fix: give cell-network an explicit name to avoid compose project prefix

Without name: cell-network, Docker Compose creates the network as
pic_cell-network (prefixed with the project name). Store service compose
templates declare cell-network as external: true and can't find it.
Adding name: cell-network makes the network name predictable regardless
of the Compose project name.

Existing installs need: make stop && make start to recreate the network.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -180,6 +180,7 @@ services:
 
 networks:
   cell-network:
+    name: cell-network
     driver: bridge
     ipam:
       config: