ContractStepOneRequest

{
    "contract": {
        "institution_id": 1,
        "start_date": "2025-12-30",
        "end_date": "2025-12-31",
        "start_time": "09:00",
        "end_time": "17:00",
        "contract_contact_persons_attributes": [
            {
                "name": "John Doe",
                "phone": "+6281234567890"
            }
        ]
    }
}