Handle backend array-like scalar products

[FlorianPfaff]

Summary

• handle scalar and array-like products consistently across backends
• cover common, shared NumPy/autograd, JAX, and PyTorch implementations
• add backend contract coverage for array-like scalar product behavior

Validation

• Not run per request
• Syntax checked with python -m py_compile src/pyrecest/_backend/_common.py src/pyrecest/_backend/_shared_numpy/__init__.py src/pyrecest/_backend/autograd/__init__.py src/pyrecest/_backend/jax/__init__.py src/pyrecest/_backend/pytorch/__init__.py tests/test_autograd_backend_import.py tests/test_backend_contracts.py
• Checked diff with git diff --check

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	65.46s
✅ JSON	prettier	7	0	0	0	1.28s
✅ JSON	v8r	7		0	0	5.21s
✅ MARKDOWN	markdownlint	68	0	0	0	1.92s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.59s
✅ PYTHON	black	823	0	0	0	50.05s
✅ PYTHON	isort	823	0	0	0	3.0s
✅ REPOSITORY	checkov	yes		no	no	47.12s
✅ REPOSITORY	gitleaks	yes		no	no	13.86s
✅ REPOSITORY	git_diff	yes		no	no	0.06s
✅ REPOSITORY	secretlint	yes		no	no	23.57s
✅ REPOSITORY	syft	yes		no	no	1.99s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.82s
✅ REPOSITORY	trufflehog	yes		no	no	26.54s
✅ YAML	prettier	11	0	0	0	0.76s
✅ YAML	v8r	11		0	0	11.42s
✅ YAML	yamllint	11		0	0	0.51s

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