feat: bulk video uploads and S3 asset video support (#18)

Add multi-file drag-and-drop queues for project videos and the assets pane, and route asset video uploads through S3/R2 when direct Bunny uploads are disabled.

app/watch/[videoId]/page.tsx

@@ -1,6 +1,7 @@
 import { VideoPageContent } from '@/components/video-page-content';
 import { ShareLinkBootstrap } from '@/components/share-link-bootstrap';
 import { ShareLinkUnlock } from '@/components/share-link-unlock';
+import { isS3VideoUploadsEnabled } from '@/lib/feature-flags';
 
 interface WatchPageProps {
   params: Promise<{ videoId: string }>;
@@ -19,5 +20,11 @@ export default async function WatchPage({ params, searchParams }: WatchPageProps
     return <ShareLinkUnlock videoId={videoId} />;
   }
 
-  return <VideoPageContent mode="watch" videoId={videoId} />;
+  return (
+    <VideoPageContent
+      mode="watch"
+      videoId={videoId}
+      directUploadProvider={isS3VideoUploadsEnabled() ? 'r2' : 'bunny'}
+    />
+  );
 }