feat: Implement Phase 6 Shopping and Checkout

- Introduced authenticated shopping state and atomic checkout process without creating orders or payments.
- Reused existing components from previous phases including identities, addresses, catalogues, pricing, and inventory.
- Developed cart architecture to support one active cart per user with unique items per variant.
- Implemented dynamic cart pricing with various precedence rules for promotions and coupons.
- Created a wishlist feature that exposes only visible active products without reserving inventory.
- Integrated inventory validation to ensure availability of items before adding to cart.
- Developed a checkout architecture that locks the cart, revalidates pricing and shipping, and reserves inventory.
- Added shipping zones, methods, and rates with configurable options for international shipping and duty/tax boundaries.
- Implemented checkout snapshots to capture immutable checkout details.
- Introduced idempotency for checkout requests to prevent duplicate processing.
- Added functionality for coupon integration and business checkout validation.
- Established permissions for managing shipping zones, methods, and rates.
- Created comprehensive unit tests covering various aspects of the shopping and checkout processes.
- Added cron job for handling checkout expiry reconciliation.
- Created migration script to set up new database tables and constraints for carts, checkout sessions, and shipping.

app/routes/index.js

@@ -32,6 +32,8 @@ const inventoryAdminRoutes = require("./inventory/admin.routes");
 const merchandisingAdminRoutes = require("./merchandising/admin.routes");
 const pricingAdminRoutes = require("./pricing/admin.routes");
 const merchandisingPublicRoutes = require("./merchandising/public.routes");
+const shoppingRoutes = require("./shopping.routes");
+const shippingAdminRoutes = require("./shipping/admin.routes");
 
 const router = express.Router();
 
@@ -56,5 +58,7 @@ router.use("/admin", inventoryAdminRoutes);
 router.use("/admin", merchandisingAdminRoutes);
 router.use("/admin", pricingAdminRoutes);
 router.use("/", merchandisingPublicRoutes);
+router.use("/", shoppingRoutes);
+router.use("/admin", shippingAdminRoutes);
 
 module.exports = router;