feat(M05-A): 建立统一支付领域与幂等回调

backend/src/app.ts

@@ -37,6 +37,7 @@ import {
   registerOrderManagementRoutes, type OrderManagementRouteOptions
 } from './routes/order-management.js';
 import { registerOrderShareRoutes, type OrderShareRouteOptions } from './routes/order-share.js';
+import { registerPaymentRoutes, type PaymentRouteOptions } from './routes/payments.js';
 
 export interface BuildAppOptions {
   config?: AppConfig;
@@ -51,6 +52,7 @@ export interface BuildAppOptions {
   orderState?: OrderStateRouteOptions;
   orderManagement?: OrderManagementRouteOptions;
   orderShare?: OrderShareRouteOptions;
+  payment?: PaymentRouteOptions;
 }
 
 declare module 'fastify' {
@@ -126,6 +128,9 @@ export async function buildApp(options: BuildAppOptions = {}): Promise<FastifyIn
   if (options.orderShare) {
     await registerOrderShareRoutes(app, options.orderShare);
   }
+  if (options.payment) {
+    await registerPaymentRoutes(app, options.payment);
+  }
 
   return app;
 }