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/agents/application/listeners/review-events.listener.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { type CommandBus } from '@nestjs/cqrs';
 import { OnEvent } from '@nestjs/event-emitter';
-import { type LoggerService } from '@modules/shared';
+import { LoggerService } from '@modules/shared';
 import { RecalculateQualityScoreCommand } from '../commands/recalculate-quality-score/recalculate-quality-score.command';
 
 @Injectable()

apps/api/src/modules/agents/infrastructure/repositories/prisma-agent.repository.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@nestjs/common';
-import { type PrismaService } from '@modules/shared';
+import { PrismaService } from '@modules/shared';
 import { AgentEntity } from '../../domain/entities/agent.entity';
 import {
   type AgentDashboardData,