add movies and tv show library types with Jellyfin NFO support

- Add `movies` type: per-movie folders with video files, poster/backdrop
  images, and optional Jellyfin NFO metadata (title, year, plot, rating,
  genres, runtime). Grid view with 2:3 poster art, detail modal with play
  and two-click delete of the movie folder.
- Add `tv` type: Series -> Season -> Episode hierarchy with lazy loading at
  each level. Reads tvshow.nfo and episodedetails NFO files for metadata.
  Episode grid with video thumbnails, streams via existing video player.
  Delete is limited to the entire series folder to avoid breaking Jellyfin.
- Add fast-xml-parser dependency for Kodi/Jellyfin NFO parsing (lib/nfo.ts)
- Migrate existing DB to expand the libraries CHECK constraint to include
  the two new types; migration is idempotent and preserves existing data.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/libraries/route.ts

@@ -26,7 +26,7 @@ export async function POST(request: NextRequest) {
     return NextResponse.json({ error: 'name, path, and type are required' }, { status: 400 })
   }
 
-  const validTypes: LibraryType[] = ['games', 'mixed']
+  const validTypes: LibraryType[] = ['games', 'mixed', 'movies', 'tv']
   if (!validTypes.includes(type as LibraryType)) {
     return NextResponse.json({ error: `type must be one of: ${validTypes.join(', ')}` }, { status: 400 })
   }