docs: add Dynoyard endpoint guide

[jeremyrx7]

Summary

Adds a Dynoyard custom endpoint guide under the LibreChat YAML AI endpoints docs. Dynoyard is an OpenAI-compatible gateway for open-weight models, with routing and failover across the providers that serve them.

The example uses:

• DYNOYARD_KEY
• https://<your-org>.dynoyard.app/v1 — each account has its own subdomain, so the reader substitutes their workspace slug, similar to the Azure page
• kimi-k3 as the default model and qwen-plus-3-7 for titleModel
• models.fetch: true so LibreChat can load the live model list from /v1/models, which the gateway serves in the OpenRouter response shape

Also adds the provider icon and the meta.json sidebar entry. Locale files are left alone so translate_docs.yml can generate them.

Testing

• pnpm typecheck
• pnpm exec prettier --check on the five changed files
• pnpm exec eslint --max-warnings 0 on the three TS files
• pnpm build — compiled successfully, 2891 static pages generated, and dynoyard.html renders with the icon SVG inline
• curl -s https://jeremy.dynoyard.app/v1/models | jq -e '.data | map(.id) | contains(["kimi-k3","glm-5-2","qwen-max-3-7","minimax-m3"])' — confirms every model ID named in the page is really served

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