feat: add 5 Chinese authoritative data sources (2026-04-22 AM)#167

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feat/add-china-sources-20260422-am

Apr 22, 2026

Commits on Apr 22, 2026

feat: add 5 Chinese authoritative data sources (research/science focus)
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fix: replace duplicate china-scidb (already in PR#165) with china-ioz
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