Permanently removes a flow's start form.Unlike the other endpoints in this domain, the identifier in the path here is the form's own identifier (startFormId), not the flow's — this is the only endpoint in the domain that does not include the flow identifier in the path.After removal, the flow is left without an entry form: new cards can no longer be created from the public form until a new start form is configured.This is a destructive, irreversible operation. Before removing it, we recommend checking for dependencies that may reference fields of this form: card-creation triggers with conditions on form fields, credit or decision engines using form fields as input, and document templates referencing those fields.