Add tests directory with API tests

Update README: Refined project documentation

Professional QA Audit: Cleaned codebase, optimized analysis, and removed dead code

feat: Add Ollama local LLM integration with GROQ fallback - Zero-cost reports with automatic cloud backup - Updated config.py with USE_OLLAMA, OLLAMA_URL, OLLAMA_MODEL - Added _generate_with_ollama() with auto-fallback to GROQ - Created .env.template for easy setup - Production-ready with robust error handling

first commit

Initial commit - GitHub User Data Analyzer backend