fix(output): allow literal-dotted keys in --output-fields paths

[flobernd]

Summary

• Cat APIs return flat objects whose keys contain literal dots (docs.count, store.size), but --output-fields parsing split every dot as a nesting separator, silently dropping those fields.
• getNestedValue now prefers a literal-key match before falling back to dot-notation descent; pickFields preserves the literal key verbatim in the projected output.
• Existing nested-path behaviour for normal JSON responses is unchanged; a literal key wins over an equivalent nested path when both are present.

Closes #325

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	7.13s
✅ REPOSITORY	gitleaks	yes		no	no	54.84s
✅ REPOSITORY	git_diff	yes		no	no	0.62s
✅ REPOSITORY	secretlint	yes		no	no	27.08s
✅ REPOSITORY	trivy	yes		no	no	19.58s
✅ TYPESCRIPT	eslint	2		0	0	5.9s

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[JoshMock]

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