feat: suppression individuelle de releases dans les available downloads

Ajoute DELETE /available-downloads/:id?release=N pour supprimer une
release spécifique du JSON array (supprime l'entrée série si c'est
la dernière). Bouton trash sur chaque release dans la page downloads.

Corrige aussi le parsing des ranges de volumes sans préfixe sur le
second nombre (T17-23 détecte maintenant T17 à T23).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/backoffice/app/(app)/downloads/DownloadsPage.tsx

@@ -198,7 +198,7 @@ export function DownloadsPage({ initialDownloads, initialLatestFound, qbConfigur
             </h2>
             <div className="space-y-6">
               {latestFound.map(lib => (
-                <AvailableLibraryCard key={lib.library_id} lib={lib} />
+                <AvailableLibraryCard key={lib.library_id} lib={lib} onDeleted={() => refresh(false)} />
               ))}
             </div>
           </div>
@@ -342,11 +342,23 @@ function DownloadRow({ dl, onDeleted }: { dl: TorrentDownloadDto; onDeleted: ()
   );
 }
 
-function AvailableLibraryCard({ lib }: { lib: LatestFoundPerLibraryDto }) {
+function AvailableLibraryCard({ lib, onDeleted }: { lib: LatestFoundPerLibraryDto; onDeleted: () => void }) {
   const { t } = useTranslation();
   const [collapsed, setCollapsed] = useState(true);
+  const [deletingKey, setDeletingKey] = useState<string | null>(null);
   const displayResults = collapsed ? lib.results.slice(0, 5) : lib.results;
 
+  async function handleDeleteRelease(seriesId: string, releaseIdx: number) {
+    const key = `${seriesId}-${releaseIdx}`;
+    setDeletingKey(key);
+    try {
+      const resp = await fetch(`/api/available-downloads/${seriesId}?release=${releaseIdx}`, { method: "DELETE" });
+      if (resp.ok) onDeleted();
+    } finally {
+      setDeletingKey(null);
+    }
+  }
+
   return (
     <Card>
       <CardHeader className="pb-3 px-3 sm:px-6">
@@ -390,8 +402,8 @@ function AvailableLibraryCard({ lib }: { lib: LatestFoundPerLibraryDto }) {
                         </div>
                       </div>
                     </div>
-                    {release.download_url && (
-                      <div className="self-end sm:self-auto shrink-0">
+                    <div className="flex items-center gap-1 self-end sm:self-auto shrink-0">
+                      {release.download_url && (
                         <QbittorrentDownloadButton
                           downloadUrl={release.download_url}
                           releaseId={`${r.id}-${idx}`}
@@ -400,8 +412,19 @@ function AvailableLibraryCard({ lib }: { lib: LatestFoundPerLibraryDto }) {
                           expectedVolumes={release.matched_missing_volumes}
                           allVolumes={release.all_volumes}
                         />
-                      </div>
-                    )}
+                      )}
+                      <button
+                        type="button"
+                        onClick={() => handleDeleteRelease(r.id, idx)}
+                        disabled={deletingKey === `${r.id}-${idx}`}
+                        className="inline-flex items-center justify-center w-6 h-6 rounded text-muted-foreground hover:text-destructive hover:bg-destructive/10 transition-colors disabled:opacity-30"
+                        title={t("downloads.delete")}
+                      >
+                        {deletingKey === `${r.id}-${idx}`
+                          ? <Icon name="spinner" size="sm" className="animate-spin" />
+                          : <Icon name="trash" size="sm" />}
+                      </button>
+                    </div>
                   </div>
                 ))}
               </div>