feat(agent): add persistent klogging settings

- Add settings API and UI to toggle keylog
- Persist preference in settings.json
- Expose klogging state in status endpoint
- Inject build version into web console
- Bump version automatically on build

lib/keylog/keylog.go

@@ -17,6 +17,23 @@ var (
 	writerWG sync.WaitGroup
 )
 
+func Running() bool {
+	mu.Lock()
+	defer mu.Unlock()
+	return running
+}
+
+func SetEnabled(on bool) error {
+	if err := config.SetKeylogEnabled(on); err != nil {
+		return err
+	}
+	if !on {
+		Stop()
+		return nil
+	}
+	return Start()
+}
+
 func Start() error {
 	if !config.KeylogEnabled() {
 		return nil