Update WBBR frontend template collection

app/admin/page.tsx

@@ -0,0 +1,7 @@
+import Link from "next/link";
+import AdminApp from "../AdminApp";
+import styles from "./AdminPage.module.css";
+
+export default function AdminTemplatePage() {
+  return <div><AdminApp /><Link className={styles.backToHub} href="/">← 模板中心</Link></div>;
+}