feat:创建挂单数据库，和迁移文件

lib/common/services/database/entity/order_hold_bill_entity.dart

@@ -0,0 +1,42 @@
+import 'package:floor/floor.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+import 'package:pj_supermarket_cloud/common/index.dart';
+
+part 'order_hold_bill_entity.g.dart';
+
+@JsonSerializable()
+@Entity(tableName: "order_hold_bill")
+class OrderHoldBillEntity {
+  /// 自增ID
+  @PrimaryKey(autoGenerate: true)
+  int? id;
+
+  /// 平台类型
+  SysType sysType;
+
+  /// 订单列表json
+  String? orderListJson;
+
+  /// 支付订单json
+  String? userJson;
+
+  String? orderJson;
+
+  /// 创建时间
+  DateTime createTime;
+
+  OrderHoldBillEntity({
+    this.id,
+    this.orderListJson,
+    this.userJson,
+    this.orderJson,
+    required this.sysType,
+    required this.createTime,
+  });
+
+  factory OrderHoldBillEntity.fromJson(Map<String, dynamic> json) =>
+      _$OrderHoldBillEntityFromJson(json);
+
+  Map<String, dynamic> toJson() => _$OrderHoldBillEntityToJson(this);
+}

lib/common/services/database/entity/order_hold_bill_entity.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'order_hold_bill_entity.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+OrderHoldBillEntity _$OrderHoldBillEntityFromJson(Map<String, dynamic> json) =>
+    OrderHoldBillEntity(
+      id: (json['id'] as num?)?.toInt(),
+      orderListJson: json['orderListJson'] as String?,
+      userJson: json['userJson'] as String?,
+      orderJson: json['orderJson'] as String?,
+      sysType: $enumDecode(_$SysTypeEnumMap, json['sysType']),
+      createTime: DateTime.parse(json['createTime'] as String),
+    );
+
+Map<String, dynamic> _$OrderHoldBillEntityToJson(
+        OrderHoldBillEntity instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'sysType': _$SysTypeEnumMap[instance.sysType]!,
+      'orderListJson': instance.orderListJson,
+      'userJson': instance.userJson,
+      'orderJson': instance.orderJson,
+      'createTime': instance.createTime.toIso8601String(),
+    };
+
+const _$SysTypeEnumMap = {
+  SysType.SUPERMARKET: 'SUPERMARKET',
+  SysType.CANTEEN: 'CANTEEN',
+};