docs: document llms.txt scoped proxy routes

[dks333]

Summary

• explain that large generated llms.txt files use scoped indexes under /_llms/*
• document the reverse-proxy and granular path-allowlist requirements, including base paths
• clarify that Mintlify-managed custom domains need no additional configuration

Testing

• mint broken-links

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Note

Low Risk
Documentation-only changes with no runtime or security impact.

Overview
Updates llms.txt docs to match how large sites are handled today: instead of describing truncation and omitted entries at the 100,000-character cap, it explains that Mintlify splits the generated index into linked files under /_llms/ so agents can discover all pages without one huge file.

Adds operator guidance for reverse proxies and path allowlists—forward /_llms/* alongside /llms.txt, use <base-path>/_llms/* when docs sit under a base path, and note that Mintlify-managed custom domains need no extra setup—with a cross-link to the reverse-proxy page.

On Reverse proxy, clarifies that /docs/* already covers /docs/_llms/*, and that granular allowlists must explicitly include /docs/_llms/* so index links from /docs/llms.txt remain reachable.

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