tiproxy: info about API access restrictions (#21865)

[ti-chi-bot]

This is an automated cherry-pick of #21865

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the TiProxy documentation by adding a crucial section on API access control. The new content guides users on securing their TiProxy API endpoints, offering methods such as TLS client certificate verification and network-level firewall rules. This ensures that users have clear instructions on how to protect their TiProxy deployments from unauthorized access.

Highlights

• API Access Control Documentation: Added a new section to the TiProxy API documentation detailing how to implement access control.
• TLS-based Restriction: Explained how to restrict API access using TLS by enabling server-http-tls and configuring the cert-allowed-cn option for client certificate verification.
• Firewall Rules: Provided guidance on using firewall rules as an alternative access control mechanism when TLS is not enabled.

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[gemini-code-assist]

Code Review

This PR adds useful information about restricting access to the TiProxy API. I've suggested a small change to improve the clarity and accuracy of the new text. Otherwise, the change looks good.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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