fix: make data validation commands reliable

[vincenzofamoso]

npm run lint currently starts jsonlint without a file, which makes it read
empty stdin and fail. This points it at data.json and keeps successful output
quiet.

The duplicate check also ignored groupTitle, so the same tool appearing in
two different subcategories was reported as a duplicate. Including the group
leaves only the actual duplicate Envio entry, which is already handled by #92.

Testing

• npm run lint
• npm run validate

[hashdit-bot]

Pull Request Review

This PR makes the Node.js data-validation workflow more reliable by linting data.json directly and suppressing successful jsonlint output. It also scopes duplicate detection by category, group title, and tool name, reducing false-positive warnings across different subcategories.

Sensitive Content

No sensitive content detected.

Security Issues

No serious security issues detected.

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