docs: clarify llms-full.txt behavior on authenticated sites

[mintlify]

Summary

Updates llms.txt and authentication docs to reflect new auth-aware behavior for llms-full.txt: fully authenticated sites no longer serve the file (returns 404), and partially authenticated sites only include public pages.

Changes

• Rewrote the authentication note on the llms.txt page to break down behavior for public, partially authenticated, and fully authenticated sites.
• Updated the feature availability table on the authentication setup page so the llms.txt and llms-full.txt row reflects the new behavior in each mode.
• Mirrored the same updates across the es, fr, and zh translations.

Context

The upstream change updates the llms-full.txt route to fetch from a new client controller that enforces auth rules: fully authenticated deployments 404, and partially authenticated deployments expose only public content (even to logged-in viewers). The previous docs implied both modes simply gated the files behind login.

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Note

Low Risk
Low risk documentation-only change; no runtime code or configuration behavior is modified.

Overview
Clarifies in ai/llmstxt.mdx (and es/fr/zh translations) how llms.txt/llms-full.txt behave under public, partially authenticated, and fully authenticated deployments, including that fully authenticated sites return 404 for llms-full.txt and partially authenticated sites include only public pages.

Updates the authentication docs’ Feature availability table (deploy/authentication-setup.mdx and translations) to match this new behavior, and refreshes the Spanish/French page descriptions to be more specific about supported auth methods.

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