docs: Add Anthropic Vertex AI documentation

[usnavy13]

Summary

Adds documentation for Anthropic Vertex AI support introduced in danny-avila/LibreChat#10780.

This allows running Anthropic Claude models through Google Cloud Vertex AI with:

• Azure-style model name mapping (visible name → Vertex AI deployment name)
• YAML-based configuration with environment variable fallback
• Service account authentication via Google Cloud

Changes

• Updated pages/docs/configuration/pre_configured_ai/anthropic.mdx with Vertex AI quick start section
• Created pages/docs/configuration/librechat_yaml/object_structure/anthropic_vertex.mdx with detailed YAML configuration docs
• Updated pages/docs/configuration/librechat_yaml/object_structure/_meta.ts navigation

Documentation Highlights

Quick Setup (Environment Variables)

ANTHROPIC_USE_VERTEX=true
ANTHROPIC_VERTEX_REGION=global
GOOGLE_SERVICE_KEY_FILE=/path/to/service-account.json

Advanced YAML Configuration

endpoints:
  anthropic:
    vertex:
      enabled: true
      region: global
      models:
        claude-opus-4.5:
          deploymentName: claude-opus-4-5@20251101
        claude-sonnet-4:
          deploymentName: claude-sonnet-4-20250514

Related

• Feature PR: 🤖 feat: Anthropic Vertex AI Support danny-avila/LibreChat#10780

[vercel]

@usnavy13 is attempting to deploy a commit to the LibreChat's projects Team on Vercel.

A member of the Team first needs to authorize it.

[danny-avila]

I removed the requirement of vertex.enabled to follow the principle of "configuration by presence" which is more intuitive, the docs should just be updated for this

[usnavy13]

I removed the requirement of vertex.enabled to follow the principle of "configuration by presence" which is more intuitive, the docs should just be updated for this

Updated!