feat: 新增退款凭证

src/types/api/refund.ts

@@ -26,6 +26,7 @@ export interface Refund {
   actual_received_amount: number // 实收金额（分）
   status: RefundStatus
   refund_reason: string
+  refund_voucher_key?: string // 退款凭证 file_key，多个以英文逗号分隔
   reject_reason: string
   remark: string
   asset_reset: boolean
@@ -62,6 +63,7 @@ export interface CreateRefundRequest {
   order_id: number
   requested_refund_amount: number // 申请退款金额（分）
   actual_received_amount: number // 实收金额（分）
+  refund_voucher_key: string // 退款凭证对象存储 file_key，多个以英文逗号分隔
   refund_reason?: string
 }