A healthcare company is migrating their patient management application to Azure. The application consists of a web frontend and an API backend that processes patient data. The development team wants to deploy both components as containers that can communicate with each other and scale independently. The web frontend requires port 80 exposure to the internet, while the API backend should only be accessible from within the container environment. The solution must minimize infrastructure management overhead and support automatic scaling based on HTTP traffic. Which Azure service should you recommend?