Creates a new chat session for the authenticated user. The session ID should be used in subsequent send-message requests via the x-session-id header.
Chat session created successfully
Chat session ID (may be UUID or legacy string format)
"123e4567-e89b-12d3-a456-426614174000"
personal, organization, public web, cli, internal-cli, api, slack, discord, telegram, schedule, unknown, null