## Summary
- The conversation transcript endpoint rate limit is hardcoded at 30
requests/hour per account with no way to override it
- Self-hosted users with active accounts hit this limit and get 429
errors across all channels
- Add `RATE_LIMIT_CONVERSATION_TRANSCRIPT` env var (default: `1000`) to
make it configurable, consistent with other throttles like
`RATE_LIMIT_CONTACT_SEARCH` and `RATE_LIMIT_REPORTS_API_ACCOUNT_LEVEL`
