Start docker compose and fix frontend

[AaLexUser]

Fix frontend container issues by configuring host networking, updating Nginx proxy, correcting the healthcheck, and adding a missing utility file.

The environment lacked full Docker daemon capabilities (e.g., no systemd, iptables), making host networking a necessary workaround. This change required updating the Nginx proxy to localhost. Additionally, the frontend build was failing due to a missing utility file and an incorrect healthcheck format.

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[cursor]

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✨ Finishing touches

🧪 Generate unit tests

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• Commit unit tests in branch cursor/start-docker-compose-and-fix-frontend-a1a7

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