Fix #180: Handle unsupported response_format parameter for non-OpenAI providers

[ChinmayShringi]

Problem

Ontology generation fails with 500 error when using LLM providers like Groq that don't support the OpenAI-specific response_format={"type": "json_object"} parameter.

Root Cause

The code uses response_format={"type": "json_object"} which is an OpenAI-specific feature. When using Groq or other providers that don't support this parameter, the API call fails with a 500 error.

Solution

Added graceful fallback logic in three files:

1. llm_client.py - Core LLM client with automatic retry without response_format
2. simulation_config_generator.py - Direct API calls with fallback
3. oasis_profile_generator.py - Direct API calls with fallback

When a 400/500 error related to response_format is detected, the code automatically retries without the parameter and relies on the system prompt to enforce JSON output format.

Testing

• Tested with Groq API (llama-3.1-8b-instant, llama-3.2-1b-preview, llama-3.1-70b-versatile)
• Backwards compatible with OpenAI API
• No breaking changes to existing functionality

Fixes #180

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Original PR: 666ghj/MiroFish#186
Original Author: @hkc5