feat(app): 接入金币充值与会员商品下单

lib/core/data/models/order.dart

@@ -0,0 +1,49 @@
+// Author: fruit.com.cn
+
+import 'json_numbers.dart';
+
+/// 充值订单：`POST /app/orders` 创建的 `CREATED` 订单，等待支付。
+class AppOrder {
+  const AppOrder({
+    required this.id,
+    required this.orderNo,
+    required this.productName,
+    required this.coinAmount,
+    required this.status,
+    this.productId = '',
+    this.type = '',
+    this.amount = '',
+    this.currency = '',
+    this.createdAt,
+  });
+
+  static const String created = 'CREATED';
+
+  final String id;
+  final String orderNo;
+  final String productId;
+  final String productName;
+  final String type;
+  final int coinAmount;
+  final String amount;
+  final String currency;
+  final String status;
+  final DateTime? createdAt;
+
+  bool get isCreated => status == created;
+
+  factory AppOrder.fromJson(Map<String, dynamic> json) {
+    return AppOrder(
+      id: (json['id'] ?? '').toString(),
+      orderNo: json['orderNo'] as String? ?? '',
+      productId: (json['productId'] ?? '').toString(),
+      productName: json['productName'] as String? ?? '',
+      type: json['type'] as String? ?? '',
+      coinAmount: jsonToInt(json['coinAmount']),
+      amount: (json['amount'] ?? '').toString(),
+      currency: json['currency'] as String? ?? '',
+      status: json['status'] as String? ?? '',
+      createdAt: DateTime.tryParse(json['createdAt'] as String? ?? ''),
+    );
+  }
+}

lib/core/data/models/product.dart

@@ -0,0 +1,54 @@
+// Author: fruit.com.cn
+
+import 'json_numbers.dart';
+
+/// 充值商品：`GET /app/products` 的 `COIN_PACK` / `VIP` 条目。
+class AppProduct {
+  const AppProduct({
+    required this.id,
+    required this.code,
+    required this.name,
+    required this.type,
+    this.coinAmount = 0,
+    this.bonusCoin = 0,
+    this.totalCoin = 0,
+    this.displayPrice = '',
+    this.currency = '',
+    this.vipDays = 0,
+  });
+
+  static const String coinPackType = 'COIN_PACK';
+  static const String vipType = 'VIP';
+
+  final String id;
+  final String code;
+  final String name;
+  final String type;
+  final int coinAmount;
+  final int bonusCoin;
+  final int totalCoin;
+  final String displayPrice;
+  final String currency;
+  final int vipDays;
+
+  bool get isVip => type == vipType;
+
+  factory AppProduct.fromJson(Map<String, dynamic> json) {
+    final coinAmount = jsonToInt(json['coinAmount']);
+    final bonusCoin = jsonToInt(json['bonusCoin']);
+    return AppProduct(
+      id: (json['id'] ?? '').toString(),
+      code: json['code'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      type: json['type'] as String? ?? '',
+      coinAmount: coinAmount,
+      bonusCoin: bonusCoin,
+      totalCoin: json['totalCoin'] == null
+          ? coinAmount + bonusCoin
+          : jsonToInt(json['totalCoin']),
+      displayPrice: json['displayPrice'] as String? ?? '',
+      currency: json['currency'] as String? ?? '',
+      vipDays: jsonToInt(json['vipDays']),
+    );
+  }
+}