Remove compiled Python cache files from backend and tests

Update .gitignore to include specific __pycache__ directories and adjust patterns for Python files

Fail fast on hard Gemini quota instead of spamming every key

Add Gemini API key rotation

Update try-on tests for the API-based service

feat: implement conversational chatbot with routing and chat history support

feat: integrate local CatVTON virtual try-on and secure env files

Initialize production-grade FastAPI backend with models, routes, celery workers, and test suite