Add background mode support to localagent and implement instance check

main.go

@@ -4,16 +4,30 @@
 //
 //	GOOS=windows GOARCH=amd64 go build -ldflags "-s -w" -o localagent.exe .
 //
-// The binary is a normal console application. A CMD window appears on launch
-// and prints the listen address. Press Ctrl+C to stop.
+// A CMD window appears on launch. Use -background to start without a window:
+//
+//	localagent.exe -background
 package main
 
 import (
+	"flag"
+
 	"tea.chunkbyte.com/kato/go-worm/lib/agent"
 	"tea.chunkbyte.com/kato/go-worm/lib/helpers"
+	"tea.chunkbyte.com/kato/go-worm/lib/instance"
 )
 
 func main() {
+	background := flag.Bool("background", false, "run without a console window")
+	flag.Parse()
+
+	if *background {
+		if err := instance.Detach(); err != nil {
+			helpers.Log.Fatalf("%v", err)
+		}
+		return
+	}
+
 	a, err := agent.New()
 	if err != nil {
 		helpers.Log.Fatalf("%v", err)