Release v2.0.0: Integrate adt-cli core Major changes: - Integrated adt-cli core library for security features - Path traversal protection (validate_path_safe) - SSRF protection (is_safe_download_url, is_public_ip) - Strict domain validation (_is_yandex_domain) - Unified config system with CLI - Extended DownloadManager with media/cloud/sync support - Modern UI with status bar and keyboard shortcuts - Comprehensive documentation (README.md, TECHNICAL.md)