feat: split DA and API layers by domain, add parallel route docs

src/utils/api/product.ts

@@ -0,0 +1,16 @@
+import http from '../request'
+
+/** 商品列表 */
+export async function fetchProducts() {
+  return http.get('/api/products', { auth: false })
+}
+
+/** 商品详情 */
+export async function fetchProduct(id: string) {
+  return http.get(`/api/products/${id}`, { auth: false })
+}
+
+/** 分类列表 */
+export async function fetchCategories() {
+  return http.get('/api/categories', { auth: false })
+}