feat: auto music control for lottery phases

- Auto-play lottery music when storm starts
- Auto-play fanfare when winners revealed
- Auto-stop music when lottery completes
- Add EventEmitter to broadcast async state changes

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

packages/server/src/services/admin.service.ts

@@ -1,6 +1,7 @@
 /**
  * Admin Service - Manages system phase, voting control, and lottery state
  */
+import { EventEmitter } from 'events';
 import { redis } from '../config/redis';
 import { logger } from '../utils/logger';
 import { prizeConfigService } from './prize-config.service';
@@ -21,10 +22,11 @@ import { INITIAL_ADMIN_STATE, PRIZE_CONFIG, DEFAULT_PROGRAMS } from '@gala/share
 
 const ADMIN_STATE_KEY = 'gala:admin:state';
 
-class AdminService {
+class AdminService extends EventEmitter {
   private state: AdminState;
 
   constructor() {
+    super();
     this.state = { ...INITIAL_ADMIN_STATE };
   }
 
@@ -372,6 +374,9 @@ class AdminService {
           }
           this.state.lottery.subPhase = 'STORM';
           this.state.lottery.stormStartedAt = Date.now();
+          // Auto-play lottery music
+          this.state.music.isPlaying = true;
+          this.state.music.track = 'lottery';
           break;
 
         case 'stop_reveal':
@@ -382,10 +387,17 @@ class AdminService {
           const winners = this.pickRandomWinners();
           this.state.lottery.subPhase = 'REVEAL';
           this.state.lottery.currentWinners = winners;
-          // After reveal animation, set to COMPLETE
+          // Auto-play fanfare music
+          this.state.music.isPlaying = true;
+          this.state.music.track = 'fanfare';
+          // After reveal animation, set to COMPLETE and stop music
           setTimeout(() => {
             this.state.lottery.subPhase = 'COMPLETE';
+            this.state.music.isPlaying = false;
+            this.state.music.track = 'none';
             this.saveState();
+            // Emit event to broadcast state change
+            this.emit('stateChange', this.getState());
           }, 3000);
           await this.saveState();
           return { success: true, data: { winners } };

packages/server/src/socket/index.ts

@@ -57,6 +57,12 @@ export async function initializeSocket(httpServer: HttpServer): Promise<GalaServ
   // Initialize admin service
   await adminService.initialize();
 
+  // Listen for admin state changes (e.g., from setTimeout callbacks)
+  adminService.on('stateChange', (state) => {
+    logger.info('Admin state changed, broadcasting to all clients');
+    io.to(SOCKET_ROOMS.ALL).emit(SOCKET_EVENTS.ADMIN_STATE_SYNC as any, state);
+  });
+
   // Connection handler
   io.on('connection', handleConnection);