Backend

This section describes the backend modules in Optiland. The backend provides different computational engines for ray tracing and other calculations.

`backend.base`	AbstractBackend ABC, @passthrough decorator, and BackendCapabilityError.
`backend.numpy_backend`	NumPy backend — implements AbstractBackend using NumPy and SciPy.
`backend.torch_backend`	PyTorch backend — implements AbstractBackend using PyTorch.
`backend.utils`	Utility functions for working with different backends.