fix: supprime le layout shift des boutons qBittorrent au chargement

La config qBittorrent est maintenant récupérée côté serveur et passée
en prop au QbittorrentProvider, évitant le fetch client qui causait
l'apparition tardive des boutons de téléchargement.

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

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

@@ -3,10 +3,20 @@ import { DownloadsPage } from "./DownloadsPage";
 
 export const dynamic = "force-dynamic";
 
+async function isQbConfigured(): Promise<boolean> {
+  try {
+    const data = await apiFetch<{ url?: string; username?: string }>("/settings/qbittorrent");
+    return !!(data && data.url?.trim() && data.username?.trim());
+  } catch {
+    return false;
+  }
+}
+
 export default async function Page() {
-  const [downloads, latestFound] = await Promise.all([
+  const [downloads, latestFound, qbConfigured] = await Promise.all([
     fetchTorrentDownloads().catch(() => [] as TorrentDownloadDto[]),
     apiFetch<LatestFoundPerLibraryDto[]>("/download-detection/latest-found").catch(() => [] as LatestFoundPerLibraryDto[]),
+    isQbConfigured(),
   ]);
-  return <DownloadsPage initialDownloads={downloads} initialLatestFound={latestFound} />;
+  return <DownloadsPage initialDownloads={downloads} initialLatestFound={latestFound} qbConfigured={qbConfigured} />;
 }