Fix PyTorch sort NumPy-style contract

[FlorianPfaff]

Summary

• Add a PyTorch backend sort compatibility shim for NumPy-style axis=None flattening.
• Accept NumPy sort stability controls via kind="stable" / kind="mergesort" and map them to torch.sort(stable=True).
• Wire the shim through backend-support initialization so raw PyTorch backend calls are patched even when the selected public backend is NumPy.
• Add a backend-portable regression covering the raw PyTorch backend and the public PyTorch facade when active.

Bug fixed

The PyTorch backend sort helper exposed a narrower Torch-style signature. Calls that are valid under the PyRecEst/NumPy facade contract, such as sort([[3, 1], [2, 4]], axis=None) or sort([3, 1, 2, 1], kind="stable"), failed instead of matching NumPy-style behavior.

Testing

• Added tests/backend_support/test_pytorch_sort_raw_backend_contract.py.
• Not run locally in this connector-only session; CI should run the focused backend regression.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	78.46s
✅ JSON	prettier	7	0	0	0	1.21s
✅ JSON	v8r	7		0	0	5.67s
✅ MARKDOWN	markdownlint	68	0	0	0	1.91s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	1.05s
✅ PYTHON	black	1133	6	0	0	65.9s
✅ PYTHON	isort	1133	6	0	0	4.45s
✅ REPOSITORY	checkov	yes		no	no	50.14s
✅ REPOSITORY	gitleaks	yes		no	no	11.32s
✅ REPOSITORY	git_diff	yes		no	no	0.15s
✅ REPOSITORY	secretlint	yes		no	no	48.66s
✅ REPOSITORY	syft	yes		no	no	5.16s
✅ REPOSITORY	trivy-sbom	yes		no	no	5.61s
✅ REPOSITORY	trufflehog	yes		no	no	18.14s
✅ YAML	prettier	11	0	0	0	0.84s
✅ YAML	v8r	11		0	0	13.65s
✅ YAML	yamllint	11		0	0	0.51s

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