Fix PyTorch linear solve input coercion

[FlorianPfaff]

Adds a small PyTorch backend wrapper for linear solve input coercion and a regression test covering list inputs, vector right-hand sides, and mixed floating dtypes.

Testing: added a backend regression test; full suite not run locally.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	72.89s
✅ JSON	prettier	7	0	0	0	1.01s
✅ JSON	v8r	7		0	0	4.11s
✅ MARKDOWN	markdownlint	68	0	0	0	1.95s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.89s
✅ PYTHON	black	1037	38	0	0	65.62s
✅ PYTHON	isort	1037	57	0	0	4.48s
✅ REPOSITORY	checkov	yes		no	no	50.07s
✅ REPOSITORY	gitleaks	yes		no	no	7.77s
✅ REPOSITORY	git_diff	yes		no	no	0.11s
✅ REPOSITORY	secretlint	yes		no	no	34.73s
✅ REPOSITORY	syft	yes		no	no	4.63s
✅ REPOSITORY	trivy-sbom	yes		no	no	12.01s
✅ REPOSITORY	trufflehog	yes		no	no	19.74s
✅ YAML	prettier	11	0	0	0	0.83s
✅ YAML	v8r	11		0	0	12.16s
✅ YAML	yamllint	11		0	0	0.56s

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