重新整理物联网服务，分离业务逻辑。

iot/EdgeAgent/updater/main_linux.go

@@ -0,0 +1,27 @@
+//go:build linux
+// +build linux
+
+package main
+
+import (
+	"os"
+	"os/exec"
+)
+
+type mainProgramStarter struct{}
+
+func (s *mainProgramStarter) GetMainName() string {
+	return "main"
+}
+
+func (s *mainProgramStarter) Start(targetExe string) error {
+	if err := os.Chmod(targetExe, 0755); err != nil {
+		return err
+	}
+	cmd := exec.Command(targetExe)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	// Linux 下：先保持最简单，保证能跑
+	return cmd.Start()
+}