Update project subdomain

Request to update the subdomain for a project.

Attributes: subdomain: The new subdomain (e.g., 'my-app' for my-app.apps.rebolt.ai).

Response after updating a project's subdomain.

Attributes: success: Whether the update was successful. subdomain: The new subdomain. full_domain: The full domain URL. deployment_url: The URL where the project will be accessible.