feat: 完善库存锁定幂等与批次扣减策略

src/Domain/TakeoutSaaS.Domain/Inventory/Entities/InventoryBatch.cs

@@ -1,3 +1,5 @@
+using System;
+using System.ComponentModel.DataAnnotations;
 using TakeoutSaaS.Shared.Abstractions.Entities;
 
 namespace TakeoutSaaS.Domain.Inventory.Entities;
@@ -41,4 +43,10 @@ public sealed class InventoryBatch : MultiTenantEntityBase
     /// 剩余数量。
     /// </summary>
     public int RemainingQuantity { get; set; }
+
+    /// <summary>
+    /// 并发控制字段。
+    /// </summary>
+    [Timestamp]
+    public byte[] RowVersion { get; set; } = Array.Empty<byte>();
 }