- Add complete audio transcriptions for Chapters 13 & 14 with pinyin
- Use transcription API to auto-transcribe Chapter 14 audio files
- Add raw transcription files for Chapter 13
- Add VIDEOTOMP3_API.md documentation
- Add Xiezuo Chapter 4 and XiezuoClass materials
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
