OAuth2 password-grant client for PeerTube API with token caching and
auto-refresh on 401. Pushes domain categories via PUT /api/v1/videos/{uuid}.
Includes limit parameter on push_pending for staged rollouts, and
systemic failure detection that aborts after 5 consecutive failures
(catches missing plugin or broken auth before wasting API calls).
Config section added to config.yaml for PeerTube API connection
parameters. Real credentials remain in .env (gitignored).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
