refactor(routes): move product/products from cms to ecommerce domain

Product and products routes were sitting under /api/cms but conceptually
belong to a separate e-commerce domain. Split them out into a dedicated
ecommerce subrouter mounted at /api/ecommerce.

src/routes/api/ecommerce/product.routes.js

@@ -0,0 +1,23 @@
+const express = require('express');
+const {
+    getProduct,
+    getProducts,
+    createProduct,
+    addFavoriteProduct,
+    deleteFavoriteProduct,
+    deleteProduct,
+    updateProduct,
+} = require('../../../controllers/product.controller');
+const auth = require('../../../middlewares/auth');
+
+const productRouter = express.Router();
+
+productRouter.get('/', auth.optional, getProducts);
+productRouter.post('/', auth.required, createProduct);
+productRouter.get('/:slug', auth.optional, getProduct);
+productRouter.put('/:slug', auth.required, updateProduct);
+productRouter.delete('/:slug', auth.required, deleteProduct);
+productRouter.post('/:slug/favorite', auth.required, addFavoriteProduct);
+productRouter.delete('/:slug/favorite', auth.required, deleteFavoriteProduct);
+
+module.exports = productRouter;