GitLab

- New docs/livekit-load-testing-guide.md: official doc links, CLI install,
  env setup (LIVEKIT_URL / API key / secret, incl. reading them from the
  deployment .env and the deliberate LIVEKIT_WS_URL -> LIVEKIT_URL rename)
- How to list live meetings (lk room list) and map a meeting to its LiveKit
  room name (meeting_<uuid>, authoritative via meetings.livekit_room_name)
- Full lk load-test parameter table taken verbatim from --help (v2.17.0)
- Ready-made 10/20/30/50/100 subscriber / video-publisher / mixed / audio-only
  runs, joining an existing meeting, codec + simulcast variations
- Result interpretation, server-side watching, cleanup; safety warnings
  (never load-test prod, run the tester off-box)
- Linked from README.md docs index for quick reference

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