refactor: restructure codebase to enterprise level organization

✅ Moved all demo files to demo/ folder with comprehensive README ✅ Organized test files into proper test/ subdirectories:

• tests/integration/ for integration tests
• tests/demo/ for demo-specific tests
• tests/unit/ ready for unit tests ✅ Created tests/init.py with proper documentation ✅ Cleaned up base directory - only essential project files remain ✅ Removed cache files and test output directories

Enterprise-level directory structure: 📁 demo/ - All demo scripts with README 📁 tests/ - Organized test suites 📁 src/ - Main source code 📁 deployment/ - Infrastructure configs 📁 docker/ - Container configs 📁 docs/ - Documentation 📄 Root files - Only project essentials (.env, requirements, etc.)

Base directory is now clean and professional ⭐