 app/admin/layout.tsx 统一承担（RequireStaff + 板块隔离由后端兜底）；
+// 帖子待审队列首屏 SSR 直出，评论队列由客户端进入时拉取
+export default async function ModerationPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+
+  // 板块管理员及以上且（对板块管理员）拥有授权板块
+  if (!me.user || !canModerateAny(me.user)) {
+    return <Forbidden text="你所在的角色没有内容审核权限，或尚未被授权任何板块。" />;
+  }
+
+  let initialPosts: Post[] = [];
+  let initialTotal = 0;
+  let initError = "";
+  try {
+    const res = await fetchAdminPendingPosts(1, cookie || undefined);
+    initialPosts = res.posts;
+    initialTotal = res.total;
+  } catch (e) {
+    initError = e instanceof Error ? e.message : "获取待审核内容失败";
+  }
+
+  return (
+    <ModerationAdmin
+      initialPosts={initialPosts}
+      initialPostsTotal={initialTotal}
+      initError={initError}
+    />
+  );
+}