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>

web/src/app/wanted/wanted-client.tsx

@@ -65,6 +65,20 @@ export function WantedClient() {
     refresh();
   }
 
+  async function ignore(w: Wanted) {
+    const res = await fetch(`/api/releases/${w.id}`, {
+      method: "PATCH",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ ignored: true }),
+    }).catch(() => null);
+    if (res?.ok) {
+      setRows((list) => list.filter((x) => x.id !== w.id));
+      toast(`Ignoring ${w.album} — un-ignore from the artist’s discography`);
+    } else {
+      toast(`Couldn't ignore ${w.album}`);
+    }
+  }
+
   return (
     <div>
       <PageHead title="Wanted" eyebrow="Cutting list · acquire & upgrade" />
@@ -109,6 +123,9 @@ export function WantedClient() {
                 <button className="btn sm ghost" onClick={() => searchNow(w)}>
                   Search now
                 </button>
+                <button className="btn sm ghost" onClick={() => ignore(w)}>
+                  Ignore
+                </button>
               </div>
             </li>
           ))}