支持删除操作：更新 OperationItem 条件判断

在 `NewClientDataView.cs` 文件中，修改了 `OASystem.Domain.ViewModels.CRM` 命名空间下的代码，将 `if` 条件中的 `OperationItem` 判断从 `OperationEnum.Add || OperationEnum.Details || OperationEnum.Edit` 修改为 `OperationEnum.Add or OperationEnum.Details or OperationEnum.Edit or OperationEnum.Del`。这意味着现在 `OperationItem` 还可以是 `OperationEnum.Del`，即删除操作时也会进入该条件分支。

OASystem/OASystem.Domain/ViewModels/CRM/NewClientDataView.cs

@@ -357,7 +357,7 @@ namespace OASystem.Domain.ViewModels.CRM
             {
                 var lable = string.Empty;
 
-                if (OperationItem == OperationEnum.Add || OperationItem == OperationEnum.Details || OperationItem == OperationEnum.Edit)
+                if (OperationItem is OperationEnum.Add or OperationEnum.Details or OperationEnum.Edit or OperationEnum.Del)
                 {
                     if (!string.IsNullOrEmpty(Client))
                     {