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

1. Implementation

• 1.1 Update refund detail to render voucher images inline when voucher keys exist.
• 1.2 Add click-to-preview/enlarge behavior for refund detail voucher images.
• 1.3 Add payment_status: 2 to the order number search/select request used by create refund application.
• 1.4 Update refund management voucher upload to allow multiple image uploads.
• 1.5 Submit uploaded voucher file keys joined by English commas in refund_voucher_key.
• 1.6 Validate that at least one voucher image is uploaded before submission when voucher is required.
• 1.7 Verify refund detail display, order selector filtering, and multi-image payload behavior.
• 1.8 Allow requested refund amount 0 while blocking negative and over-actual amounts.