feat(library): ignore a release (do-not-monitor)

Add MonitoredRelease.ignored (migration add_release_ignored). The monitor's
enqueue_due skips ignored releases, and they drop off the Wanted list —
independent of `monitored`, so auto-monitor-future can't silently re-grab
an album the user chose to ignore.

- Worker enqueue_due: AND NOT mr.ignored.
- /api/releases/[id] PATCH now accepts `ignored`; /api/wanted filters it out;
  artist detail exposes `ignored`.
- UI: Ignore button on Wanted rows; discography shows an "Ignored" badge with
  an Ignore/Un-ignore toggle (monitor + search disabled while ignored).

Worker + web tests added.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/lyra_worker/monitor.py

@@ -121,6 +121,7 @@ def enqueue_due(conn: psycopg.Connection, cfg: MonitorConfig) -> int:
             '   AND mr."firstGrabbedAt" < now() - make_interval(days => %s)) AS window_expired '
             'FROM "MonitoredRelease" mr '
             'WHERE mr.monitored = true '
+            '  AND NOT mr.ignored '  # user-ignored releases are never enqueued
             "  AND mr.state <> 'fulfilled' "
             '  AND (mr."lastSearchedAt" IS NULL '
             '       OR mr."lastSearchedAt" < now() - make_interval(hours => %s)) '