fix: parse systemctl ExecStart path= format correctly

agent/internal/procctl/systemctl.go

@@ -56,20 +56,36 @@ func (s *SystemCtlController) Status() (Status, error) {
 
 func (s *SystemCtlController) Version() (string, error) {
 	// 从 systemctl 获取 ExecStart 路径，再调用 --version
+	// Output format: { path=/path/to/binary ; argv[]=... }
 	binOut, err := exec.Command("systemctl", "show", "--property=ExecStart", "--value", s.serviceName).Output()
 	if err != nil {
 		return "", fmt.Errorf("get version failed: %w", err)
 	}
-	binPath := strings.Fields(strings.TrimSpace(string(binOut)))[0]
+	out := strings.TrimSpace(string(binOut))
+	// Parse path= from systemctl ExecStart format
+	const prefix = "path="
+	idx := strings.Index(out, prefix)
+	if idx < 0 {
+		return "", fmt.Errorf("get version failed: cannot parse ExecStart")
+	}
+	rest := out[idx+len(prefix):]
+	end := strings.IndexByte(rest, ' ')
+	if end < 0 {
+		end = strings.IndexByte(rest, ';')
+	}
+	if end < 0 {
+		end = len(rest)
+	}
+	binPath := rest[:end]
 	if binPath == "" {
 		return "", fmt.Errorf("get version failed: empty ExecStart")
 	}
 	cmd := exec.Command(binPath, "--version")
-	out, err := cmd.Output()
+	out2, err := cmd.Output()
 	if err != nil {
 		return "", fmt.Errorf("get version failed: %w", err)
 	}
-	return strings.TrimSpace(string(out)), nil
+	return strings.TrimSpace(string(out2)), nil
 }
 
 func (s *SystemCtlController) Start(configName string) (Status, error) {