List operational-administrator roles for the Account

curl -X GET "https://auth.canopy-io.com/portal/v1/accounts/{accountSlug}/admin-roles" \
  -H "Authorization: Bearer $CANOPY_TOKEN"

{
  "items": [
    {
      "id": "string",
      "name": "string",
      "description": "string",
      "is_system": false,
      "system_key": "string",
      "is_active": false,
      "scope": "account",
      "capabilities": [
        "string"
      ],
      "assignment_count": 0,
      "created_at": "2026-04-20T12:00:00.000Z",
      "updated_at": "2026-04-20T12:00:00.000Z"
    }
  ]
}