迁移 Flutter 端与训练脚本，模型/训练产物移出 git（遵循纯代码约定）

flutter_app/lib/payment/models.dart

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+/// 充值套餐（来自后端 GET /api/v1/plans，价格以服务端 config.yml 为准）
+class Plan {
+  final String id;
+  final int days;
+  final int priceYuan;
+
+  const Plan({
+    required this.id,
+    required this.days,
+    required this.priceYuan,
+  });
+
+  /// 展示名由天数派生（接口无 label 字段）
+  String get label => '$days天';
+
+  factory Plan.fromJson(Map<String, dynamic> json) => Plan(
+        id: json['planId'] as String,
+        days: json['days'] as int,
+        priceYuan: (json['priceCents'] as num) ~/ 100,
+      );
+}
+
+/// 支付渠道
+enum PayChannel { wechat, alipay }
+
+/// 订单（由后端创建）
+class Order {
+  final String orderId;
+
+  /// 微信支付参数（prepay_id / partner_id / nonce_str / time_stamp / sign 等）
+  final Map<String, dynamic> wechatParams;
+
+  /// 支付宝订单串（orderStr）
+  final String? alipayOrderStr;
+
+  const Order({
+    required this.orderId,
+    this.wechatParams = const {},
+    this.alipayOrderStr,
+  });
+}
+
+/// 授权状态（服务端为准）
+class LicenseStatus {
+  final bool active;
+  final DateTime? expiresAt;
+
+  const LicenseStatus({required this.active, this.expiresAt});
+
+  bool get isActive => active && (expiresAt?.isAfter(DateTime.now()) ?? false);
+
+  factory LicenseStatus.fromJson(Map<String, dynamic> json) => LicenseStatus(
+        active: json['active'] == true,
+        expiresAt: json['expiresAt'] != null
+            ? DateTime.tryParse(json['expiresAt'] as String)
+            : null,
+      );
+}
+
+/// 支付结果
+class PayResult {
+  final bool success;
+  final String? message;
+  final String? orderId;
+
+  const PayResult({required this.success, this.message, this.orderId});
+}