feat: Implement real-time messaging module with REST API endpoints and WebSocket gateway.

src/app.module.ts

@@ -15,6 +15,7 @@ import { AgentsModule } from './agents';
 import { UploadModule } from './upload';
 import { ProfileFieldsModule } from './profile-fields';
 import { ConnectionRequestsModule } from './connection-requests';
+import { MessagesModule } from './messages';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 
@@ -53,6 +54,7 @@ import { AppService } from './app.service';
     UploadModule,
     ProfileFieldsModule,
     ConnectionRequestsModule,
+    MessagesModule,
   ],
   controllers: [AppController],
   providers: [