feat(hjgl): 完善焊前检查和防腐检查流程

焊前检查需要同时覆盖下料、组对和防腐检查，并支持移动端查询与保存。
扩展焊前检查模型、服务和页面字段，补充检查结果、不合格原因、整改要求、
附件和防腐检查记录，便于按焊口和材料追溯检查过程。

SGGL/BLL/HJGL/WeldingManage/PipelineMatService.cs

@@ -61,6 +61,22 @@ namespace BLL
             }
         }
 
+        /// <summary>
+        /// 维护管线材料导入编码，只更新材料编码字段，避免影响材料主编码和焊口关联。
+        /// </summary>
+        /// <param name="pipelineMatId">管线材料ID</param>
+        /// <param name="materialCode">材料编码</param>
+        public static void UpdateMaterialCode2(string pipelineMatId, string materialCode)
+        {
+            Model.SGGLDB db = Funs.DB;
+            Model.HJGL_PipeLineMat pipeLineMat = db.HJGL_PipeLineMat.FirstOrDefault(e => e.PipeLineMatId == pipelineMatId);
+            if (pipeLineMat != null)
+            {
+                pipeLineMat.MaterialCode2 = materialCode;
+                db.SubmitChanges();
+            }
+        }
+
         /// <summary>
         /// 根据材料匹配结果反写材料主编码
         /// </summary>
@@ -94,6 +110,40 @@ namespace BLL
 
             return count;
         }
+
+        /// <summary>
+        /// 按管线材料ID清除已反写的材料主编码，保留导入材料编码。
+        /// </summary>
+        /// <param name="pipeLineMatIds">管线材料ID列表。</param>
+        /// <returns>清除数量。</returns>
+        public static int ClearMaterialCodeByPipeLineMatIds(IEnumerable<string> pipeLineMatIds)
+        {
+            var idList = pipeLineMatIds == null
+                ? new List<string>()
+                : pipeLineMatIds.Where(x => !string.IsNullOrEmpty(x)).Distinct().ToList();
+            if (!idList.Any())
+            {
+                return 0;
+            }
+
+            Model.SGGLDB db = Funs.DB;
+            int count = 0;
+            var pipeLineMats = db.HJGL_PipeLineMat
+                .Where(e => idList.Contains(e.PipeLineMatId) && e.MaterialCode != null && e.MaterialCode != "")
+                .ToList();
+            foreach (var item in pipeLineMats)
+            {
+                item.MaterialCode = null;
+                count++;
+            }
+
+            if (count > 0)
+            {
+                db.SubmitChanges();
+            }
+
+            return count;
+        }
         /// <summary>
         /// 根据unitworkid删除焊口
         /// </summary>