Antalya 26.5: address OAuth security audit#1958

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feature/antalya-26.5/pr-1777

Commits on Jun 24, 2026

Cherry-pick of https://github.com/Altinity/ClickHouse/pull/1777 with unresolved conflict markers (resolution in next commit)
zvonand
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Resolve conflicts in cherry-pick of #1777 onto antalya-26.5

zvonand
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claude
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