fix: use undici ProxyAgent for fetch through VPS

server.js

@@ -2,6 +2,13 @@ const express = require('express');
 const path = require('path');
 const fs = require('fs');
 const os = require('os');
+const { ProxyAgent, setGlobalDispatcher } = require('undici');
+
+const proxyUrl = process.env.HTTPS_PROXY || process.env.HTTP_PROXY;
+if (proxyUrl) {
+    setGlobalDispatcher(new ProxyAgent(proxyUrl));
+    console.log(`✓ Using proxy: ${proxyUrl}`);
+}
 
 const app = express();
 app.use(express.json({ limit: '10mb' }));