Discord-reported (winecountrygames + fresh.dumbledore): "Import only
makes Albums folder no singles or eps". Users with a
${albumtype}s/$albumartist/... album_path template saw an "Albums"
folder fill up correctly but never any "Singles" or "EPs" folder.
build_import_album_info detected an album using
``total_tracks > 1`` AND ``album_name != track_title``. Spotify
singles fail both — total_tracks is 1 and the album is usually
named after the song. The result was that staging/auto-import
routed singles through single_path, which doesn't honour
$albumtype, so the user's per-type folder layout never applied.
Now also treats the metadata source's explicit release-type
classification ("single", "ep", "compilation") as evidence that
this is an album-shaped release, so it routes through album_path
and the user's $albumtype substitution runs. The default fallback
value "album" is deliberately excluded from this check so
single-track downloads with no real metadata behave exactly as
before.
Adds 10 regression tests covering the reported scenario, EP and
compilation explicit types, and three guards: normal multi-track
albums still detected, default 'album' type falls through, and
empty/unknown types fall through.