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-screen/src/stores/display.ts

@@ -32,6 +32,9 @@ export const useDisplayStore = defineStore('display', () => {
     avatar?: string;
   } | null>(null);
 
+  // QR Code display state (controlled by admin)
+  const showEntryQR = ref(false);
+
   // Computed
   const connectionStatus = computed(() => {
     if (isConnected.value) return 'connected';
@@ -131,6 +134,17 @@ export const useDisplayStore = defineStore('display', () => {
       }
     });
 
+    // QR Code display control events
+    socketInstance.on('display:show_entry_qr' as any, () => {
+      console.log('[Screen] Show entry QR code');
+      showEntryQR.value = true;
+    });
+
+    socketInstance.on('display:hide_qr' as any, () => {
+      console.log('[Screen] Hide QR code');
+      showEntryQR.value = false;
+    });
+
     socket.value = socketInstance as GalaSocket;
   }
 
@@ -169,6 +183,7 @@ export const useDisplayStore = defineStore('display', () => {
     isDrawing,
     currentPrize,
     currentWinner,
+    showEntryQR,
 
     // Computed
     connectionStatus,