RabbitMQ stores its data under rabbit@<hostname>, and the hostname
changed with every recreated container, so an image update or an .env
change came up with an empty broker. Pin it to `rabbitmq` and document
how to carry the definitions over on an existing deployment.
Every project shares infra-net, where a generic service name like `api`
resolves to every container that has it, round-robin, across projects.
The edge now proxies to container names (musify-api, infra-zitadel, ...).
Admin
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