feat(server): add booking, payment, and scheduler modules

Booking: reservation with atomic transactions, cancellation with refund
logic based on cancelHoursLimit (23 tests)
Payment: WeChat Pay integration (mock), order lifecycle, membership
creation on payment callback (13 tests)
Scheduler: cron tasks for slot generation, cleanup, membership expiry (8 tests)
109 total tests passing across 9 test suites

packages/server/src/payment/dto/create-order.dto.ts

@@ -0,0 +1,6 @@
+import { IsUUID } from 'class-validator'
+
+export class CreateOrderDto {
+  @IsUUID()
+  cardTypeId!: string
+}