v1.1.0

Release v1.1.0 - Public DownloadVideo API

Features:
- New DownloadVideo() and DownloadVideoWithOptions() public API functions
- Support for audio-only extraction (MP3) with configurable quality
- Optional metadata JSON file alongside downloaded media
- Custom output directory and format selection
- Context support for cancellation and timeouts

Changes:
- Improved video format selection with fallback chain

Closes #2