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拆分用户中心退款日志查询: - 新增 GET /v1/public/user/commission_return_log(333/337/338) - 旧 GET /v1/public/user/withdrawal_log?biz_type=commission_refund 复用新逻辑做兼容 - 默认 withdrawal_log 行为不变(仍查 withdrawals 表) - 单测覆盖 333/337/338 happy path、坏 JSON 跳过、object_id 隔离、handler 级 HTTP 响应 父 issue: HIF-25 子 issue: HIF-26