picks the most DOWNLOADABLE release, not just the biggest/fastest:
- peer_availability() mirrors the music side's scoring — free upload slot, tiered
upload speed, graduated queue penalty.
- group_video_files now captures queueLength, picks the best PEER per release by
(availability, then speed) instead of speed alone, and ranks hits by availability.
- _evaluate_hits sorts by (accepted, quality score, availability, size) so within a
quality tier a free-slot/empty-queue source wins over one stuck behind a 1500-deep
queue — fixes the downloads that sat at 0%.
queue/speed also surfaced on results for the UI. tested.
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