feat(app): 接入金币充值与会员商品下单

lib/core/data/repositories/store_repository.dart

@@ -0,0 +1,25 @@
+// Author: fruit.com.cn
+
+import '../models/order.dart';
+import '../models/product.dart';
+import '../remote/commerce_api.dart';
+
+/// 商品与订单来源：充值页、会员页共用。
+abstract interface class StoreRepository {
+  Future<List<AppProduct>> fetchProducts({String? type});
+
+  Future<AppOrder> createOrder(String productId);
+}
+
+class HttpStoreRepository implements StoreRepository {
+  const HttpStoreRepository(this._api);
+
+  final CommerceApi _api;
+
+  @override
+  Future<List<AppProduct>> fetchProducts({String? type}) =>
+      _api.products(type: type);
+
+  @override
+  Future<AppOrder> createOrder(String productId) => _api.createOrder(productId);
+}