- Introduce `songUploadSchema` for flexible uploads where title/artist are optional
- Add `extractAudioMetadata()` to parse ID3/Vorbis tags and embedded cover art from uploaded files
- Merge form values with extracted metadata, falling back to filename-derived title if needed
- Automatically write embedded cover art to `media/covers/` when no manual cover is uploaded
- Update song form UI to indicate optional fields and tag-based fallback behavior
- Switch JSON rendering in partials from `<%-` (unescaped) to `<%=`, improving safety
Brian Fertig