fix: auto-logout on 401 so stale tokens don't leave frontend in broken state

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

frontend/app.js

@@ -150,9 +150,7 @@ createApp({
       this.users = [];
       this.status = '';
       this.error = '';
-      this.view = 'byAud';
-      // опционально: редирект на страницу логина
-      // window.location.href = '/login';
+      window.location.href = '/login';
     },
     authHeaders() {
       const h = {};
@@ -162,6 +160,10 @@ createApp({
     async fetchAuth(url, options = {}) {
       const opt = { ...options, headers: { ...(options.headers||{}), ...this.authHeaders() } };
       const res = await fetch(url, opt);
+      if (res.status === 401) {
+        this.logout();
+        return;
+      }
       if (!res.ok) {
         const text = await res.text();
         throw new Error(`HTTP ${res.status}: ${text}`);