新功能(#26): 拆分退款日志查询接口

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

apis/public/user.api

@@ -141,6 +141,23 @@ type (
 		List  []WithdrawalLog `json:"list"`
 		Total int64           `json:"total"`
 	}
+	QueryCommissionReturnLogRequest {
+		Page int `form:"page"`
+		Size int `form:"size"`
+	}
+	CommissionReturnLog {
+		Id        int64  `json:"id"`
+		UserId    int64  `json:"user_id"`
+		Amount    int64  `json:"amount"`
+		EventType uint16 `json:"event_type"`
+		Content   string `json:"content"`
+		CreatedAt int64  `json:"created_at"`
+		UpdatedAt int64  `json:"updated_at"`
+	}
+	QueryCommissionReturnLogResponse {
+		List  []CommissionReturnLog `json:"list"`
+		Total int64                 `json:"total"`
+	}
 	GetDeviceOnlineStatsResponse {
 		WeeklyStats       []WeeklyStat      `json:"weekly_stats"`
 		ConnectionRecords ConnectionRecords `json:"connection_records"`
@@ -384,10 +401,14 @@ service ppanel {
 	@handler CancelWithdrawal
 	post /withdrawal_cancel (CancelWithdrawalRequest) returns (WithdrawalLog)
 
-	@doc "Query Withdrawal Log"
+	@doc "Query Withdrawal Log (biz_type=commission_refund deprecated, use /commission_return_log)"
 	@handler QueryWithdrawalLog
 	get /withdrawal_log (QueryWithdrawalLogListRequest) returns (QueryWithdrawalLogListResponse)
 
+	@doc "Query Commission Return Log"
+	@handler QueryCommissionReturnLog
+	get /commission_return_log (QueryCommissionReturnLogRequest) returns (QueryCommissionReturnLogResponse)
+
 	@doc "Device Online Statistics"
 	@handler DeviceOnlineStatistics
 	get /device_online_statistics returns (GetDeviceOnlineStatsResponse)
@@ -447,3 +468,4 @@ service ppanel {
 	@handler DeviceWsConnect
 	get /device_ws_connect
 }
+