feat(payments): add Order & Escrow entities with CQRS commands, Prisma schema

- Add Order entity with lifecycle (pending → paid → completed/cancelled/refunded)
- Add Escrow entity with hold/release/dispute flow for secure transactions
- Add PlatformFee value object with tiered commission calculation
- Implement CQRS: CreateOrder, CancelOrder, HoldEscrow, ReleaseEscrow commands
- Add GetOrderStatus query handler
- Add OrdersController with REST endpoints and DTOs
- Add Prisma models for Order, Escrow, EscrowStatusHistory
- Add domain event classes for order and escrow state changes
- Add unit tests for Order, Escrow entities and PlatformFee VO
- Update PROJECT_TRACKER to Wave 14 status

Co-Authored-By: Claude Opus 4 (1M context) <noreply@anthropic.com>

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

@@ -1,6 +1,24 @@
 export { PaymentsModule } from './payments.module';
+
+// Repositories
+export { ESCROW_REPOSITORY, type IEscrowRepository } from './domain/repositories/escrow.repository';
+export { ORDER_REPOSITORY, type IOrderRepository } from './domain/repositories/order.repository';
 export { PAYMENT_REPOSITORY, type IPaymentRepository } from './domain/repositories/payment.repository';
+
+// Gateway
 export { PAYMENT_GATEWAY_FACTORY, type IPaymentGatewayFactory } from './infrastructure/services/payment-gateway.interface';
+
+// Domain Events — Payment
 export { PaymentCompletedEvent } from './domain/events/payment-completed.event';
 export { PaymentFailedEvent } from './domain/events/payment-failed.event';
 export { PaymentRefundedEvent } from './domain/events/payment-refunded.event';
+
+// Domain Events — Order
+export { OrderCreatedEvent } from './domain/events/order-created.event';
+export { OrderCancelledEvent } from './domain/events/order-cancelled.event';
+export { OrderPaidEvent } from './domain/events/order-paid.event';
+
+// Domain Events — Escrow
+export { EscrowDisputedEvent } from './domain/events/escrow-disputed.event';
+export { EscrowHeldEvent } from './domain/events/escrow-held.event';
+export { EscrowReleasedEvent } from './domain/events/escrow-released.event';