Fix: docs(frontend): add frontend/README.md for local dev onboarding - #1674

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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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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Resource not accessible by integration - https://docs.github.com/rest

This run of the CodeQL Action does not have permission to access the CodeQL Action API endpoints. This could be because the Action is running on a pull request from a fork. If not, please ensure the workflow has at least the 'security-events: read' permission. Details: Resource not accessible by integration - https://docs.github.com/rest