feat(i18n): full Simplified Chinese localization (mechanism + UI + lesson bodies)#241

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JerryC8080 wants to merge 7 commits into

rohitg00:mainfrom

JerryC8080:feat/simplified-chinese-i18n

Commits on Jun 1, 2026

feat(i18n): pluggable site internationalization layer (English-only by default)
JerryC8080
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feat(i18n): add Simplified Chinese (zh) locale overlay
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docs(i18n): add Simplified Chinese README (README.zh.md) + language nav
JerryC8080
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docs(zh): add Simplified Chinese lesson bodies (473 docs/zh.md)
JerryC8080
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feat(i18n): localize lesson quizzes — quiz.zh.json fallback + zh built-in quizzes
JerryC8080
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i18n(zh): translate 55 lesson quizzes (275 questions) to quiz.zh.json
JerryC8080
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i18n(zh): translate mermaid diagram labels in 157 lesson zh.md
JerryC8080
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