update order and order item model

backend/app/Model/OrderItem.php

@@ -21,8 +21,8 @@ namespace App\Model;
  * @property int $quantity 商品子项总数量
  * @property string $discount 订单子项总的折扣金额
  * @property string $total 总金额 = 单价X数量 - 折扣
- * @property string $created_date 订单创建时间（与父订单 created_date 一致，hypertable 分区键）
- * @property string $ext 扩展字段
+ * @property \Carbon\Carbon $created_date 订单创建时间（与父订单 created_date 一致，hypertable 分区键）
+ * @property array|null $ext 扩展字段
  * @property \Carbon\Carbon $created_at
  * @property \Carbon\Carbon $updated_at
  * @mixin \App_Model_OrderItem
@@ -42,7 +42,20 @@ class OrderItem extends Model
     /**
      * The attributes that should be cast to native types.
      */
-    protected array $casts = ['id' => 'integer', 'company_id' => 'integer', 'platform_id' => 'integer', 'store_id' => 'integer', 'order_id' => 'integer', 'sub_order_type_id' => 'integer', 'product_id' => 'integer', 'quantity' => 'integer', 'created_at' => 'datetime', 'updated_at' => 'datetime'];
+    protected array $casts = [
+        'id' => 'integer',
+        'company_id' => 'integer',
+        'platform_id' => 'integer',
+        'store_id' => 'integer',
+        'order_id' => 'integer',
+        'sub_order_type_id' => 'integer',
+        'product_id' => 'integer',
+        'quantity' => 'integer',
+        'created_date' => 'datetime',
+        'ext' => 'json',
+        'created_at' => 'datetime',
+        'updated_at' => 'datetime',
+    ];
 
     /**
      * 获取父订单（基于 hypertable 分区键查询）