feat: Implement return and refund functionality in commerce module

- Added return request handling in return.controller.js
- Implemented webhook handling for PayHere payments in webhook.controller.js
- Created models for coupon redemptions, invoices, orders, order items, payments, payment attempts, payment webhook events, refunds, return items, and return requests.
- Developed services for order management, payment processing, refunds, and returns.
- Introduced validation schemas for payment and return requests.
- Created migration scripts for new database tables related to orders, payments, refunds, and returns.
- Added unit tests for order state transitions and PayHere provider functionality.

app/routes/index.js

@@ -34,6 +34,8 @@ const pricingAdminRoutes = require("./pricing/admin.routes");
 const merchandisingPublicRoutes = require("./merchandising/public.routes");
 const shoppingRoutes = require("./shopping.routes");
 const shippingAdminRoutes = require("./shipping/admin.routes");
+const commerceRoutes = require("./commerce.routes");
+const commerceAdminRoutes = require("./commerce/admin.routes");
 
 const router = express.Router();
 
@@ -60,5 +62,7 @@ router.use("/admin", pricingAdminRoutes);
 router.use("/", merchandisingPublicRoutes);
 router.use("/", shoppingRoutes);
 router.use("/admin", shippingAdminRoutes);
+router.use("/", commerceRoutes);
+router.use("/admin", commerceAdminRoutes);
 
 module.exports = router;