Preserve FFT dim with None axis aliases

[FlorianPfaff]

Summary

• keep explicit PyTorch dim when axis=None or axes=None is forwarded
• add regression coverage for this edge case in the raw PyTorch FFT helper tests

Testing

• Added/updated backend support regression assertions.

[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	1.0s
✅ JSON	v8r	7		0	0	4.79s
✅ MARKDOWN	markdownlint	68	0	0	0	1.89s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.94s
✅ PYTHON	black	1121	10	0	0	61.71s
✅ PYTHON	isort	1121	15	0	0	4.73s
✅ REPOSITORY	checkov	yes		no	no	47.7s
✅ REPOSITORY	gitleaks	yes		no	no	10.95s
✅ REPOSITORY	git_diff	yes		no	no	0.21s
✅ REPOSITORY	secretlint	yes		no	no	36.16s
✅ REPOSITORY	syft	yes		no	no	5.16s
✅ REPOSITORY	trivy-sbom	yes		no	no	11.33s
✅ REPOSITORY	trufflehog	yes		no	no	20.09s
✅ YAML	prettier	11	0	0	0	0.84s
✅ YAML	v8r	11		0	0	12.16s
✅ YAML	yamllint	11		0	0	0.6s

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