Fix: Add silverpay network to LittleShop deployment

Added silverpay_silverpay-network to docker-compose.production.yml to ensure
littleshop-admin container can communicate with TeleBot and SilverPay services.

This prevents the "Name or service not known" error that occurs when CI/CD
redeploys the container without reconnecting it to the shared network.

Changes:
- Added silverpay_silverpay-network to service networks
- Declared external network in networks section

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docker-compose.production.yml

@@ -40,6 +40,7 @@ services:
 
     networks:
       - littleshop-network
+      - silverpay_silverpay-network
 
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:5000/api/catalog/products"]
@@ -68,3 +69,5 @@ networks:
     ipam:
       config:
         - subnet: 172.21.0.0/16
+  silverpay_silverpay-network:
+    external: true