- backend: new GET /api/song-sorttags reads TITLESORT/ARTISTSORT/ALBUMARTISTSORT/ ALBUMSORT directly from the file via ffprobe - ui.js: pre-fill sort fields from romaji index, then overwrite with real file tags from the backend (shows actual values even if manually set) - index.html: remove redundant hint texts in settings Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>