Get a Product Variant By Id

{
    "meta": {
        "success": true,
        "status": 200,
        "message": "Berhasil mendapatkan detail varian produk dengan informasi diskon"
    },
    "data": {
        "product": {
            "id": "4c91401f-c067-46e8-aeb5-fc0715bffc0a",
            "name": "Mobil Balap Merah"
        },
        "variant": {
            "id": "f04475f5-8c7a-4006-b765-6806308e074b",
            "name": "Hitam - L",
            "originalPrice": 90000,
            "finalPrice": 81000,
            "discountAmount": 9000,
            "discountPercentage": 10,
            "hasDiscount": true,
            "activeDiscount": {
                "id": "785e461d-9046-4fb7-adf3-4b8d6109ccb0",
                "discountType": "PERCENTAGE",
                "discountValue": 10,
                "isActive": true,
                "startDate": "2025-10-15T17:00:00.000Z",
                "endDate": "2025-12-30T17:00:00.000Z"
            },
            "stock": 18,
            "variantSku": "VAR-TOKOSE-251016-2EF6679C",
            "imageUrl": "public/product-variant/6cec1038-e0c7-4751-bdcb-fed7270ba499-1760618777434-b993b9.jpg",
            "createdAt": "2025-10-16T12:46:19.133Z",
            "updatedAt": "2025-10-16T12:46:19.133Z"
        }
    }
}