长任务开始大量使用，日志名由LongTask改为LT

diff --git a/NewLife.Core/Log/Logger.cs b/NewLife.Core/Log/Logger.cs
index 33c66e6..ef608ed 100644
--- a/NewLife.Core/Log/Logger.cs
+++ b/NewLife.Core/Log/Logger.cs
@@ -261,7 +261,7 @@ public abstract class Logger : ILog
         sb.AppendFormat("#SystemStarted: {0}\r\n", TimeSpan.FromMilliseconds(Runtime.TickCount64));
         sb.AppendFormat("#Date: {0:yyyy-MM-dd}\r\n", DateTime.Now.AddHours(set.UtcIntervalHours));
         sb.AppendFormat("#详解：{0}\r\n", "https://newlifex.com/core/log");
-        sb.AppendFormat("#字段: 时间 线程ID 线程池Y/网页W/普通N/定时T 线程名/任务ID 消息内容\r\n");
+        sb.AppendFormat("#字段: 时间 线程ID 线程池Y/网页W/普通N 线程名/任务ID/定时T/长任务LT 消息内容\r\n");
         //sb.AppendFormat("#Fields: Time ThreadID Kind Name Message\r\n");
 
         var format = set.LogLineFormat;

diff --git a/NewLife.Core/Log/WriteLogEventArgs.cs b/NewLife.Core/Log/WriteLogEventArgs.cs
index d427207..b483004 100644
--- a/NewLife.Core/Log/WriteLogEventArgs.cs
+++ b/NewLife.Core/Log/WriteLogEventArgs.cs
@@ -125,7 +125,7 @@ public class WriteLogEventArgs : EventArgs
         if (name.IsNullOrEmpty()) name = TaskID >= 0 ? TaskID + "" : "-";
         if (name.EqualIgnoreCase("Threadpool worker", ".NET ThreadPool Worker", ".NET TP Worker", "Thread Pool Worker")) name = TaskID >= 0 ? TaskID + "" : "TP";
         if (name.EqualIgnoreCase("IO Threadpool worker")) name = "IO";
-        if (name.EqualIgnoreCase(".NET Long Running Task")) name = "LongTask";
+        if (name.EqualIgnoreCase(".NET Long Running Task")) name = "LT";
         //if (name.EqualIgnoreCase(".NET TP Worker")) name = "TP";
 
         //return $"{Time:HH:mm:ss.fff} {ThreadID,2} {(IsPool ? (IsWeb ? 'W' : 'Y') : 'N')} {name} {Message}";