cloud: document IPv6 support for Dedicated private endpoint connections

[xboxeer]

What is changed, added or deleted? (Required)

Document inbound IPv6 support for TiDB Cloud Dedicated private endpoint connections over AWS PrivateLink:

• tidb-cloud/set-up-private-endpoint-connections.md: add a "Use IPv6 connectivity over a private endpoint" section, which covers:
  • inbound IPv6 access over AWS PrivateLink is enabled on request through PingCAP Technical Support;
  • the IP protocol type is configured per node group and can only be changed after the cluster is created (on the cluster's Networking page, click Edit in the AWS Private Endpoints panel and select Dual Stack (IPv4 + IPv6));
  • creating an AWS interface endpoint with the Dualstack IP address type, including the --ip-address-type dualstack flag to append to the generated AWS CLI command;
  • switching the IP protocol type back to IPv4 Only requires deleting all private endpoints that use IPv6 connectivity first.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Added instructions for using IPv6 connectivity with private endpoint connections.
  • Documented how to enable IPv6 support and create an AWS interface endpoint with Dualstack IP addressing.
  • Clarified that selected subnets must include both IPv4 and IPv6 CIDR blocks.
  • Added steps for completing the private endpoint connection and connecting over IPv6.

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• tidb-cloud/set-up-private-endpoint-connections.md

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📝 Walkthrough

Walkthrough

The private endpoint guide now documents IPv6 connectivity over AWS PrivateLink, including IPv6 enablement, dual-stack endpoint configuration, subnet requirements, and connection steps.

Changes

IPv6 private endpoint connectivity

Layer / File(s)	Summary
Document IPv6 endpoint configuration tidb-cloud/set-up-private-endpoint-connections.md	Documents IPv6 enablement through PingCAP Technical Support and dual-stack configuration for private endpoint connections.
Document IPv6 interface endpoint creation tidb-cloud/set-up-private-endpoint-connections.md	Documents the Dualstack setting, dual-stack subnet requirements, the AWS CLI option, and the remaining connection steps.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: documenting IPv6 support for Dedicated private endpoint connections.
Description check	✅ Passed	The description explains the documentation changes, identifies the affected TiDB version, records AI involvement, and addresses the applicable template sections. The omitted first-time contributor che…

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• tidb-cloud/set-up-private-endpoint-connections.md

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