Simplify API7 Enterprise admin URL to use short service name

Changed adminUrl from fully qualified domain name to short service name:
- Before: http://api7ee3-0-1759339083-dashboard.api7ee.svc.cluster.local:7080
- After: http://api7ee3-0-1759339083-dashboard:7080

The short name works within the same namespace and is simpler to manage.
This fixes the ADC sync job which was failing with 404 errors.

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

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

helm/api7ee-demo-k8s/values.yaml

@@ -218,7 +218,7 @@ api7:
   # API7 Gateway connection
   gateway:
     # Use the Dashboard service for API7 Enterprise admin API
-    adminUrl: http://api7ee3-0-1759339083-dashboard.api7ee.svc.cluster.local:7080
+    adminUrl: http://api7ee3-0-1759339083-dashboard:7080
     adminKey: "" # Change this!
     group: default
     # Gateway service for traffic routing