QuotaDetailResponse

{
    "code": 0,
    "msg": "success",
    "data": [
        {
            "feature_group": "audit",
            "items": [
                "合同审查"
            ],
            "quota": 100,
            "used_cost": 30,
            "avail_balance": 70,
            "avail_days": 60,
            "expire_date": "2026-05-31",
            "billing_mode": "per_call",
            "rate": 1,
            "unit_size": 10000,
            "sub_features": [
                {
                    "sub_feature": "compare-ocr",
                    "rate": 6
                }
            ]
        }
    ]
}