c8cdcb4631
PR Test / lint (pull_request) Successful in 1s
- Add _normalize_metadata() to flatten nested metadata structure
- Fix generate_frontmatter() to use correct metadata fields
- Change _sanitize_filename() to return standardized "bilibili_{bvid}" format
Fixes: analysis.md frontmatter showing "未命名"/0/"未知" instead of actual values
Fixes: audio filename using video title instead of platform_bvid format
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>