fix(license): bind deviceId to physical machine, not OS user

Use OS machine identifiers (Windows MachineGuid, macOS IOPlatformUUID, Linux machine-id) hashed as deviceId so all accounts on one PC share one license slot. Keep legacy userData/device.id for migration and retire it on re-activation.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/license/paths.ts

@@ -9,6 +9,7 @@ export function licenseFallbackSealedPath(userData: string): string {
   return path.join(userData, 'license.sealed.fallback');
 }
 
+/** Устаревший per-user UUID; актуальный deviceId — fingerprint машины (см. machineFingerprint.ts). */
 export function deviceIdPath(userData: string): string {
   return path.join(userData, 'device.id');
 }