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>
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