SpotifyBU 1.6.2

SpotifyBU 1.6.2

SpotifyBU 1.6.2 restores Navidrome-first product language after the generic
music-library wording in the 1.6.x cleanup made the intended target less clear.

Changed

• README, Docker examples, and .env.docker.example now present
  NAVIDROME_* variables as the natural setup path for Navidrome installs.
• UI and API status messages now refer to the Navidrome folder, Navidrome API,
  Navidrome scans, and Navidrome playlist syncs where that is what users are
  configuring.
• The generic MUSIC_LIBRARY_* names remain accepted equivalents for existing
  installs and non-Navidrome Subsonic-compatible setups.
• Direct non-Docker installs can now use NAVIDROME_MUSIC_PATH as another alias
  for the local music folder path.

Verified

• TypeScript check passes with tsc --noEmit.
• Production build passes with next build.
• Unit tests pass with npm test.