feat(notifications): add multi-channel notification module with Email, FCM, templates, and event listeners

- Domain: NotificationLog/NotificationPreference entities, repositories, channel value object
- Infrastructure: EmailService (nodemailer/SMTP), FcmService (firebase-admin), TemplateService (Handlebars)
- Application: SendNotification CQRS command, UserRegistered + AgentVerified event listeners
- Presentation: NotificationsController with history, preferences, and templates endpoints
- Prisma: NotificationLog and NotificationPreference models with proper indexes
- Templates: Vietnamese notification templates for user.registered, agent.verified, listing.approved, inquiry.received, password.reset

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

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

@@ -0,0 +1,48 @@
+import { Module } from '@nestjs/common';
+import { CqrsModule } from '@nestjs/cqrs';
+
+// Domain
+import { NOTIFICATION_REPOSITORY } from './domain/repositories/notification.repository';
+import { NOTIFICATION_PREFERENCE_REPOSITORY } from './domain/repositories/notification-preference.repository';
+
+// Infrastructure
+import { PrismaNotificationRepository } from './infrastructure/repositories/prisma-notification.repository';
+import { PrismaNotificationPreferenceRepository } from './infrastructure/repositories/prisma-notification-preference.repository';
+import { EmailService } from './infrastructure/services/email.service';
+import { FcmService } from './infrastructure/services/fcm.service';
+import { TemplateService } from './infrastructure/services/template.service';
+
+// Application
+import { SendNotificationHandler } from './application/commands/send-notification/send-notification.handler';
+import { UserRegisteredListener } from './application/listeners/user-registered.listener';
+import { AgentVerifiedListener } from './application/listeners/agent-verified.listener';
+
+// Presentation
+import { NotificationsController } from './presentation/controllers/notifications.controller';
+
+const CommandHandlers = [SendNotificationHandler];
+
+const EventListeners = [UserRegisteredListener, AgentVerifiedListener];
+
+@Module({
+  imports: [CqrsModule],
+  controllers: [NotificationsController],
+  providers: [
+    // Repositories
+    { provide: NOTIFICATION_REPOSITORY, useClass: PrismaNotificationRepository },
+    { provide: NOTIFICATION_PREFERENCE_REPOSITORY, useClass: PrismaNotificationPreferenceRepository },
+
+    // Services
+    EmailService,
+    FcmService,
+    TemplateService,
+
+    // CQRS
+    ...CommandHandlers,
+
+    // Event Listeners
+    ...EventListeners,
+  ],
+  exports: [EmailService, FcmService, TemplateService],
+})
+export class NotificationsModule {}