feat(admin): 引入 admin.js（总台交互渐进增强基线）

resources/views/admin/layouts/app.blade.php

@@ -98,6 +98,7 @@
         @yield('content')
     </main>
 </div>
+    <script src="/js/admin.js" defer></script>
     <script data-action="topnav-single-open">
         (function(){
             var root = document.querySelector('[data-role="topnav-groups-root"]');