优化服务退出流程，增加中间件文档

server/internal/cmd/cmd.go

@@ -13,8 +13,7 @@ import (
 )
 
 var (
-	serverCloseSignal chan struct{}
-	Main              = &gcmd.Command{
+	Main = &gcmd.Command{
 		Description: `默认启动所有服务`,
 		Func: func(ctx context.Context, parser *gcmd.Parser) (err error) {
 			return All.Func(ctx, parser)
@@ -76,10 +75,10 @@ var (
 
 			select {
 			case <-serverCloseSignal:
-				// ...
+				serverWg.Wait()
 			}
 
-			g.Log().Debug(ctx, "service successfully closed ..")
+			g.Log().Debug(ctx, "all service successfully closed ..")
 			return
 		},
 	}
@@ -89,5 +88,4 @@ func init() {
 	if err := Main.AddCommand(All, Http, Queue, Cron, Auth, Tools, Help); err != nil {
 		panic(err)
 	}
-	serverCloseSignal = make(chan struct{}, 1)
 }