优化服务退出流程，增加中间件文档

server/internal/cmd/cron.go

@@ -7,10 +7,10 @@ package cmd
 
 import (
 	"context"
+	"github.com/gogf/gf/v2/frame/g"
 	"github.com/gogf/gf/v2/os/gcmd"
 	"hotgo/internal/crons"
 	"hotgo/internal/service"
-	"os"
 )
 
 var (
@@ -25,17 +25,18 @@ var (
 			// tcp客户端
 			service.CronClient().Start(ctx)
 
-			// 退出信号监听
-			signalListen(ctx, func(sig os.Signal) {
-				service.CronClient().Stop(ctx)
-				crons.StopALL()
-				serverCloseSignal <- struct{}{}
-			})
+			serverWg.Add(1)
 
+			// 信号监听
+			signalListen(ctx, signalHandlerForOverall)
 			select {
 			case <-serverCloseSignal:
-				// ...
+				service.CronClient().Stop(ctx)
+				crons.StopALL()
+				serverWg.Done()
 			}
+
+			g.Log().Debug(ctx, "cron successfully closed ..")
 			return
 		},
 	}