Add rad2deg to pyrecest.backend (all backends)

[Copilot]

rad2deg was missing from all three backends despite deg2rad being present. Adds it by importing directly from each framework's native library, mirroring the existing deg2rad pattern.

Changes

• numpy backend: from numpy import rad2deg
• pytorch backend: from torch import rad2deg
• jax backend: from jax.numpy import rad2deg
• main _backend/__init__.py: added "rad2deg" to the exported symbols list

Usage

from pyrecest.backend import rad2deg
rad2deg(3.141592653589793)  # → 180.0

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	8.16s
✅ JSON	prettier	2	0	0	0	0.47s
✅ JSON	v8r	2		0	0	2.17s
✅ MARKDOWN	markdownlint	1	0	0	0	0.63s
✅ MARKDOWN	markdown-table-formatter	1	0	0	0	0.27s
✅ PYTHON	bandit	259		0	0	3.22s
✅ PYTHON	black	259	1	0	0	4.85s
✅ PYTHON	flake8	259		0	0	1.84s
✅ PYTHON	isort	259	1	0	0	0.5s
✅ PYTHON	mypy	259		0	0	4.05s
✅ PYTHON	pylint	259		0	0	74.82s
✅ PYTHON	ruff	259	1	0	0	0.04s
✅ REPOSITORY	checkov	yes		no	no	21.95s
✅ REPOSITORY	gitleaks	yes		no	no	4.42s
✅ REPOSITORY	git_diff	yes		no	no	0.02s
✅ REPOSITORY	secretlint	yes		no	no	5.89s
✅ REPOSITORY	syft	yes		no	no	3.61s
✅ REPOSITORY	trivy-sbom	yes		no	no	1.64s
✅ REPOSITORY	trufflehog	yes		no	no	18.18s
✅ YAML	prettier	4	0	0	0	0.47s
✅ YAML	v8r	4		0	0	5.77s
✅ YAML	yamllint	4		0	0	0.46s

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