/download-video now delegates to the ReClip service (its own yt-dlp) and runs as
a background job: POST returns a jobId immediately and the client polls
GET /download-video/:jobId, so a large download no longer holds one long request
open (which was 504-ing behind the reverse proxy). the finished file is streamed
into the user's folder with a title-based name.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
pastilhasandClaude Opus 4.8
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