Fix variable substitution patterns: remove :-default fallbacks

- Replace all ${VARIABLE:-default} with ${VARIABLE} in compose files
- Ensure explicit variable requirements without default values
- Updated 10 docker-compose.yml files across all stacks
- Made reset-ondemand-services.sh executable

docker-compose/monitoring/docker-compose.yml

@@ -92,11 +92,11 @@ services:
       - grafana-data:/var/lib/grafana
       - ./config/grafana/provisioning:/etc/grafana/provisioning
     environment:
-      - GF_SECURITY_ADMIN_PASSWORD=${GRAFANA_ADMIN_PASSWORD:-admin}
+      - GF_SECURITY_ADMIN_PASSWORD=${GRAFANA_ADMIN_PASSWORD}
       - GF_USERS_ALLOW_SIGN_UP=false
       - GF_SERVER_ROOT_URL=https://grafana.${DOMAIN}
       - GF_INSTALL_PLUGINS=grafana-clock-panel,grafana-simple-json-datasource,grafana-piechart-panel
-    user: "${PUID:-1000}:${PGID:-1000}"
+    user: "${PUID}:${PGID}"
     depends_on:
       - prometheus
     labels: