fix: Persian duplicate-value errors; admin panel favicon uses the project logo

- PrismaExceptionFilter returned "Unique constraint failed on: mobile" in
  English for a duplicate. It now answers in Persian, naming the field
  (mobile, national code, member code, order number), with a safe generic
  fallback. Covered by a unit test.
- The admin panel still shipped the old "NZ" favicon. favicon.png/.ico are now
  generated from the project logo (the same one the user apps use), in both
  public/ and dist/, and the links carry ?v=2 so browsers drop the cached icon.
- Rebuilt apps/api/release/app.js.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/admin-panel/dist/index.html

@@ -1,17 +1,17 @@
-<!doctype html>
-<html lang="fa" dir="rtl">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="icon" type="image/png" href="/favicon.png" />
-    <title>تهران تاج — پنل مدیریت</title>
+<!doctype html>
+<html lang="fa" dir="rtl">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="icon" type="image/png" href="/favicon.png?v=2" /><link rel="shortcut icon" href="/favicon.ico?v=2" />
+    <title>تهران تاج — پنل مدیریت</title>
     <script type="module" crossorigin src="/assets/index-DWCzDlmr.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-DL8RxBUI.css">
-  </head>
-  <body>
-    <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>
+  </head>
+  <body>
+    <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>

apps/admin-panel/index.html

@@ -3,7 +3,8 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="icon" type="image/png" href="/favicon.png" />
+    <link rel="icon" type="image/png" href="/favicon.png?v=2" />
+    <link rel="shortcut icon" href="/favicon.ico?v=2" />
     <title>%BRAND_TITLE%</title>
   </head>
   <body>