[Sandeep85Das]

Adds a custom endpoint guide for OptiQ Cloud, an OpenAI-compatible chat completions API at https://cloud.mlx-optiq.com/api/v1. It follows the NEAR AI Cloud guide (#668).

Changes:

• content/docs/configuration/librechat_yaml/ai_endpoints/optiq-cloud.mdx: the new page, with the .env key, the endpoints.custom entry and notes on reasoning effort.
• content/docs/configuration/librechat_yaml/ai_endpoints/meta.json: adds the page after openrouter.
• content/docs/configuration/librechat_yaml/ai_endpoints/index.mdx: adds a card under "Other compatible endpoints".
• components/icons/providers/optiq.tsx and components/icons/providers/index.ts: an OptiQIcon that uses currentColor.
• lib/icons.tsx: maps OptiQ to the icon.

The four models are glm-5.3-flash, deepseek-v4.1-flash, minimax-m3.1-flash and glm-5.3. Their prices and context windows are at GET https://cloud.mlx-optiq.com/api/v1/models, which needs no key.

The guide sets fetch: false and lists the four chat models. Each model takes reasoning_effort (minimal to xhigh, and none on DeepSeek V4.1 Flash only), and the page explains how to pass it with addParams.

Docs: https://mlx-optiq.com/docs/cloud/api and https://mlx-optiq.com/docs/cloud/frameworks

I made this in GitHub's web editor and couldn't build the site locally. I matched the NEAR AI PR file for file, checked that meta.json parses, and checked the TSX against the existing icon components. I'll fix anything the preview or CI flags.

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