build(deps-dev): bump @vitejs/plugin-react from 4.7.0 to 6.1.1 in /frontend - #6

Some specified paths were not resolved, unable to cache dependencies.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v5, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/