feat: add admin risk actions and arbitration settlement

backend/internal/modules/order/dto.go

@@ -45,6 +45,15 @@ type SubmitReturnRequest struct {
 	Content string `json:"content" binding:"required"`
 }
 
+type AdminActionRequest struct {
+	Reason string `json:"reason" binding:"required"`
+}
+
+type AuditMeta struct {
+	IP        string
+	UserAgent string
+}
+
 type HandoffRecordDTO struct {
 	ID                  uint64     `json:"id"`
 	OrderID             uint64     `json:"order_id"`