chore: reduce log noise by changing frequent commands to debug level
Move high-frequency API read commands from log::info! to log::debug!:
- get_artist, get_artist_detail, get_artist_tracks, get_artist_albums
- get_featured_albums, get_genres
- get_user_playlists, get_playlist, search_playlists
- get_favorites, get_tracks_by_ids, get_track_info, get_current_user_id
- playlist_get_all_settings, playlist_get_all_stats
- playlist_get_all_local_track_counts, get_playlist_folders
User action commands (create, delete, add, remove) remain at info level.