feat: add 5 Chinese government data sources (AM batch, 2026-04-21)#165

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feat/add-china-sources-20260421-am

Commits on Apr 21, 2026

feat: add 5 Chinese government data sources (AM batch, 2026-04-21)
firstdata-dev
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fix: replace duplicate china-cqc (already in PR#164) with china-catarc
firstdata-dev
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fix: correct china-cdb data_url (deep path 404→root)
firstdata-dev
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