feat: Minstrel no longer talks to Lidarr: its connection, Delete via Lidarr and the unmonitor options are gone, and the track reports are plain quarantine (M502 #5525)

Migration 0091 drops lidarr_config and renames the quarantine tables, types,
indexes and the history column off the Lidarr name. The Integrations Lidarr
card, the Reports "Delete via Lidarr" action, the merge and remove-track
unmonitor options, the Lidarr audit actions and error codes go, on the
server, web and Android. The README describes acquisition as it is now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/reacquisition/settings.go

@@ -1,6 +1,6 @@
 // Package reacquisition wants an album back when its files go missing,
-// without anyone pressing anything (milestone #290; a want rather than a
-// Lidarr request since M502 #5520).
+// without anyone pressing anything (milestone #290; a want since M502
+// #5520).
 //
 // The unit of work is the ALBUM, not the track. Music is acquired as
 // releases; there is no meaningful "fetch me one track", and a recording