fix(nuxt): find parent routes by exact path match

[danielroe]

🔗 Linked issue

resolves #22977

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

It's possible to have paths that produce similarly named paths but are not really the same, for example /[[foo]].vue and /[foo].vue. These should be siblings and not create a parent/child relationship in this case.

As this is a sensitive area, I would particularly value spotting any edge cases I may have overlooked.

📝 Checklist

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

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[pi0]

LGTM

[Atinux]

Looks good to me