feat: blocklist & search button for import-pending downloads with caution

- Poller now stores _instanceKey alongside _instanceUrl on Sonarr/Radarr queue records
- dashboard route threads arrQueueId/arrType/arrInstanceUrl/arrInstanceKey/arrContentId/arrContentType as admin-only fields on downloads with importIssues
- POST /api/dashboard/blocklist-search: admin-only, removes queue item with blocklist=true then triggers EpisodeSearch/MoviesSearch
- Button renders in download card header (admin + importIssues + arrQueueId only)
- Confirm dialog, loading/success/error states on the button
- Kicks a background poll on success so SSE reflects removed item promptly

server/utils/poller.js

@@ -160,8 +160,11 @@ async function pollAllServices() {
       records: sonarrQueues.flatMap(q => {
         const inst = sonarrInstances.find(i => i.id === q.instance);
         const url = inst ? inst.url : null;
+        const key = inst ? inst.apiKey : null;
         return (q.data.records || []).map(r => {
           if (r.series) r.series._instanceUrl = url;
+          r._instanceUrl = url;
+          r._instanceKey = key;
           return r;
         });
       })
@@ -175,8 +178,11 @@ async function pollAllServices() {
       records: radarrQueues.flatMap(q => {
         const inst = radarrInstances.find(i => i.id === q.instance);
         const url = inst ? inst.url : null;
+        const key = inst ? inst.apiKey : null;
         return (q.data.records || []).map(r => {
           if (r.movie) r.movie._instanceUrl = url;
+          r._instanceUrl = url;
+          r._instanceKey = key;
           return r;
         });
       })