feat: 添加商户规则支持和用户实体扩展

- 在 `UserEntity` 中添加 `canteenId` 字段以支持离线模式
- 新增 `ServiceMchRule` 模型和相关 API 方法用于获取商户规则
- 更新 `CanteenExtraPriceSetting` 模型以包含商户规则列表
- 在 `CanteenProductController` 中添加获取商户规则的逻辑
- 更新数据库表结构以支持 `canteenId` 字段

lib/common/models/api/wallet_api_models.dart

@@ -52,3 +52,37 @@ class ServicePaySetting {
 
   Map<String, dynamic> toJson() => _$ServicePaySettingToJson(this);
 }
+
+@JsonSerializable()
+class ServiceMchRule {
+  String id;
+
+  /// 源商户id
+  String sourceMchId;
+
+  /// 目标商户id
+  String targetMchId;
+
+  /// 规则配置id
+  int rulePriceConfigId;
+
+  /// 基础价格
+  int basePrice;
+
+  /// 额外需要支付的倍数
+  int multiple;
+
+  ServiceMchRule({
+    required this.id,
+    required this.sourceMchId,
+    required this.targetMchId,
+    required this.rulePriceConfigId,
+    required this.basePrice,
+    required this.multiple,
+  });
+
+  factory ServiceMchRule.fromJson(Map<String, dynamic> json) =>
+      _$ServiceMchRuleFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ServiceMchRuleToJson(this);
+}

lib/common/models/api/wallet_api_models.g.dart

@@ -36,3 +36,23 @@ Map<String, dynamic> _$ServicePaySettingToJson(ServicePaySetting instance) =>
       'offLineOrderApplyEnable':
           JsonTool.booleanToString(instance.offLineOrderApplyEnable),
     };
+
+ServiceMchRule _$ServiceMchRuleFromJson(Map<String, dynamic> json) =>
+    ServiceMchRule(
+      id: json['id'] as String,
+      sourceMchId: json['sourceMchId'] as String,
+      targetMchId: json['targetMchId'] as String,
+      rulePriceConfigId: (json['rulePriceConfigId'] as num).toInt(),
+      basePrice: (json['basePrice'] as num).toInt(),
+      multiple: (json['multiple'] as num).toInt(),
+    );
+
+Map<String, dynamic> _$ServiceMchRuleToJson(ServiceMchRule instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'sourceMchId': instance.sourceMchId,
+      'targetMchId': instance.targetMchId,
+      'rulePriceConfigId': instance.rulePriceConfigId,
+      'basePrice': instance.basePrice,
+      'multiple': instance.multiple,
+    };