feat(push): implement system notification and push framework

frontend/app/(main)/admin/push/page.tsx

@@ -0,0 +1,14 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+import type {Metadata} from "next";
+import {PushNotificationManager} from "@/components/common/admin/push-notification";
+
+export const metadata: Metadata = {
+  title: "通知推送 - Wavelet Admin",
+  description: "系统通知多渠道推送与事件管理控制台",
+};
+
+export default function PushAdminPage() {
+  return <PushNotificationManager />;
+}