fix(orders): drop secondary "我的余额/会员/积分" link from detail modal

The user center already has a dedicated tab for these; showing the
secondary shortcut inside the order detail modal is redundant noise.
The view-model field is kept for other consumers.

assets/js/order-center.js

@@ -610,9 +610,6 @@
         if (actions.can_view_product && order.permalink) {
             footer += '<a class="btn-ghost" href="' + escapeHtml(order.permalink) + '">查看商品</a>';
         }
-        if (order.secondary_url && order.secondary_label) {
-            footer += '<a class="btn-ghost" href="' + escapeHtml(order.secondary_url) + '">' + escapeHtml(order.secondary_label) + "</a>";
-        }
         if (footer === "") {
             footer = '<button type="button" class="btn-outline" data-aksrt-order-detail-close>关闭</button>';
         }