[glasstiger]

Summary

• Document OIDC device-flow sign-in and rotating bearer-token providers for C/C++ and Rust 7.3.0+, and Python 6.1.0+, with language-specific examples.
• Cover discovery, issuer pinning, scopes, silent refresh, token persistence, provider ownership, error handling, and shutdown. Include Python notebook support, managed identities, and PGWire adapters.
• Replace obsolete unsupported-authentication claims and align the shared OIDC, connection-string, and QWP behavior references with the new provider and reconnect behavior.
• Update connection-setup guidance to reflect eager pool initialization and where authentication failures surface.

Related implementation PRs: questdb/c-questdb-client#228 and questdb/py-questdb-client#165.

[github-actions]

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