- Moved ObfuscateService and ObfuscatedAvatar from services to domain/services.
- Updated references to use globals for stealth mode instead of AppConfig.
- Removed old obfuscated_avatar.dart file and updated imports in call and incoming call pages.
- Cleaned up imports in composition, contact, and history pages to reflect new structure.
- Deleted unused BlockService, CallService, ContactService, AsymmetricCryptoService, and QRScanner classes.
