feat: add Astraflow provider support

[ucloudnb666]

Summary

Adds Astraflow (by UCloud) as a supported LLM provider to Strix documentation.

Changes

• Added Astraflow provider documentation (docs/llm-providers/astraflow.mdx)
• Added Astraflow card to provider overview page
• Added Astraflow to navigation in docs.json

About Astraflow

Astraflow is an OpenAI-compatible AI model aggregation platform by UCloud supporting 200+ models. It provides both global and China endpoints:

• Global endpoint: https://api-us-ca.umodelverse.ai/v1
• China endpoint: https://api.modelverse.cn/v1
• Website: https://astraflow.ucloud-global.com (global) / https://astraflow.ucloud.cn (China)

Since Astraflow is OpenAI-compatible, it works through Strix's existing LiteLLM integration without requiring code changes—users just need to configure the base URL and API key.

[greptile-apps]

Greptile Summary

This PR adds Astraflow to the Strix LLM provider docs.

• New Astraflow provider setup page.
• New navigation entry in docs/docs.json.
• New Astraflow card on the provider overview page.

Confidence Score: 4/5

The documentation route looks valid, but the Astraflow setup example can give users a model value that does not route correctly.

• The new page is reachable from the docs navigation and overview card.
• The setup examples diverge from the existing OpenAI-compatible provider pattern.
• Users copying the bare model name can hit LiteLLM provider/model resolution errors.

docs/llm-providers/astraflow.mdx

Important Files Changed

Filename	Overview
docs/docs.json	Adds the Astraflow provider page to the LLM provider navigation.
docs/llm-providers/astraflow.mdx	Adds Astraflow setup instructions, but the model examples use bare names instead of the provider-qualified format used by sibling OpenAI-compatible docs.
docs/llm-providers/overview.mdx	Adds an Astraflow card that links to the new provider page.

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
docs/llm-providers/astraflow.mdx:13
**Bare Model Skips Provider Routing**

When users copy this setup, `gpt-5.4` is passed as an unqualified LiteLLM model while the endpoint is configured through `LLM_API_BASE`. The sibling OpenAI-compatible docs use `openai/...` values for this path, so this example can fail provider/model resolution instead of routing the request to Astraflow.

_{Reviews (1): Last reviewed commit: "feat: add Astraflow provider support" | Re-trigger Greptile}

[greptile-apps]

Bare Model Skips Provider Routing

When users copy this setup, gpt-5.4 is passed as an unqualified LiteLLM model while the endpoint is configured through LLM_API_BASE. The sibling OpenAI-compatible docs use openai/... values for this path, so this example can fail provider/model resolution instead of routing the request to Astraflow.

Prompt To Fix With AI

This is a comment left during a code review.
Path: docs/llm-providers/astraflow.mdx
Line: 13

Comment:
**Bare Model Skips Provider Routing**

When users copy this setup, `gpt-5.4` is passed as an unqualified LiteLLM model while the endpoint is configured through `LLM_API_BASE`. The sibling OpenAI-compatible docs use `openai/...` values for this path, so this example can fail provider/model resolution instead of routing the request to Astraflow.

How can I resolve this? If you propose a fix, please make it concise.

[bearsyankees]

marketing it seems? but happy to accept real PRs