🐛(dev) missing default network for podman compose usage

Some services, like celery-dev, attach to the `default` network
explicitly, next to `lasuite`. Docker compose creates that implicit
network on its own. Podman compose does not when the top-level
`networks` section is declared without it, so `compose up` failed on
the unknown `default` network.

Declare `default: {}` so that the network exists with both tools.

compose.yml

@@ -336,6 +336,7 @@ services:
       - "4000:3000"
 
 networks:
+  default: {}
   lasuite:
     name: lasuite-network
     driver: bridge