feat: complete admin panel and backend admin api migration

apps/admin-panel/index.html

@@ -1,12 +1,15 @@
 <!doctype html>
-<html lang="en">
+<html lang="fa" dir="rtl">
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Gold Bank — Admin Panel</title>
+    <title>هنزاگلد — پنل مدیریت</title>
   </head>
   <body>
-    <div id="app"></div>
+    <div id="app">
+      <!-- Removed by router.afterEach, ported from legacy henza_admin/src/router.js:147-153 -->
+      <div id="loading-bg"></div>
+    </div>
     <script type="module" src="/src/main.ts"></script>
   </body>
 </html>