feat(qbz-qt): fill the Album and Artist pages from the integrations

The two pages were missing most of what Slint shows. With MusicBrainz, Last.fm
and ListenBrainz wired this round, the sections that depend on them can exist:
the artist biography and network, relationship rows, listener figures and the
credit blocks the Slint pages carry.

Nothing is faked. A section whose data an integration cannot supply is absent
rather than an empty frame, and a section fed by an integration the user has
not connected degrades to absent without a network call — integrations stay
strictly opt-in. The relationship rows are non-navigable for now because
resolving a musician name to a catalog artist needs a bridge invokable that is
not there yet; an informational row is better than a dead click.

cc

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