Separate steps for openai_conversation options flow

[Shulyaka]

Proposed change

Break down the OpenAI options flow into 3 separate screens:

1. Basic settings (prompt, llm_api)
2. Advanced settings (only if the user did not select "recommended settings" on step 1)
3. Model-specific settings (reasoning effort, search tool)

The format of the config entry itself is not changed.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [x] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

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[home-assistant[bot]]

Hey there @balloob, mind taking a look at this pull request as it has been labeled with an integration (openai_conversation) you are listed as a code owner for? Thanks!

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[Shulyaka]

[frenck]

Oh hi 👋

There seems to be a merge conflict, could you take a look?

../Frenck

[Shulyaka]

Done!