Revert "优化服务退出流程，增加中间件文档"

This reverts commit c511a2e6b3.

server/internal/cmd/handler_shutdown.go

@@ -3,6 +3,7 @@
 // @Copyright  Copyright (c) 2023 HotGo CLI
 // @Author  Ms <133814250@qq.com>
 // @License  https://github.com/bufanyun/hotgo/blob/master/LICENSE
+//
 package cmd
 
 import (
@@ -10,12 +11,6 @@ import (
 	"github.com/gogf/gf/v2/os/gproc"
 	"hotgo/utility/simple"
 	"os"
-	"sync"
-)
-
-var (
-	serverCloseSignal = make(chan struct{}, 1)
-	serverWg          = sync.WaitGroup{}
 )
 
 func signalHandlerForOverall(sig os.Signal) {