fix: use container hostname and correct network name

- Replace hardcoded IP 172.29.0.7 with container hostname 'outline'
- Fix network name from 'domverse' to 'domnet' (actual external network)

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

docker-compose.yml

@@ -18,11 +18,11 @@ services:
     restart: unless-stopped
     networks:
       - default
-      - domverse
+      - domnet
     labels:
-      - "traefik.docker.network=domverse"
+      - "traefik.docker.network=domnet"
       - "traefik.enable=true"
-      - "traefik.http.routers.outline-sync.rule=Host(`sync.domverse-berlin.eu`)"
+      - "traefik.http.routers.outline-sync.rule=Host(`sync.domnet-berlin.eu`)"
       - "traefik.http.routers.outline-sync.entrypoints=https"
       - "traefik.http.routers.outline-sync.tls.certresolver=http"
       - "traefik.http.routers.outline-sync.middlewares=authentik@docker"
@@ -36,7 +36,7 @@ services:
       - outline-sync-ts
     network_mode: "service:outline-sync-ts"
     environment:
-      - OUTLINE_URL=${OUTLINE_URL:-http://172.29.0.7:3000}
+      - OUTLINE_URL=${OUTLINE_URL:-http://outline:3000}
       - OUTLINE_TOKEN=${OUTLINE_TOKEN}
 
 volumes:
@@ -45,5 +45,5 @@ volumes:
 
 networks:
   default: {}
-  domverse:
+  domnet:
     external: true