release-8.5: translate AI doc changes from pingcap/docs release-8.5 on 2026-04-17 (#21569)

[ti-chi-bot]

This is an automated cherry-pick of #21569

What is changed, added or deleted? (Required)

Translate pingcap/docs AI documentation changes (ai/** and TOC-ai.md) to Chinese via ai-pr-translator commit-diff sync.

English commit diff:

pingcap/docs@b746912...3ef0c51

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

• release-8.5

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

• Source repo: pingcap/docs
• Source branch: release-8.5
• Source paths: ai/**, TOC-ai.md

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

[ti-chi-bot]

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