fix: rollup comment annotation warning

[BobbieGoede]

🔗 Linked issue

• 2640

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Resolves #2640

Not sure if it this is the correct way to solve this issue, I don't exactly understand how the comment works and should be handled. I looked at https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/pages/runtime/composables.ts#L55-L83 for reference, our defineI18nRoute macro works in a similar way to definePageMeta in Nuxt but that doesn't use a comment like this, while defineRouteRules does which is also similar to our macro.

Let me know if this should be solved differently, this change simply removes the comment and adds a usage check just like definePageMeta has.

📝 Checklist

• [x] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[danielroe]

I think if you update to /*@__PURE__*/ it will prevent the warning.