feat: Add locale keys validation script

[O2sa]

Create a small script that validates all locale JSON files contain the same set of keys as locales/en.json. This helps keep translations in sync and is a useful CI check.

Tasks

• Add a script scripts/validate-locales.js that loads locales/en.json and validates other locales/*.json files contain the same keys (report missing/extra keys).
• Add an npm script validate-locales to package.json to run the script.
• Optionally add the script to CI to fail on mismatched keys.

Tip

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[rue-eru]

assign me 😌
Hi! I'd like to work on this issue. I have experience with Next.js and i18n. I have worked with similar projects and the task looks pretty interesting to me! I would love to try.

[github-actions]

🎉 Issue assigned to @rue-eru! Happy coding!