Fix backend and wrapped distribution edge cases

[FlorianPfaff]

Summary

• fix JAX/PyTorch backend conversion and assignment edge cases
• allow array bounds in backend random uniform helpers
• accept scalar wrapped Laplace parameters and cover scalar likelihood callbacks

Validation

• Ran git diff --check only.
• Tests not run per request.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	28.97s
✅ PYTHON	black	10	2	0	0	2.82s
✅ PYTHON	isort	10	2	0	0	0.57s
✅ REPOSITORY	checkov	yes		no	no	29.06s
✅ REPOSITORY	gitleaks	yes		no	no	13.19s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	10.99s
✅ REPOSITORY	syft	yes		no	no	4.05s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.03s
✅ REPOSITORY	trufflehog	yes		no	no	19.26s

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