admin-panel: build into the folder the Docker image actually serves

The Dockerfile does `COPY dist /usr/share/nginx/html` and nginx serves that
folder's root, but vite's outDir was 'dist/export' (carried over from legacy's
vue.config.js). So the deployed root kept serving whatever index.html had been
committed at dist/ — a stale pre-port prototype build (lang="en", title
"Gold Bank — Admin Panel", no ant-design-vue at all, committed 2026-09-10 in
cea3b80). That artifact, not the current source, renders as an unstyled stack
of bullets and bare tables.

outDir is now 'dist' (and 'branchDist'), matching what the image serves and
matching apps/user-app's convention.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/admin-panel/dist/index.html

@@ -1,13 +1,16 @@
 <!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>
-    <script type="module" crossorigin src="/assets/index-B84ZE15H.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-CsChEyRN.css">
+    <title>هنزاگلد — پنل مدیریت</title>
+    <script type="module" crossorigin src="/admin/assets/index-C4VtVyHl.js"></script>
+    <link rel="stylesheet" crossorigin href="/admin/assets/index-CYR6yEty.css">
   </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>␍
   </body>
 </html>