fix: should not redirect when page is visited by bot

[chenjiahan]

Summary

When the request comes from a bot (such as Google's crawler), Rspress should not redirect the page.

This change should fix the "Page with redirect" warning of Google:

The RegExp is referenced from https://www.npmjs.com/package/isbot

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[zoolsher]

LGTM