Fix Option 3: Create traefik-network and improve sed patterns

Issue: Option 3 deployment failed because traefik-network wasn't created,
but the cleanup function didn't properly strip network references from files.

Changes:
- scripts/ez-homelab.sh: Add traefik-network creation in Step 2
  (Network is harmless if unused - prevents docker compose errors)
- Improve sed patterns in configure_remote_server_routing():
  * Use anchored patterns (^ and $) to match exact lines
  * Fix network removal regex to match indentation correctly

The traefik-network will exist but remain unused on additional servers.
Services are accessed via core Traefik's manual HTTP routes.

docker-compose/dockge/docker-compose.yml

@@ -38,7 +38,7 @@ services:
       - 'homelab.description=Docker Compose stack manager'
       - 'traefik.enable=true'
       - 'traefik.docker.network=traefik-network'
-      - 'traefik.http.routers.dockge.rule=Host(`dockge.${DOMAIN}`)'
+      - 'traefik.http.routers.dockge.rule=Host(`dockge.${SERVER_HOSTNAME}.${DOMAIN}`)'
       - 'traefik.http.routers.dockge.entrypoints=websecure'
       - 'traefik.http.routers.dockge.tls.certresolver=letsencrypt'
       - 'traefik.http.routers.dockge.middlewares=authelia@docker'