Refactor chat handling and model integration: Update .env.example to include new API keys, modify main.py to implement a lifespan context manager for resource management, and replace Message class with dictionary structures in chat_request.py and chat_service.py for improved flexibility. Remove unused message and response models to streamline codebase.
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| jina_api_key= | |
| brave_search_api_key= | |
| ai_url= | |
| serp_api |