Add two new YouTube adapters:
- **youtube video**: fetch metadata (title, views, description, etc.) from ytInitialPlayerResponse and ytInitialData
- **youtube transcript**: fetch subtitles via Android InnerTube API to bypass PoToken requirement on Web client caption URLs
- Two output modes: --mode grouped (sentence merging, speaker detection, chapter headings) and --mode raw (precise sub-second timestamps)
- CJK support with 30s time-window fallback for unpunctuated captions
- Language selection with --lang and stderr warning on fallback
- URL normalization for watch, youtu.be, shorts, embed, live formats
Co-authored-by: Ji Zhang <jizhang.work@gmail.com>
Ji
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