docs(llms): add Auxen provider configuration example

[ai-auxen]

Adds an Auxen accordion to the Provider Configuration Examples section on `docs/en/concepts/llms.mdx`, following the same shape as the existing Fireworks AI / Nebius AI Studio entries.

Auxen hosts per-customer dedicated LLM endpoints (Llama 3.1/3.2, Qwen 2.5, Mistral, Gemma 2, Mixtral, Phi-3, Command R) with an OpenAI-compatible `/v1/chat/completions` API. Each instance is a dedicated GPU billed per-minute of runtime — no token charges, no monthly minimums.

Because Auxen instances are OpenAI-wire-compatible, the example uses LiteLLM's `openai/` model prefix with a custom `base_url` — works with the current CrewAI install.

Companion PRs (Auxen distribution series)

• BerriAI/litellm#28532 — LiteLLM provider (once merged, CrewAI users can also use the `auxen/` LiteLLM prefix directly)
• vercel/ai#15536 — Vercel AI SDK community provider
• langchain-ai/docs#4146 — LangChain docs (Python + JS)
• run-llama/llama_index#21764 — LlamaIndex Python
• continuedev/continue#12473 — Continue.dev provider
• cline/cline#10988 — Cline OpenAI-compatible quickstart
• Helicone/helicone#5685 — Helicone gateway
• langfuse/langfuse-docs#2990 — Langfuse provider page
• npm: `@auxen/ai-sdk-provider` (live)

AI agent (Claude) assisted in drafting this PR.

Summary by CodeRabbit

• Documentation
  • Added Auxen provider documentation with setup instructions, required environment configuration, and integration examples for using Auxen as an LLM provider.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c8e0bee3-a427-4d70-9467-96541714d8f9

📥 Commits

Reviewing files that changed from the base of the PR and between 306f598 and b1d772a.

📒 Files selected for processing (1)

• docs/en/concepts/llms.mdx

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📝 Walkthrough

Walkthrough

A new Auxen LLM provider section is added to the LLM concepts documentation, covering environment configuration, instantiation example using OpenAI-compatible endpoints, key features, and LiteLLM setup requirements.

Changes

LLM Provider Documentation

Layer / File(s)	Summary
Auxen provider documentation docs/en/concepts/llms.mdx	New accordion section documents Auxen LLM provider with environment variable configuration (AUXEN_API_BASE, AUXEN_API_KEY), code example showing LLM instantiation with openai/ prefix, base_url, and api_key, feature bullets, and LiteLLM dependency guidance.

Estimated Code Review Effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A new provider joins the fold,
Auxen's docs in detail told,
Configuration clear and bright,
LiteLLM shining in the light!
One accordion, perfectly aligned. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs(llms): add Auxen provider configuration example' directly and clearly summarizes the main change—adding Auxen provider documentation to the LLM concepts file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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