新增退款待审核角标提醒

backend/internal/modules/order/handler_admin.go

@@ -248,6 +248,15 @@ func (h *Handler) ListPendingRefund(c *gin.Context) {
 	response.OK(c, gin.H{"items": items})
 }
 
+func (h *Handler) PendingRefundCount(c *gin.Context) {
+	count, err := h.service.PendingRefundCount(c.Request.Context())
+	if err != nil {
+		writeOrderError(c, err)
+		return
+	}
+	response.OK(c, gin.H{"pending_refund_count": count})
+}
+
 func (h *Handler) adminAction(c *gin.Context, fn func(context.Context, uint64, uint64, AdminActionRequest, AuditMeta) error, okData gin.H) {
 	adminID, ok := currentAdminID(c)
 	if !ok {

backend/internal/modules/order/refund_review.go

@@ -2,6 +2,8 @@ package order
 
 import (
 	"context"
+
+	"hfb_sys/backend/internal/model"
 )
 
 // ListPendingRefund 查询所有待客服审核退款的订单。
@@ -26,3 +28,13 @@ func (r *Repository) ListPendingRefund(ctx context.Context) ([]OrderDTO, error)
 	}
 	return items, nil
 }
+
+// PendingRefundCount 返回待客服审核退款数量，用于后台导航角标。
+func (r *Repository) PendingRefundCount(ctx context.Context) (int64, error) {
+	var count int64
+	err := r.db.WithContext(ctx).
+		Model(&model.RentalOrder{}).
+		Where("refund_status = ?", refundStatusPendingReview).
+		Count(&count).Error
+	return count, err
+}

backend/internal/modules/order/service.go

@@ -351,6 +351,13 @@ func (s *Service) ListPendingRefund(ctx context.Context) ([]OrderDTO, error) {
 	return s.repo.ListPendingRefund(ctx)
 }
 
+func (s *Service) PendingRefundCount(ctx context.Context) (int64, error) {
+	if s.repo == nil {
+		return 0, ErrDependencyUnavailable
+	}
+	return s.repo.PendingRefundCount(ctx)
+}
+
 func (s *Service) FindForUser(ctx context.Context, userID uint64, orderID uint64) (*OrderDTO, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable