Note

Low Risk
Documentation-only copy change with no impact on runtime behavior or security logic.

Overview
Adds a new <Warning> callout on the authentication-setup.mdx page clarifying that authentication only works on custom domains or Mintlify subdomains and is not supported when deploying docs under a custom basepath (e.g., example.com/docs).

Applies the same clarification to the localized Spanish, French, and Chinese versions, including locale-correct links to the basepath docs.

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