Clarify Livestream API access is whitelist-based

[mintlify]

The Livestream API is gated behind a whitelist, not restricted to the Enterprise plan. Updates getting-started, authentication, introduction, scheduled broadcasts overview, and the access form page to remove Enterprise-only language. Requested by Michael Rosinsky in Slack.

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Requested by: mrosinsky@x.ai via Slack
Mintlify session: slack_1790269610.838869_C09MQDT6BM4

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[mintlify]

Docs PR opened: #458

Added a Sep 24, 2026 changelog entry saying Livestream API access now goes to whitelisted apps, not only Enterprise plans.