What changed
- Added a bundled cookie-free Douyin download engine based on the proven DouK request flow.
- Users only provide an authorized Douyin URL; no separate downloader, Edge/Chrome Cookie, Windows DPAPI access, or ChatGPT browser extension is required.
- Kept yt-dlp as an automatic fallback.
- Added offline downloader contracts, end-to-end link verification, doctor visibility, and explicit GPL-3.0 third-party notices.
No paid avatar, voice, or transcription tasks were submitted during release verification.