fix(vip): add spacing before points exchange notice

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Content/VipServiceModal.php

@@ -250,7 +250,7 @@ trait VipServiceModal {
         // （参考主题源码写作 `!$min_val > $user_points`，因运算符优先级恒假，
         //  此处按其原意取真实比较，保证提示分支可达。）
         if ($min_points > $user_points) {
-            $form = '<div class="badg c-red btn-block">' . esc_html__('积分不足，暂时无法兑换', 'aksrt') . '</div>';
+            $form = '<div class="mt20"><div class="badg c-red btn-block">' . esc_html__('积分不足，暂时无法兑换', 'aksrt') . '</div></div>';
         } else {
             $form = '<div class="mt20">'
                 . '<input type="hidden" name="product_id" value="' . $first_package_id . '">'