feat(invoice): 統一發票對獎 (stage C item 1)#74
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新工具「發票對獎」＋全站第二支 serverless function。 - src/lib/invoice.ts：財政部 invoice.xml 解析與對獎規則（TDD，17 tests）。 漸進式對獎：末 3 碼即可確判「沒中」或六獎／增開六獎， 頭獎末碼系列逐碼升級，特別獎／特獎需 8 碼全中才確認。 號碼全程字串處理，前導零不掉。 - api/invoice-numbers.ts：代抓財政部公開 RSS（固定網址、免金鑰、 無使用者輸入故無 SSRF 面），CDN 快取 s-maxage=3600 + SWR 一天。 - src/tools/InvoiceLottery.tsx：期別切換、開獎號碼卡、即時對獎、 錯誤重試；中英雙語頁面，tools.ts 註冊（實用工具 🧧）。 - OG 卡：npm run og 產出 zh/en 兩張（68 張，og.test 守門），已目測。 - e2e：stub /api/invoice-numbers，涵蓋載入、快篩沒中、增開六獎、 8 碼頭獎、期別切換、API 掛掉重試（+3）。 測試：typecheck:api ✓ / 530 unit ✓（+17）/ 57 e2e ✓（+3） 合併後需立即驗 production /api/invoice-numbers（preview 在 SSO 後面）。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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摘要
階段 C 第 1 項（HANDOFF 待辦，回訪黏性最高）：發票對獎 —— 自動抓財政部最新
開獎號碼，輸入末 3 碼立刻知道有沒有中，補到 8 碼確認獎級。全站第二支 serverless function。
資料源
財政部公開 RSS
https://invoice.etax.nat.gov.tw/invoice.xml（免金鑰、含近六期號碼）。固定網址、無使用者輸入 → 無 SSRF 面，不需要走 ssrfGuard。
開獎兩個月一次，CDN 快取
s-maxage=3600, stale-while-revalidate=86400。對獎規則（
src/lib/invoice.ts，TDD 17 tests）對中頭獎末碼 → 當下獎級已確定、提示續輸可能升級；只對中特別獎／特獎末碼 → 提示補完 8 碼確認
00507588）驗證
typecheck:api✓ / 530 unit ✓（+17）/ 57 e2e ✓（+3，stub API：載入、快篩沒中、增開六獎、8 碼頭獎、期別切換、API 掛掉重試）
og.test.ts守門）並依教訓 feat(bingo): bring bingo game into master #3 目測過兩張新卡api/，preview 部署在 Vercel SSO 後面，合併後須立即實打 production
/api/invoice-numbers驗證（回傳期別數、號碼格式、快取標頭）🤖 Generated with Claude Code