fix: proxy only Anthropic via VPS; sechenov direct (VPS was banned)

server.js

@@ -2,13 +2,11 @@ const express = require('express');
 const path = require('path');
 const fs = require('fs');
 const os = require('os');
-const { ProxyAgent, setGlobalDispatcher } = require('undici');
+const { ProxyAgent } = require('undici');
 
 const proxyUrl = process.env.HTTPS_PROXY || process.env.HTTP_PROXY;
-if (proxyUrl) {
-    setGlobalDispatcher(new ProxyAgent(proxyUrl));
-    console.log(`✓ Using proxy: ${proxyUrl}`);
-}
+const anthropicAgent = proxyUrl ? new ProxyAgent(proxyUrl) : undefined;
+if (proxyUrl) console.log(`✓ Anthropic proxy: ${proxyUrl}  (sechenov: direct)`);
 
 const app = express();
 const PUBLIC_DIR = path.join(__dirname, 'public');
@@ -57,6 +55,7 @@ const SYSTEM_PROMPT = [
 async function callClaude(modelId, text, accessToken) {
     return fetch('https://api.anthropic.com/v1/messages', {
         method: 'POST',
+        dispatcher: anthropicAgent,
         headers: {
             'Content-Type': 'application/json',
             'Authorization': `Bearer ${accessToken}`,