refactor!: remove next.js (#3267)

apps/core/server.mts

@@ -0,0 +1,15 @@
+// static server for web app
+import express from 'express';
+const app = express();
+
+const PORT = process.env.PORT || 8080;
+
+app.use('/', express.static('dist'));
+
+app.get('/*', (req, res) => {
+  res.sendFile('index.html', { root: 'dist' });
+});
+
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});