feat: support monitor cli override flags

internal/config/config.go

@@ -17,7 +17,21 @@ type Config struct {
 	MonitorPort       int    `json:"monitorPort"`
 }
 
+type Overrides struct {
+	BackendURL        string
+	Identifier        string
+	APIKey            string
+	ReportIntervalSec int
+	LogLevel          string
+	RootFS            string
+	MonitorPort       int
+}
+
 func Load(path string) (Config, error) {
+	return LoadWithOverrides(path, Overrides{})
+}
+
+func LoadWithOverrides(path string, overrides Overrides) (Config, error) {
 	cfg := Config{
 		BackendURL:        getenvAny([]string{"HF_MONITER_BACKEND_URL", "HF_MONITOR_BACKEND_URL"}, "https://monitor.hangman-lab.top"),
 		Identifier:        getenvAny([]string{"HF_MONITER_IDENTIFIER", "HF_MONITOR_IDENTIFIER"}, hostnameOr("unknown-host")),
@@ -46,6 +60,28 @@ func Load(path string) (Config, error) {
 	cfg.RootFS = getenvAny([]string{"HF_MONITER_ROOTFS", "HF_MONITOR_ROOTFS"}, cfg.RootFS)
 	cfg.MonitorPort = getenvIntAny([]string{"MONITOR_PORT", "HF_MONITOR_PORT"}, cfg.MonitorPort)
 
+	if overrides.BackendURL != "" {
+		cfg.BackendURL = overrides.BackendURL
+	}
+	if overrides.Identifier != "" {
+		cfg.Identifier = overrides.Identifier
+	}
+	if overrides.APIKey != "" {
+		cfg.APIKey = overrides.APIKey
+	}
+	if overrides.ReportIntervalSec > 0 {
+		cfg.ReportIntervalSec = overrides.ReportIntervalSec
+	}
+	if overrides.LogLevel != "" {
+		cfg.LogLevel = overrides.LogLevel
+	}
+	if overrides.RootFS != "" {
+		cfg.RootFS = overrides.RootFS
+	}
+	if overrides.MonitorPort > 0 {
+		cfg.MonitorPort = overrides.MonitorPort
+	}
+
 	if cfg.BackendURL == "" {
 		return cfg, fmt.Errorf("backendUrl is required")
 	}