Modernize codebase with comprehensive improvements

- Replace deprecated pkg_resources with importlib.resources
- Add comprehensive type hints across all modules
- Update Python requirement to 3.8+ with modern TensorFlow compatibility
- Add development dependencies: pytest, black, mypy, flake8, isort, pre-commit
- Implement proper error handling and input validation
- Enhanced logging configuration with proper formatting
- Applied Black code formatting and isort for consistent style
- Added Makefile with standard development commands
- Updated documentation version to 0.3.0
- Improved singleton pattern for model loading
- Created CLAUDE.md for future development guidance

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Co-Authored-By: Claude <[email protected]>