feat(api): improve notifications, reviews, search, and subscriptions modules

- Add listing-sold event listener with spec for notifications
- Add review-deleted event listener with spec for reviews
- Improve search handlers with proper Typesense client injection
- Improve subscription handlers with ConfigService and quota tracking

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/notifications/index.ts

@@ -1 +1,2 @@
 export { NotificationsModule } from './notifications.module';
+export { SendNotificationCommand } from './application/commands/send-notification/send-notification.command';