Fix multiserver deployment: domain in docker-provider and auto-disable remote Traefik

- Fix missing domain in docker provider defaultRule (use DOMAIN or DUCKDNS_DOMAIN)
- Add disable_traefik_on_remote_services() to strip routing labels from remote services
- Call disable function automatically during remote server deployment (Step 5.5)
- Remote services now properly accessed through core Traefik via docker provider
- Prevents errors: middleware/certresolver not found on remote Traefik

Resolves Traefik errors on remote servers where services had labels for
SSL/auth that only exist on core server.

scripts/common.sh

@@ -245,6 +245,9 @@ generate_traefik_provider_config() {
         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: $server_hostname
 # Auto-generated by EZ-Homelab
@@ -262,7 +265,7 @@ providers:
       key: /shared-ca/key.pem
       insecureSkipVerify: false
     # Server-specific constraints
-    defaultRule: "Host(\`{{ normalize .Name }}.${DUCKDNS_DOMAIN}\`)"
+    defaultRule: "Host(\`{{ normalize .Name }}.${domain}\`)"
 EOF
     
     log_success "Generated Traefik provider config: $output_file"