fix: 讓 /{lang}/index.json 回傳字詞串列 (close #124)#125
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/a、/t、/h、/c 的 index.json 原本會被當成一般詞彙查詢，導致 404
（萌典閃卡使用的 /c/index.json 即受影響）。在 handleLanguageSubRoute
中加入 text === 'index' 的特例，直接回傳 R2 的 {lang}/index.json，
與 /api/index/{lang}.json 對齊。
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
字詞串列原本以壓縮 JSON 回傳，全部擠在一行。改為 pretty 格式 （JSON.stringify(payload, null, 2)），每個詞彙獨立一行、逗號後換行， 排版較易閱讀。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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問題
以下四個路由原本應回傳字詞串列，但目前會被當成一般詞彙「index」查詢，查不到即回 404：
/a/index.json/t/index.json/h/index.json/c/index.json其中
/c/index.json為萌典閃卡所使用，目前回傳 404。修法（最小更動）
字詞串列其實已存在於 R2 的
{lang}/index.json，並已透過/api/index/{lang}.json對外提供。本 PR 在handleLanguageSubRoute加入text === 'index'的特例，直接回傳 R2 的{lang}/index.json，行為與/api/index/{lang}.json對齊（找不到時回 404）。測試
/{lang}/index.json四個語系回傳陣列（tests/integration/api-index-xref-search.test.ts）tests/unit/api-handlers-direct.test.ts，符合 CLAUDE.md 對 handler 分支需 direct-call 覆蓋的要求）驗證：
typecheck✅、lint✅、test:unit（856 passed，覆蓋率 ratchet 維持）✅、test:integration（74 passed）✅Close #124
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