完善站点运营设置：分路由管理、登录可见评论、邮件模板内联与关闭注册 SSR。

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

frontend/app/admin/settings/layout.tsx

@@ -0,0 +1,15 @@
+import { cookies } from "next/headers";
+import { authCookieHeader } from "@/lib/cookies";
+import { getMeCached } from "@/lib/serverData";
+import { isSuperOrOwner } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+import SettingsShell from "./SettingsShell";
+
+export default async function SettingsLayout({ children }: { children: React.ReactNode }) {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !isSuperOrOwner(me.user.role)) {
+    return <Forbidden text="站点设置仅超级管理员和站长可操作。" />;
+  }
+  return <SettingsShell>{children}</SettingsShell>;
+}