chore: reorganize go code

cmd/hp_agent/hp_agent.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	_ "github.com/joho/godotenv/autoload"
+	"github.com/tale/headplane/agent/internal/config"
+	"github.com/tale/headplane/agent/internal/hpagent"
+	"github.com/tale/headplane/agent/internal/sshutil"
+	"github.com/tale/headplane/agent/internal/tsnet"
+	"github.com/tale/headplane/agent/internal/util"
+)
+
+type Register struct {
+	Type string
+	ID   string
+}
+
+func main() {
+	log := util.GetLogger()
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatal("Failed to load config: %s", err)
+	}
+
+	log.SetDebug(cfg.Debug)
+	agent := tsnet.NewAgent(cfg)
+
+	agent.Connect()
+	defer agent.Shutdown()
+
+	log.Msg(&Register{
+		Type: "register",
+		ID:   agent.ID,
+	})
+
+	sshutil.DispatchSSHStdin()
+	hpagent.FollowMaster(agent)
+}