fix: 修复兑换码生成后复制全部报错

[wucm667]

背景

• Fixes 兑换码生成后全部复制报错 Wei-Shaw/sub2api#2334
• 兑换码生成结果弹窗点击“复制全部”时，原逻辑直接调用 navigator.clipboard.writeText，在非安全上下文或不支持 Clipboard API 的环境会报错。

修改

• 将“复制全部”接入项目已有 useClipboard composable。
• 保留复制成功后的按钮状态反馈，并复用已有降级复制与提示逻辑。

测试

• pnpm typecheck
• pnpm test:run src/composables/__tests__/useClipboard.spec.ts
• pnpm exec eslint src/views/admin/RedeemView.vue

备注

• 全量 pnpm test:run 在当前 main 基础上仍有 13 个既有失败，失败集中在 AccountUsageCell、图表组件、EmailVerifyView 等，与本次改动无关。

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[wucm667]

已改为提交到 upstream 仓库：Wei-Shaw#2448