fix(predesign): 修复包装与车次关联数据一致性问题

包装管理存在两个一致性问题：一是组件可重复进入其他包装，导致
组件归属冲突；二是删除车次后包装仍保留旧车次关联，产生脏数据。
本次修改统一补齐校验和解绑逻辑，避免包装与发货数据出现错误关联。

SGGL/BLL/HJGL/PreDesign/TrainNumberManageService.cs

@@ -144,11 +144,19 @@ namespace BLL
 
         public static void DeleteById(string Id)
         {
-            Model.HJGL_TrainNumberManage table = Funs.DB.HJGL_TrainNumberManage.FirstOrDefault(x => x.Id == Id);
+            var db = Funs.DB;
+            Model.HJGL_TrainNumberManage table = db.HJGL_TrainNumberManage.FirstOrDefault(x => x.Id == Id);
             if (table != null)
             {
-                Funs.DB.HJGL_TrainNumberManage.DeleteOnSubmit(table);
-                Funs.DB.SubmitChanges();
+                var packagingList = db.HJGL_PackagingManage.Where(x => x.TrainNumberId == Id).ToList();
+                foreach (var item in packagingList)
+                {
+                    item.TrainNumberId = null;
+                    item.TrainNumber = null;
+                }
+
+                db.HJGL_TrainNumberManage.DeleteOnSubmit(table);
+                db.SubmitChanges();
             }
         }
 
@@ -167,4 +175,4 @@ namespace BLL
             }
         }
     }
-}
+}