添加多个方法的注释以提高代码可读性

添加了以下方法的注释：
- `CheckDPETerminals`：检查地排端子
- `CheckWireErpNr`：检查线材料号
- `CheckNumberTube`：检查号码管
- `CheckRequiredFields`：检查必填项
- `CheckCeCompliance`：检查是否全部使用CE认证物料
- `CheckInsulation`：检查变色套大小与是否使用变色管
- `CheckDuplicateModel`：检查重复
- `SetItemError`：将一项设置为异常
- `GetCanUsedTerminal`：获取可使用的端子
- `CheckImprint`：检查变色套是否使用正确的颜色

Sinvo.EplanHpD.Plugin.WPFUI/ViewModel/MainViewModel.Check.cs

@@ -45,7 +45,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
             CheckDPETerminals(item);
             CheckDuplicateModel(item);
         }
-
+        /// <summary>
+        /// 检查地排端子
+        /// </summary>
+        /// <param name="item"></param>
         public void CheckDPETerminals(StuffedDataModel item)
         {
             // 地排只检查4.0线径以下的
@@ -63,6 +66,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 }
         }
 
+        /// <summary>
+        /// 检查线材料号
+        /// </summary>
+        /// <param name="item"></param>
         public void CheckWireErpNr(StuffedDataModel item)
         {
             var wireInfos = ExcelHelper.GetWireInfo(item.WireModel);
@@ -88,7 +95,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
 
             }
         }
-
+        /// <summary>
+        /// 检查号码管
+        /// </summary>
+        /// <param name="item"></param>
         private void CheckNumberTube(StuffedDataModel item)
         {
             if (string.IsNullOrEmpty(item.NumberTubeSpec))
@@ -96,7 +106,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 SetItemError(item, "未匹配到正确的号码管！\r\n");
             }
         }
-
+        /// <summary>
+        /// 检查必填项
+        /// </summary>
+        /// <param name="item"></param>
         private void CheckRequiredFields(StuffedDataModel item)
         {
             if (string.IsNullOrEmpty(item.RearTerminalMaterialCode))
@@ -120,7 +133,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 SetItemError(item, "印记(线号)内容为空\r\n");
             }
         }
-
+        /// <summary>
+        /// 检查是否全部使用CE认证物料
+        /// </summary>
+        /// <param name="item"></param>
         private void CheckCeCompliance(StuffedDataModel item)
         {
             if (item.WireModel.IndexOf("-CE", StringComparison.OrdinalIgnoreCase) < 0)
@@ -136,7 +152,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 SetItemError(item, "后端子未使用CE认证端子！\r\n");
             }
         }
-
+        /// <summary>
+        /// 检查变色套（绝缘软套）大小与是否使用了变色管
+        /// </summary>
+        /// <param name="item"></param>
         public void CheckInsulation(StuffedDataModel item)
         {
             if (item.Insulation != null && item.Insulation.Specification != null)
@@ -217,7 +236,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 SetItemError(item, "该型号无可用端子！\r\n");
             }
         }
-
+        /// <summary>
+        /// 检查重复
+        /// </summary>
+        /// <param name="item"></param>
         private void CheckDuplicateModel(StuffedDataModel item)
         {
             if (StuffedData?.Count(it => it != null && it.Model == item.Model) > 1)
@@ -248,14 +270,25 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
                 }
             }
         }
-
+        /// <summary>
+        /// 将一项设置为异常
+        /// </summary>
+        /// <param name="item"></param>
+        /// <param name="errorMsg"></param>
         private void SetItemError(StuffedDataModel item, string errorMsg)
         {
+            if (!errorMsg.EndsWith("\r\n"))
+                errorMsg += "\r\n";
+
             item.IsError = true;
             item.ErrorCount += 1;
             item.CheckedMsg += errorMsg;
         }
-
+        /// <summary>
+        /// 获取可使用的端子
+        /// </summary>
+        /// <param name="wireModel"></param>
+        /// <returns></returns>
         private List<TerminalModel> GetCanUsedTerminal(string wireModel)
         {
             var result = ExcelHelper.GetWireTerminalMappingTable(wireModel);
@@ -350,7 +383,10 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI.ViewModel
             }
             return terminals;
         }
-
+        /// <summary>
+        /// 检查变色套是否使用正确的颜色
+        /// </summary>
+        /// <param name="item"></param>
         private void CheckImprint(StuffedDataModel item)
         {
             var imprintConditions = new List<(string Prefix, WireFlagType? FlagType, string Color)>