Refactor imports in main_v2.py to include SmartSearchTool, enhance code organization in model_factory.py by removing unnecessary whitespace, and improve formatting in test_questions.py for better readability and consistency.

Enhance project structure by adding new files and updating dependencies. Introduce model_factory.py for streamlined model creation using environment variables. Update .gitignore to exclude additional cache and model files. Modify main_v2.py to utilize ModelFactory for model instantiation and adjust API key loading. Expand requirements.txt with new dependencies for improved functionality. Add new notebooks for fine-tuning and model training, enhancing project documentation and usability.