feat: implement Redis-backed Socket.io adapter and user presence service for cross-instance communication

src/main.ts

@@ -8,6 +8,7 @@ import cookieParser from 'cookie-parser';
 import { AppModule } from './app.module';
 import { AllExceptionsFilter } from './common/filters';
 import { TransformInterceptor } from './common/interceptors';
+import { RedisIoAdapter } from './common/adapters/redis-io.adapter';
 
 async function bootstrap() {
   const logger = new Logger('Bootstrap');
@@ -101,6 +102,11 @@ async function bootstrap() {
     logger.log(`Swagger documentation available at http://localhost:${port}/api/docs`);
   }
 
+  // Socket.IO Redis adapter for cross-instance event broadcasting
+  const redisIoAdapter = new RedisIoAdapter(app, configService);
+  await redisIoAdapter.connectToRedis();
+  app.useWebSocketAdapter(redisIoAdapter);
+
   await app.listen(port);
   logger.log(`Application is running on: http://localhost:${port}`);
   logger.log(`Environment: ${appEnv}`);