feat: modo multidispositivo con Nearby Connections

- ServicioNearby completo: P2P_STAR, auto-accept, protocolo mensajes
- PantallaLobbyHost: QR code + lista jugadores tiempo real
- PantallaUnirse: escaneo QR + conexión + sala espera
- Protocolo MensajeP2P: salaInfo, partidaInicio, fase, voto, resultado, fin
- Manejo desconexiones jugador/host
- l10n: nuevas keys es/en
- Version bump 1.1.0+5

lib/l10n/generated/app_localizations_en.dart

@@ -471,4 +471,45 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get licenses => 'Licenses';
+
+  @override
+  String get scanToJoin => 'Scan QR to join';
+
+  @override
+  String get connectedPlayers => 'Connected players';
+
+  @override
+  String get waitingForPlayers => 'Waiting for players...';
+
+  @override
+  String needMorePlayers(int count) {
+    return 'Need $count more players';
+  }
+
+  @override
+  String get starting => 'Starting...';
+
+  @override
+  String get enterNameAndScan => 'Enter your name and scan the host\'s QR';
+
+  @override
+  String get yourName => 'Your name';
+
+  @override
+  String get nameRequired => 'Enter your name';
+
+  @override
+  String get connectingTo => 'Connecting to';
+
+  @override
+  String get scanQR => 'Scan QR';
+
+  @override
+  String get scanHostQR => 'Point at the host\'s QR code';
+
+  @override
+  String get connectedWaiting => 'Connected!';
+
+  @override
+  String get waitingForHost => 'Waiting for the host to start the game...';
 }