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/commerce/admin.routes.js

@@ -0,0 +1 @@
+const r=require("express").Router(),c=require("../../controllers/commerce/admin.controller"),{authenticate}=require("../../middleware/auth.middleware"),{checkPermission}=require("../../middleware/permission.middleware"),validate=require("../../middleware/validate.middleware"),s=require("../../validation/commerce.schemas");r.use(authenticate);r.get("/orders",checkPermission("orders.read",{custom:true}),c.orders);r.get("/orders/:id",checkPermission("orders.read",{custom:true}),c.order);r.post("/orders/:id/cancel",checkPermission("orders.cancel",{custom:true}),c.cancel);r.post("/orders/:id/mark-processing",checkPermission("orders.manage",{custom:true}),c.processing);r.post("/orders/:id/refunds",checkPermission("payments.refund",{custom:true}),validate(s.refund),c.refund);r.get("/returns",checkPermission("returns.read",{custom:true}),c.returns);r.post("/returns/:id/approve",checkPermission("returns.manage",{custom:true}),c.returnAction("APPROVED"));r.post("/returns/:id/reject",checkPermission("returns.manage",{custom:true}),c.returnAction("REJECTED"));r.post("/returns/:id/mark-received",checkPermission("returns.manage",{custom:true}),c.returnAction("RECEIVED"));r.post("/returns/:id/complete",checkPermission("returns.manage",{custom:true}),validate(s.returnComplete),c.returnAction("COMPLETED"));module.exports=r;