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

internal/handler/public/user/queryWithdrawalLogHandler.go

@@ -8,7 +8,7 @@ import (
 	"github.com/perfect-panel/server/pkg/result"
 )
 
-// Query Withdrawal Log
+// Query Withdrawal Log (biz_type=commission_refund deprecated, use /commission_return_log)
 func QueryWithdrawalLogHandler(svcCtx *svc.ServiceContext) func(c *gin.Context) {
 	return func(c *gin.Context) {
 		var req types.QueryWithdrawalLogListRequest