退款审核功能：待交接取消不再自动退款，改为客服审核后原路退回

- 租客在待交接状态取消订单不再自动退款，改为 refund_status=pending_review
- 新增退款审核页面 /admin/orders/refund-review，客服可逐个审核
- 新增 POST /refund/approve 通过退款、POST /refund/reject 驳回退款
- 新增 GET /orders/refund-pending 查询待审核退款订单列表
- 优化状态标签表述：已取消→租客已取消、已关闭→客服已关闭、异常→客服介入
- 新增 refund_status: pending_review 及其前端标签「待客服审核退款」
- AdminOrderDetailView 退款状态改用统一 refundStatusLabel

backend/internal/modules/order/admin_actions.go

@@ -2,6 +2,7 @@ package order
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	"hfb_sys/backend/internal/model"
@@ -356,6 +357,50 @@ func (r *Repository) buildRefundStatusDTO(order *model.RentalOrder) *RefundStatu
 	}
 }
 
+// AdminApproveRefund 客服审核通过退款申请，触发渠道原路退款。
+func (r *Repository) AdminApproveRefund(ctx context.Context, orderID uint64) error {
+	var refund *refundAction
+	err := r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var order model.RentalOrder
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&order, orderID).Error; err != nil {
+			return err
+		}
+		if order.RefundStatus != refundStatusPendingReview {
+			return errors.New("订单不处于待审核退款状态")
+		}
+		if order.RefundAmountCent <= 0 {
+			return errors.New("退款金额无效")
+		}
+		action, err := r.prepareRefund(&order, order.RefundAmountCent, refundBizCancel, "取消订单原路退款（客服审核通过）")
+		if err != nil {
+			return err
+		}
+		refund = action
+		return tx.Save(&order).Error
+	})
+	if err != nil {
+		return err
+	}
+	r.startRefundBestEffort(ctx, refund)
+	return nil
+}
+
+// AdminRejectRefund 客服驳回退款申请，清除退款状态和金额。
+func (r *Repository) AdminRejectRefund(ctx context.Context, orderID uint64) error {
+	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var order model.RentalOrder
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&order, orderID).Error; err != nil {
+			return err
+		}
+		if order.RefundStatus != refundStatusPendingReview {
+			return errors.New("订单不处于待审核退款状态")
+		}
+		order.RefundStatus = "none"
+		order.RefundAmountCent = 0
+		return tx.Save(&order).Error
+	})
+}
+
 func isTerminalStatus(status string) bool {
 	return status == orderStatusCompleted || status == orderStatusCancelled || status == orderStatusClosed
 }