feat(ADM-018): completed feature

project/src/modules/checkout/index.ts

@@ -0,0 +1,12 @@
+/** Public API of the checkout module. */
+export { registerCheckoutRoutes, type CheckoutRoutesDeps } from './api/checkout.routes.js';
+export { CheckoutService } from './application/checkout-service.js';
+export {
+  CheckoutError,
+  type CheckoutRequest,
+  type CheckoutResult,
+  type PaymentIntent,
+} from './domain/checkout.js';
+export type { CheckoutMetrics, PaymentProvider, CheckoutOrderLookup } from './domain/ports.js';
+export { InMemoryCheckoutMetrics } from './infrastructure/metrics.js';
+export { StubPaymentProvider } from './infrastructure/payment-provider.js';