Admin-only page to move videos from AWS Glacier cold storage back to
hot storage. Kicks off a scoped S3 restore, polls until ready, then
reuploads via the existing hot-storage path and emails the requester.
Poller is gated by IS_PRIMARY so multi-server deployments don't race.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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