feat: Complete Phase 2 notification system implementation

- Implement messaging system factory pattern
- Fix all transaction notification blockers
- Complete listener logic for all notification types

src/common/modules/notification/notification.module.ts

@@ -11,6 +11,7 @@ import { Notification } from './entities';
 import { NotificationCreatedListener, TransactionNotificationListener } from './listeners';
 import { NotificationsRepository } from './repositories';
 import { FirebaseService, NotificationFactory, NotificationsService, TwilioService } from './services';
+import { MessagingSystemFactory, RedisPubSubMessagingService } from './services/messaging';
 
 @Module({
   imports: [
@@ -34,6 +35,8 @@ import { FirebaseService, NotificationFactory, NotificationsService, TwilioServi
     TwilioService,
     NotificationCreatedListener,
     TransactionNotificationListener,
+    RedisPubSubMessagingService,
+    MessagingSystemFactory,
   ],
   exports: [NotificationsService, NotificationFactory, NotificationCreatedListener],
   controllers: [NotificationsController],