fix: add momo-pro_default external network to scheduler for momo-db access

Scheduler container needs to reach momo-db (on momo-pro_default network).
Without this, psycopg2 fails with DNS name resolution error on every recreate.

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

docker-compose.yml

@@ -241,6 +241,7 @@ services:
       - postgres
     networks:
       - momo-network
+      - momo-pro_default
     logging:
       driver: "json-file"
       options:
@@ -724,6 +725,8 @@ networks:
   momo-network:
     driver: bridge
     name: momo-network
+  momo-pro_default:
+    external: true
 
 # =============================================================================
 # Volumes