Mattias Tall 98d986cd95 Fix cookie fallback breaking yt-dlp in Docker; add OAuth2 auth flow ...

- _cookie_args() no longer falls through to --cookies-from-browser when
  cookies_file is configured but missing. Firefox isn't installed in the
  Docker image, so that fallback caused yt-dlp to exit with empty stdout
  and every metadata fetch to return "Video not found on YouTube".
- fetch_video_metadata() now retries without auth args if the first call
  fails, so a broken cookie config can't block public video fetches.
- Add use_oauth2 setting + full device-auth flow (POST /settings/oauth2-init,
  GET /settings/oauth2-status) with OAuth2Section UI in Settings page.
- Add GET /settings/ytdlp-test diagnostics endpoint.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-26 09:53:02 +02:00

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