fix: branding, 401 logout, and blocked-user message on register page

- Copyright.vue / AuthCopyright.vue: change link from mugweb.ir to madresebanoo.ir
- SelectField.vue: add min-width:0 to prevent flex overflow in narrow layouts
- useRedirectAfterLogin: check roles array (multi-role support) instead of single role
- StudentRegisterPage: show block reason when user's status is blocked
- http.js: only clear session on 401 if a token already existed (login
  form 401 should not trigger logout); clear via authStore so WordPress
  cookie is also cleaned up

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/Copyright.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="copyright">
     <div class="copyright__text">
-      <a href="https://mugweb.ir/" target="_blank" rel="noopener">
+      <a href="https://madresebanoo.ir/" target="_blank" rel="noopener">
         <p class="copyright__en">All Rights Reserved. 2026</p>
         <p class="copyright__fa">تمام حقوق مادی و معنوی این وبسایت محفوظ هست.</p>
       </a>