fix/deprecated-model-name

[wyzBelinda]

Summary

• The demo UI fails with a 404 because the code contains a hardcoded deprecated model name gpt-3.5-turbo-0301.
• This PR fixes the immediate failure and makes the model configurable via an environment variable for future-proofing.

What I changed

• Replaced occurrences of gpt-3.5-turbo-0301 with gpt-3.5-turbo.
• Added a small configuration helper lida/config.py with:
  • DEFAULT_MODEL = "gpt-3.5-turbo"
  • get_model() which reads LIDA_MODEL env var and falls back to DEFAULT_MODEL
• Updated docs with docs/model.md describing LIDA_MODEL usage.

Why

• OpenAI has deprecated the older model name; hardcoding it breaks the demo for new users.
• Making the model configurable allows users/maintainers to change the model without modifying code.

Testing / verification

1. Checkout branch and install requirements.
2. Run the UI:
   pip install -U llmx openai
   lida ui --port=8080 --docs
3. Open Demo -> movies.json and confirm no 404 error.
4. (Optional) Set LIDA_MODEL to a different valid model and confirm the app uses it.
5. Run the test suite (if present) and ensure tests pass.

Notes / follow-ups

• If maintainers prefer a different default model, we can update DEFAULT_MODEL before merging.
• If the repository already has a config system, the helper can be integrated with it instead of using an env var.

[wyzBelinda]

@microsoft-github-policy-service agree

[wyzBelinda]

@microsoft-github-policy-service agree

…

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