Add broadcast chat moderator endpoints

[mintlify]

Adds three new endpoints to the Livestream API "Live Chat" section:

• GET /2/broadcasts/chat/moderators — list broadcast moderators
• POST /2/broadcasts/chat/moderators — add a broadcast moderator
• DELETE /2/broadcasts/chat/moderators/{id} — remove a broadcast moderator

Changes:

• New MDX pages under livestream-api/chat/ for each endpoint
• Added pages to the "Live Chat" group in docs.json
• Added paths, request/response schemas, and security (OAuth 2.0 user + OAuth 1.0a) in openapi.json
• Each page calls out the 20-moderator-per-user limit

---

Generated by Mintlify Agent.

Requested by: mrosinsky@x.ai via Slack
Mintlify session: slack_1789510355.629879_C09MQDT6BM4

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated
x-corp	🟢 Ready	View Preview	Sep 15, 2026, 10:17 PM

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[mintlify]

Docs PR opened: #417

Added a Sep 15, 2026 Livestream API changelog entry announcing the new broadcast chat moderator list, add, and remove endpoints.