Use when the user provides a Bilibili URL (BV number) and wants LaTeX course notes rendered as PDF. Triggers: Bilibili link, BV号, 'B站视频笔记', '整理B站课'. Falls back to Whisper when no CC subtitles.
Use when the user provides a YouTube URL and wants LaTeX course notes rendered as PDF. Triggers: YouTube link, '这个视频', '整理这节课', 'YouTube 笔记'.
Use when the user provides a URL to a web article, blog post, or X Article and wants LaTeX notes rendered as PDF. Triggers: article/blog URL, '整理这篇文章', '文章笔记'. Handles translation detection (traces back to original).