Delete user-role assignment

Deletes a user-role assignment and responds 204 No Content. Removing an Administrator assignment is blocked with 403 when fewer than two active Administrators would remain; a caller lacking delete permission also receives 403.

curl -X DELETE "https://example.com/v1/user-roles/497f6eca-6276-4993-bfeb-53cbbbba6f08"

{
  "status": 400,
  "message": "Role name cannot be empty"
}

{
  "status": 401,
  "message": "Unauthorized"
}

{
  "status": 403,
  "message": "Cannot remove Administrator role. At least 2 active administrators must remain to prevent system lockout."
}

{
  "status": 404,
  "message": "Role not found"
}

{
  "status": 500,
  "message": "server_error"
}