Check if a subdomain is available for use.
Request to check if a subdomain is available.
Attributes: subdomain: The subdomain to check (e.g., 'my-app' for my-app.apps.rebolt.ai).
Successful Response
Response indicating whether a subdomain is available.
Attributes: available: Whether the subdomain is available. subdomain: The subdomain that was checked. full_domain: The full domain that would be created (e.g., my-app.apps.rebolt.ai).