让凭证数组与套餐作废任务进入可联调状态

Constraint: 后端订单套餐作废接口使用 /api/admin/order-package-invalidate-tasks，上传
  purpose 只能使用 attachment。
  Rejected: 继续提交逗号拼接凭证字符串 | 新提交路径必须使用 string[]，历史字符串只做读取归一化。
  Confidence: high
  Scope-risk: broad
  Directive: 新增订单套餐作废权限时需同时配置菜单 URL 与
  order_package_invalidate_task:create/detail 按钮权限。
  Tested: bun run build；development 真实后端联调上传、创建、列表、详情通过；复机接口未触发。
  Not-tested: 未逐一手工覆盖所有历史凭证数据、全部角色权限组合和所有文件扩展名预览

openspec/changes/update-refund-voucher-multi-image/tasks.md

@@ -4,7 +4,7 @@
 - [x] 1.2 Add click-to-preview/enlarge behavior for refund detail voucher images.
 - [x] 1.3 Add `payment_status: 2` to the order number search/select request used by create refund application.
 - [x] 1.4 Update refund management voucher upload to allow multiple image uploads.
-- [x] 1.5 Submit uploaded voucher file keys joined by English commas in `refund_voucher_key`.
+- [x] 1.5 Submit uploaded voucher file keys as `string[]` in `refund_voucher_key`; do not submit comma-separated strings for new records.
 - [x] 1.6 Validate that at least one voucher image is uploaded before submission when voucher is required.
 - [x] 1.7 Verify refund detail display, order selector filtering, and multi-image payload behavior.
 - [x] 1.8 Allow requested refund amount `0` while blocking negative and over-actual amounts.