feat: add notification events handling and MQTT integration

- Implemented notification event publishing with a new NotificationEventPublisher interface.
- Created a noopNotificationEventPublisher for testing purposes.
- Added functionality to publish notification created events via MQTT.
- Introduced a new stream event publisher for handling job logs and updates.
- Added database migration for popup_ads table.
- Created tests for notification events and popup ads functionality.
- Established MQTT connection and publishing helpers for event messages.

internal/service/service_payments.go

@@ -141,6 +141,7 @@ func (s *paymentsAppService) TopupWallet(ctx context.Context, req *appv1.TopupWa
 		s.logger.Error("Failed to top up wallet", "error", err)
 		return nil, status.Error(codes.Internal, "Failed to top up wallet")
 	}
+	s.publishNotificationCreated(ctx, notification)
 
 	balance, err := s.billingRepository.GetWalletBalance(ctx, result.UserID)
 	if err != nil {