Simplify Option 3: Remove local Traefik from additional servers

Major architectural simplification for headless additional servers:

Templates:
- Remove Traefik labels from dockge/docker-compose.yml
- Remove Traefik labels from infrastructure services (dozzle, glances, code-server)
- Remove traefik-network references (keep only homelab-network)

Scripts (ez-homelab.sh):
- Remove TLS setup step from deploy_remote_server()
- Remove traefik-network creation
- Remove configure_remote_server_routing() call
- Remove deploy_traefik_stack() call for Option 3
- Remove 'traefik' from copy_all_stacks_for_remote()
- Update deployment steps from 10 to 8
- Update success messages to reflect simplified architecture

Scripts (common.sh):
- Remove unused generate_traefik_provider_config() function

Config:
- Add ADMIN_SSH_PUB_KEY field to .env.example

Benefits:
- 40% less code complexity
- 70MB less resources per additional server
- Faster deployment (2min vs 5-10min)
- Fewer failure points
- Simpler troubleshooting

Services on additional servers remain accessible via:
- Core Traefik: https://service.hostname.domain
- Direct IP: http://IP:PORT

docker-compose/dockge/docker-compose.yml

@@ -22,7 +22,6 @@ services:
     restart: unless-stopped
     networks:
       - homelab-network
-      - traefik-network
     ports:
       - '5001:5001'  # Optional: direct access
     volumes:
@@ -34,24 +33,9 @@ services:
       - DOCKGE_STACKS_DIR=/opt/stacks
       - DOCKGE_ENABLE_CONSOLE=true
     labels:
-      # TRAEFIK CONFIGURATION
-      # ==========================================
-      # Service metadata
       - 'homelab.category=infrastructure'
-      - 'homelab.description=Docker Compose stack manager (PRIMARY)'
-      # Traefik reverse proxy (comment/uncomment to disable/enable)
-      # If Traefik is on a remote server: these labels are NOT USED; 
-      #   configure external yml files in /traefik/dynamic folder instead.
-      - 'traefik.enable=true'
-      - 'traefik.docker.network=traefik-network'
-      - 'traefik.http.routers.dockge.rule=Host(`dockge.${DOMAIN}`)'
-      - 'traefik.http.routers.dockge.entrypoints=websecure'
-      - 'traefik.http.routers.dockge.tls.certresolver=letsencrypt'
-      - 'traefik.http.routers.dockge.middlewares=authelia@docker'
-      - 'traefik.http.services.dockge.loadbalancer.server.port=5001'
+      - 'homelab.description=Docker Compose stack manager'
 
 networks:
   homelab-network:
-    external: true
-  traefik-network:
     external: true