refactor(工单日志): 修改工单日志接口返回类型并优化实现

将WorkOrderLog方法的返回类型从int改为List<ProWorkorderUpdateLog>，并实现查询工单变更日志功能

DOAN.Service/MES/Product/IService/IProWorkorderUtilityService.cs

@@ -34,13 +34,13 @@ namespace DOAN.Service.MES.product.IService
         List<WorkOrderBom> SearchBOMNum(string workorder_num);
 
         /// <summary>
-        /// 工单日志
+        /// 工单变更日志
         /// </summary>
         /// <param name="workorder"></param>
         /// <param name="log"></param>
         /// <param name="Operator"></param>
         /// <returns></returns>
-        int WorkOrderLog(string workorder, string log, string Operator);
+        List<ProWorkorderUpdateLog> WorkOrderLog(string workorder);
 
         /// <summary>
         /// 导出PDF