feat: add local auth billing and usage management

app/settings/page.tsx

@@ -1,9 +1,19 @@
 import { SettingsPanel } from "@/components/settings-panel";
-import { requireAdminUser } from "@/lib/server/auth/current-user";
+import { hasSuperAdminAccess } from "@/lib/auth/permissions";
+import { requireAppSession } from "@/lib/server/auth/current-user";
 
 export const dynamic = "force-dynamic";
 
 export default async function SettingsPage() {
-  await requireAdminUser();
-  return <SettingsPanel />;
+  const session = await requireAppSession();
+  return (
+    <div className="settings-page-stack">
+      {hasSuperAdminAccess(session.user) ? <SettingsPanel /> : (
+        <section className="panel">
+          <h2>系统设置</h2>
+          <p className="muted">系统配置仅由超级管理员维护。</p>
+        </section>
+      )}
+    </div>
+  );
 }