feat: add pricing checkout flow, MFA type fixes, and Wave 13 audit docs

- Pricing page: enhanced with checkout modal integration, plan
  comparison table, and subscription funnel
- Payment return page: new VNPay/MoMo callback handler
- Subscription components: new checkout-modal with payment method
  selection (VNPay, MoMo, ZaloPay)
- API modules: type-safe PII encryption, improved error handling in
  MFA/auth/payments/analytics/search/notifications modules
- Audit docs: comprehensive Wave 13 platform assessment, pricing
  audit, production readiness checklist
- Updated PROJECT_TRACKER with Wave 13 status

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

apps/api/src/modules/notifications/presentation/controllers/notifications.controller.ts

@@ -20,7 +20,7 @@ import {
   NOTIFICATION_PREFERENCE_REPOSITORY,
   type INotificationPreferenceRepository,
 } from '../../domain';
-import { type TemplateService } from '../../infrastructure/services/template.service';
+import { TemplateService } from '../../infrastructure/services/template.service';
 
 class UpdatePreferenceDto {
   @ApiProperty({ enum: PrismaChannel, description: 'Notification channel' })