feat(i18n): complete English translation + full-stack bilingual support (en/zh-CN)#296

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hackingbutlegal wants to merge 11 commits into666ghj:mainfrom

hackingbutlegal:feat/localize-en

Commits on Mar 22, 2026

i18n: translate entire codebase from Chinese to English

graffito
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docs: add i18n design spec and implementation plan

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feat(i18n): add backend locale middleware, message catalog, and prompt loader

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feat(i18n): add vue-i18n setup, language switcher, and Accept-Language header

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feat(i18n): extract API messages to locale-aware message catalog

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feat(i18n): extract view strings to vue-i18n locale files

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feat(i18n): extract LLM prompts to locale-specific template files

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feat(i18n): extract component strings to vue-i18n locale files

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feat(i18n): merge component keys into main en.json

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feat(i18n): add Chinese translations for frontend UI and backend API messages

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feat(i18n): add Chinese LLM prompt translations from git history

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