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/vite.config.ts

@@ -64,7 +64,8 @@ export default defineConfig({
     },
   },
   server: {
-    port: 5173,
+    host: '0.0.0.0',
+    port: 5174,
     proxy: {
       '/api': {
         target: 'http://localhost:3000',