refactor: remove hardcoded paths from systemctl controller, use agent config

agent/internal/httpapi/server.go

@@ -88,7 +88,7 @@ func New(agentCfg config.AgentConfig, baseDir string, ms *mediaserver.Client, st
 		pc = procctl.New(agentCfg, baseDir)
 	} else {
 		// 使用 systemctl 模式管理 Media Server
-		pc = procctl.NewSystemCtlController("safesight-edge-server")
+		pc = procctl.NewSystemCtlController("safesight-edge-server", strings.TrimSpace(agentCfg.ConfigPath))
 	}
 	execPath, _ := os.Executable()
 	if execPath != "" {

agent/internal/procctl/systemctl.go

@@ -12,14 +12,15 @@ import (
 
 // SystemCtlController 使用 systemctl 管理 Media Server
 type SystemCtlController struct {
-	serviceName string
+    serviceName string
+    configPath  string
 }
 
-// NewSystemCtlController 创建 systemctl 控制器
-func NewSystemCtlController(serviceName string) *SystemCtlController {
-	return &SystemCtlController{
-		serviceName: serviceName,
-	}
+func NewSystemCtlController(serviceName string, configPath string) *SystemCtlController {
+    return &SystemCtlController{
+        serviceName: serviceName,
+        configPath:  configPath,
+    }
 }
 
 func (s *SystemCtlController) Enabled() bool { return s != nil }
@@ -49,13 +50,21 @@ func (s *SystemCtlController) Status() (Status, error) {
 	return Status{
 		Running:    true,
 		Pid:        pid,
-		ConfigPath: "/opt/safesight-edge-server/etc/media-server.json",
+		ConfigPath: s.configPath,
 	}, nil
 }
 
 func (s *SystemCtlController) Version() (string, error) {
-	// 直接执行 media-server --version
-	cmd := exec.Command("/opt/safesight-edge-server/bin/safesight-edge-server", "--version")
+	// 从 systemctl 获取 ExecStart 路径，再调用 --version
+	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]
+	if binPath == "" {
+		return "", fmt.Errorf("get version failed: empty ExecStart")
+	}
+	cmd := exec.Command(binPath, "--version")
 	out, err := cmd.Output()
 	if err != nil {
 		return "", fmt.Errorf("get version failed: %w", err)