fix: move @nuxt/kit into peerDependencies

[huang-julien]

🔗 Linked issue

fix #519

❓ Type of change

This PR moves @nuxt/kit to peerDependencies so users in Nuxt 3 wouldn't have @nuxt/kit 4 getting used due to the dependency graph of nuxt scripts

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
scripts-docs	Ready	Preview	Comment	Sep 29, 2025 4:57pm
scripts-playground	Ready	Preview	Comment	Sep 29, 2025 4:57pm

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/nuxt/scripts/@nuxt/scripts@521

commit: 3a280cc