feat: implement QR code scan login system with admin control

- Add scan login service with Redis-based token management
- Add scan login API routes for token generation and validation
- Add QRCodeLogin component for PC-side QR code display
- Add EntryQRCode component for mass login scenarios
- Add ScanLoginView for mobile-side login form
- Add localStorage persistence for user identity
- Add logout functionality to mobile client
- Add auto-redirect for logged-in users
- Add admin console control for QR code display on big screen
- Add socket event forwarding from admin to screen display

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/client-mobile/src/router/index.ts

@@ -23,6 +23,11 @@ const router = createRouter({
       name: 'profile',
       component: () => import('../views/ProfileView.vue'),
     },
+    {
+      path: '/scan-login',
+      name: 'scan-login',
+      component: () => import('../views/ScanLoginView.vue'),
+    },
   ],
 });