后台管理系统基础框架：侧边栏布局、9 个页面模块、共享类型和 API 客户端

frontend/app/ops/subscriptions/page.tsx

@@ -0,0 +1,10 @@
+import type { Metadata } from "next";
+import { requireOpsAdmin } from "@/lib/ops-admin";
+import { SubscriptionsPageClient } from "@/components/ops/subscriptions/SubscriptionsPageClient";
+
+export const metadata: Metadata = { title: "订阅操作 — PolyWeather Ops" };
+
+export default async function SubscriptionsPage() {
+  await requireOpsAdmin("/ops/subscriptions");
+  return <SubscriptionsPageClient />;
+}