该接口用于查询账户所有币种的全量现金数据。无需传入账号或币种参数,接口直接返回各币种下的已结算现金 settled_cash 与可用现金 available_cash,数据结构以币种为键组织。与账户现金查询接口相比,该接口返回全量数据且不支持币种筛选。This interface is used to retrieve the complete cash data across all currencies for the account. Without requiring an account number or currency parameter, it directly returns the settled cash settled_cash and available cash available_cash for each currency, organized by currency as the key. Compared to the account cash query interface, this interface returns full data without currency filtering support.