chore(demo): migrate default server.ts to angular@19

Author: pieh

demo/server.ts

@@ -1,5 +1,5 @@
 import { APP_BASE_HREF } from '@angular/common';
-import { CommonEngine } from '@angular/ssr';
+import { CommonEngine } from '@angular/ssr/node';
 import express from 'express';
 import { fileURLToPath } from 'node:url';
 import { dirname, join, resolve } from 'node:path';