Get default DNS config for an organization
Retrieves the default DNS configuration for the specified organization.
If the organization has its own default DNS config, it is returned directly.
If not, the config is resolved by walking up the organization hierarchy (inheritance).
When the config is inherited from a parent organization, the response includes the `inherited_from_organisation_id` field.
The `dns_id` references a DNS configuration object that can be retrieved or created via the [`/api/v1/dns`](/developers/api/service-lookups-and-configuration/dns-get) endpoints.