Fix PM2 cluster mode ECONNREFUSED errors

Node.js 17+ changed DNS resolution to prefer IPv6 over IPv4. When running
in PM2 cluster mode, this causes "ECONNREFUSED ::1:8080" errors if the
backend only listens on IPv4 (127.0.0.1).

This fix sets dns.setDefaultResultOrder('ipv4first') at the very start
of the SSR bootstrap to ensure localhost resolves to IPv4.

See: nodejs/node#40537

🤖 Generated with [Claude Code](https://claude.ai/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bram-atmire

src/main.server.ts

@@ -1,3 +1,12 @@
+/**
+ * Fix for Node.js 17+ where DNS resolution prefers IPv6 over IPv4.
+ * This causes "ECONNREFUSED ::1:8080" errors in PM2 cluster mode when
+ * the backend only listens on IPv4.
+ * See: https://github.com/nodejs/node/issues/40537
+ */
+import * as dns from 'node:dns';
+dns.setDefaultResultOrder('ipv4first');
+
 import 'core-js/es/reflect';
 import 'zone.js';
 import 'reflect-metadata';