- Convert System and Molecule classes to use @dataclass and field for defaults
- Remove unused imports and legacy code from system.py
- Move print_charges_and_dipole method from System to Player for better separation of concerns
- Minor formatting and import order improvements for consistency
- Replace manual property updates with @cached_property for total_mass, com, and inertia_tensor
- Introduce invalidate_computed_properties decorator to auto-invalidate cached properties on atom changes
- Vectorize distances_between_atoms, sizes_of_molecule, and minimum_distance calculations using numpy
- Unify and clarify center of mass and standard orientation methods (move_center_of_mass_to_origin, rotate_to_standard_orientation)
- Remove redundant or outdated code, improve typing and error handling
- Update dependent files and tests to use new method names and behaviors
