- Pass quality parameter to /tracks/{track_id}/download-info API request
- Add GetTrackDownloadURL method that resolves signed download URLs by
downloading XML from download_info_url, parsing host/path/ts/s,
computing MD5 signature (salt: XGRlBW9FXlekgbPrRHuSiA), and
returning https://{host}/get-mp3/{sign}/{ts}{path}
- Add DownloadInfoURL field to DownloadInfo model for the XML URL
- Update DownloadTrack to use GetDirectLink resolution when URL is empty
- Port signing logic from yandex-music-api-python download_info.py
- Document all exported types, functions, methods, and constants across 52 files
- Add package-level doc comments to client, models, utils, and ynison packages
- Document HTTP method and endpoint path for each API client method
- Document model struct fields and DeJSON/DeList/ToJSON/ToMap methods
- Fix duplicate package doc comment in internal/models/base.go
Co-Authored-By: Claude Code <noreply@anthropic.com>