fix(qc): 添加数据库锁并优化标签查询逻辑

在QcBackEndService中添加事务锁(DbLockType.Wait)防止并发问题
优化标签查询逻辑，添加Take(1)限制查询结果数量

ZR.Service/mes/qc/backend/QcBackEndService.cs

@@ -701,9 +701,12 @@ namespace ZR.Service.Business
                 int oldPackageLabelSort = 1;
                 QcBackEndRecordLabelScan lastPackagelabelInfo = Context
                     .Queryable<QcBackEndRecordLabelScan>()
+                    // TODO 加锁
+                    .TranLock(DbLockType.Wait)
                     .Where(it => it.WorkOrder == data.WorkOrder)
                     .Where(it => it.LabelType == 1)
                     .OrderByDescending(it => it.LabelSort)
+                    .Take(1)
                     .First();
                 if (lastPackagelabelInfo == null)
                 {
@@ -818,9 +821,12 @@ namespace ZR.Service.Business
                 int oldInnerLabelSort = 0;
                 QcBackEndRecordLabelScan labelScan = Context
                     .Queryable<QcBackEndRecordLabelScan>()
+                    // TODO 加锁
+                    .TranLock(DbLockType.Wait)
                     .Where(it => it.WorkOrder == data.WorkOrder)
                     .Where(it => it.LabelType == 2)
                     .OrderByDescending(it => it.LabelSort)
+                    .Take(1)
                     .First();
                 if (labelScan != null)
                 {