Description

This PR adds support for OpenAI's reasoning API feature.

1. Reasoning Integration

   • Added support for reasoning_effort parameter in API calls
   • Created new UI component ReasoningEffortSelect for controlling reasoning effort level
   • Updated model configs to include latest o1 and o3-mini models with 200k context windows

2. UI/UX Improvements

   • Dynamic UI controls that adapt based on model selection:
     • Show reasoning controls for 'o' OpenAI models (excluding o1-preview and o1-mini)
     • Show temperature/top_p controls for other models

Screenshots

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