fix(firstleg): start loading when PDA task is claimed

firstleg/src/main/java/com/baiyue/firstleg/service/LoadingPickService.java

@@ -127,6 +127,7 @@ public class LoadingPickService {
                 throw conflict("PDA任务分配版本已变化");
             }
         }
+        startPickingIfNeeded(task, operatorId, operatorName);
         insertOperation(taskId, operationId, requestHash, "CLAIM", operatorId, operatorName);
         return view(task, null);
     }
@@ -384,7 +385,7 @@ public class LoadingPickService {
         }
     }
 
-    /** 首笔实际拣货才将预装柜计划推进为拣货中；领取、跳拣和任务创建均不改变货柜状态。 */
+    /** 进入PDA拣货任务即将预装柜计划推进为拣货中；状态推进和历史写入保持幂等。 */
     private void startPickingIfNeeded(LoadingPickTaskEntity task, long operatorId, String operatorName) {
         if (smartLoadingRepository.startPicking(task.getLoadingPlanId(), operatorId, operatorName) != 1) {
             return;
@@ -399,7 +400,7 @@ public class LoadingPickService {
         history.setAfterSnapshot("{\"source\":\"PDA\",\"status\":\"LOADING\"}");
         history.setOperatorId(operatorId);
         history.setOperatorName(operatorName);
-        history.setOperationReason("首笔实际拣货");
+        history.setOperationReason("进入PDA拣货任务");
         smartLoadingRepository.insert(history);
     }