Verify if we support `vue-router` v5

### Problem Statement

Based on [the docs](https://docs.sentry.io/platforms/javascript/guides/vue/features/vue-router/) we support `vue-router` v2-v4, but v5 is out since January 2026: https://npmx.dev/package/vue-router/v/5.0.0

### Solution Brainstorm

Maybe we just have to add an E2E test and we're done.

### Additional Context

_No response_

### Priority

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Start with the Vue integration documentation, which currently lists vue-router v2–v4, and inspect the existing Vue router E2E coverage. Verify whether vue-router v5 works with the SDK, add the requested E2E coverage if needed, and update the documented supported versions when the test passes.

索引モデルが issue の本文から書いたものです。