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/database/database_models.dart

@@ -222,17 +222,22 @@ class CanteenExtraPriceSetting extends Equatable {
   /// 超过的倍数
   double payAmountMealTimes;
 
+  // 商户支付规则列表
+  List<ServiceMchRule>? mchRoleList;
+
   CanteenExtraPriceSetting({
     required this.payAmountEnable,
     required this.payAmountMealLimit,
     required this.payAmountMealTimes,
+    this.mchRoleList,
   });
 
   @override
-  List<Object> get props => [
+  List<Object?> get props => [
         payAmountEnable,
         payAmountMealLimit,
         payAmountMealTimes,
+        mchRoleList,
       ];
 
   factory CanteenExtraPriceSetting.fromJson(Map<String, dynamic> json) =>

lib/common/models/database/database_models.g.dart

@@ -161,6 +161,9 @@ CanteenExtraPriceSetting _$CanteenExtraPriceSettingFromJson(
       payAmountEnable: json['payAmountEnable'] as bool,
       payAmountMealLimit: (json['payAmountMealLimit'] as num).toInt(),
       payAmountMealTimes: (json['payAmountMealTimes'] as num).toDouble(),
+      mchRoleList: (json['mchRoleList'] as List<dynamic>?)
+          ?.map((e) => ServiceMchRule.fromJson(e as Map<String, dynamic>))
+          .toList(),
     );
 
 Map<String, dynamic> _$CanteenExtraPriceSettingToJson(
@@ -169,4 +172,5 @@ Map<String, dynamic> _$CanteenExtraPriceSettingToJson(
       'payAmountEnable': instance.payAmountEnable,
       'payAmountMealLimit': instance.payAmountMealLimit,
       'payAmountMealTimes': instance.payAmountMealTimes,
+      'mchRoleList': instance.mchRoleList,
     };