docs: add branding config and disableProviderUpload per-endpoint field

[shqear93]

Summary

Documentation updates accompanying the implementation PR: danny-avila/LibreChat#12622

• New page: branding object structure — documents the new branding config block with fields for appLogo, authLogo, favicon, meta, and theme (light/dark RGB token maps)
• Updated: fileConfig object structure — adds disableProviderUpload field under endpoint config

Changes

New

• content/docs/configuration/librechat_yaml/object_structure/branding.mdx — full branding block reference with examples
• Registered in meta.json under the General section

Modified

• content/docs/configuration/librechat_yaml/object_structure/file_config.mdx

  • Added disableProviderUpload to the endpoints overview list
  • Added ## disableProviderUpload section with description, default, and YAML example

• content/docs/configuration/librechat_yaml/object_structure/interface.mdx

  • Removed hideProviderUploadForEndpoints section

Config shape (new branding block)

branding:
  appLogo: "https://cdn.example.com/logo.svg"
  authLogo: "https://cdn.example.com/auth-logo.svg"
  favicon: "https://cdn.example.com/favicon.ico"
  meta:
    title: "My AI Assistant"
    description: "Powered by LibreChat"
  theme:
    light:
      primary: "210 100% 40%"
      background: "0 0% 100%"
    dark:
      primary: "210 100% 60%"
      background: "222 20% 10%"

Config shape (disableProviderUpload)

fileConfig:
  endpoints:
    litellm:
      disableProviderUpload: true
    custom:
      disableProviderUpload: true
    openAI:
      disableProviderUpload: true

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[chatgpt-codex-connector]

Restrict default fallback claim to non-assistants endpoints

This note says default applies to all endpoints without their own entry, but the same page already documents that the assistants endpoint does not use default settings. As written, operators can set disableProviderUpload under default expecting Assistants to inherit it, and then ship a config that leaves provider uploads enabled for Assistants unexpectedly.

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