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

scripts/common.sh

@@ -232,46 +232,6 @@ detect_server_role() {
     fi
 }
 
-# Generate Traefik provider configuration for a remote Docker host
-generate_traefik_provider_config() {
-    local server_ip="$1"
-    local server_hostname="$2"
-    local output_file="$3"
-    
-    debug_log "Generating Traefik provider config for $server_hostname ($server_ip)"
-    
-    if [ -z "$server_ip" ] || [ -z "$server_hostname" ] || [ -z "$output_file" ]; then
-        log_error "generate_traefik_provider_config requires server_ip, server_hostname, and output_file"
-        return 1
-    fi
-    
-    # Get domain from environment or use a default
-    local domain="${DOMAIN:-${DUCKDNS_DOMAIN}}"
-    
-    cat > "$output_file" <<EOF
-# Traefik Docker Provider for Remote Server: $server_hostname
-# Auto-generated by EZ-Homelab
-# Last updated: $(date '+%Y-%m-%d %H:%M:%S')
-
-providers:
-  docker:
-    endpoint: "tcp://${server_ip}:2376"
-    exposedByDefault: false
-    network: traefik-network
-    watch: true
-    tls:
-      ca: /shared-ca/ca.pem
-      cert: /shared-ca/cert.pem
-      key: /shared-ca/key.pem
-      insecureSkipVerify: false
-    # Server-specific constraints
-    defaultRule: "Host(\`{{ normalize .Name }}.${domain}\`)"
-EOF
-    
-    log_success "Generated Traefik provider config: $output_file"
-    debug_log "Provider config written to $output_file"
-}
-
 # Generate Sablier middleware configuration for remote server
 generate_sablier_middleware_config() {
     local server_hostname="$1"