fix: opt in to import.meta.* properties

[danielroe]

This is a very early PR to make this module compatible with changes we expect to release in Nuxt v5.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 57.47%. Comparing base (9e24605) to head (9a626a4).

Files	Patch %	Lines
src/runtime/router.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #526 +/- ##
=======================================
Coverage 57.47% 57.47% =======================================
Files 11 11 Lines 729 729 Branches 35 35 =======================================
Hits 419 419 Misses 310 310 

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