feat(db): payments 拆为 subscriptions 与 topups
订阅权益与充值入账分表;topups 对齐上游充值单(无 quota_granted), paid_at=complete_time;quota_derived 查询层派生。
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订阅权益与充值入账分表;topups 对齐上游充值单(无 quota_granted), paid_at=complete_time;quota_derived 查询层派生。