feat: 任务失败返回错误信息

src/main/java/com/nokia/pm_interface_5g/task/FiveGPmTask.java

@@ -87,7 +87,7 @@ public class FiveGPmTask {
 
             return ReturnT.SUCCESS;
         } catch (Exception e) {
-            return ReturnT.FAIL;
+            return new ReturnT<>(500, e.getMessage());
         }
     }