docs: note OpenAI client base_url for multi-model gateways

[seven7763]

Summary

Clarify that the OpenAI Python client base_url pattern works with OpenAI-compatible multi-model gateways when not using the default provider endpoint, using DaoXE (https://api.daoxe.com/v1) as one concrete example.

Docs only — no runtime behavior changes.

Test plan

• Docs render
• Existing examples unchanged
• Tip is clearly optional

Co-Authored-By: Claude Fable 5 noreply@anthropic.com

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider clarifying what "OpenAI-compatible multi-model gateway" means (e.g., API-compatible with OpenAI’s REST/SDK interface) to reduce ambiguity for readers unfamiliar with the term.
• You might want to align the new tip’s formatting and wording with other tips in this doc (e.g., shorter sentence, less marketing-style UTM parameters on the DaoXE link) for consistency and neutrality.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider clarifying what "OpenAI-compatible multi-model gateway" means (e.g., API-compatible with OpenAI’s REST/SDK interface) to reduce ambiguity for readers unfamiliar with the term.
- You might want to align the new tip’s formatting and wording with other tips in this doc (e.g., shorter sentence, less marketing-style UTM parameters on the DaoXE link) for consistency and neutrality.

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