feat(nftables):add nftables support for nftables

ts/proxies/smart-proxy/index.ts

@@ -19,6 +19,7 @@ export { NetworkProxyBridge } from './network-proxy-bridge.js';
 // Export route-based components
 export { RouteManager } from './route-manager.js';
 export { RouteConnectionHandler } from './route-connection-handler.js';
+export { NFTablesManager } from './nftables-manager.js';
 
 // Export all helper functions from the utils directory
 export * from './utils/index.js';