feat: 添加订单详情和退款功能，更新用户角色管理，增强超级管理员鉴权

backend/app/services/order.go

@@ -417,6 +417,66 @@ func (s *order) SuperOrderPage(ctx context.Context, filter *superdto.OrderPageFi
 	}, nil
 }
 
+// SuperOrderDetail 平台侧订单详情（跨租户）。
+func (s *order) SuperOrderDetail(ctx context.Context, orderID int64) (*superdto.SuperOrderDetail, error) {
+	if orderID <= 0 {
+		return nil, errorx.ErrInvalidParameter.WithMsg("order_id must be > 0")
+	}
+
+	tbl, query := models.OrderQuery.QueryContext(ctx)
+	orderModel, err := query.Preload(tbl.Items).Where(tbl.ID.Eq(orderID)).First()
+	if err != nil {
+		return nil, err
+	}
+
+	var tenantLite *superdto.OrderTenantLite
+	if orderModel.TenantID > 0 {
+		tTbl, tQuery := models.TenantQuery.QueryContext(ctx)
+		tenantModel, err := tQuery.Where(tTbl.ID.Eq(orderModel.TenantID)).First()
+		if err != nil {
+			return nil, err
+		}
+		tenantLite = &superdto.OrderTenantLite{ID: tenantModel.ID, Code: tenantModel.Code, Name: tenantModel.Name}
+	}
+
+	var buyerLite *superdto.OrderBuyerLite
+	if orderModel.UserID > 0 {
+		uTbl, uQuery := models.UserQuery.QueryContext(ctx)
+		userModel, err := uQuery.Where(uTbl.ID.Eq(orderModel.UserID)).First()
+		if err != nil {
+			return nil, err
+		}
+		buyerLite = &superdto.OrderBuyerLite{ID: userModel.ID, Username: userModel.Username}
+	}
+
+	return &superdto.SuperOrderDetail{
+		Order:  orderModel,
+		Tenant: tenantLite,
+		Buyer:  buyerLite,
+	}, nil
+}
+
+// SuperRefundOrder 平台侧发起退款（跨租户）。
+func (s *order) SuperRefundOrder(
+	ctx context.Context,
+	operatorUserID, orderID int64,
+	force bool,
+	reason, idempotencyKey string,
+	now time.Time,
+) (*models.Order, error) {
+	if operatorUserID <= 0 || orderID <= 0 {
+		return nil, errorx.ErrInvalidParameter.WithMsg("operator_user_id/order_id must be > 0")
+	}
+
+	tbl, query := models.OrderQuery.QueryContext(ctx)
+	orderModel, err := query.Where(tbl.ID.Eq(orderID)).First()
+	if err != nil {
+		return nil, err
+	}
+
+	return s.AdminRefundOrder(ctx, orderModel.TenantID, operatorUserID, orderID, force, reason, idempotencyKey, now)
+}
+
 // PurchaseContentParams 定义“租户内使用余额购买内容”的入参。
 type PurchaseContentParams struct {
 	// TenantID 租户 ID（多租户隔离范围）。