fix(deploy): use consistent network alias for openbrain-brain-internal

Service definitions were using 'openbrain_brain-internal' (underscore) but the
networks block defines the alias as 'openbrain-brain-internal' (hyphen), with
name: openbrain_brain-internal pointing to the actual Docker network.

This caused 'undefined network' errors on every Portainer deploy for
orchestrator and synapse services.

Fixed: all service network references now use 'openbrain-brain-internal'.

docker-compose.swarm.portainer.yml

@@ -333,7 +333,7 @@ services:
       start_period: 40s
     networks:
       - internal
-      - openbrain_brain-internal
+      - openbrain-brain-internal
     cap_drop:
       - ALL
     cap_add:
@@ -406,7 +406,7 @@ services:
     networks:
       - internal
       - traefik-public
-      - openbrain_brain-internal
+      - openbrain-brain-internal
     deploy:
       restart_policy:
         condition: on-failure