Second album-page row sourced from Last.fm: the album's primary artist ->
artist.getSimilar -> one top album per similar artist, resolved to Qobuz and
deduped against the Qobuz /album/suggest row (by artist|title and by id).
Gated on Last.fm being connected; resolved row cached per album for 30 days
(re-opens make zero API calls; only non-empty results cached so a transient
failure re-fetches). New build_similar_albums_seeded in qbz-external-reco.
reset_album now also clears this row so the previous album's recommendations
don't linger while the next loads.
cc