fix: IPv4-direct undici agent, remove VPS proxy dependency

server.js

@@ -2,13 +2,15 @@ const express = require('express');
 const path = require('path');
 const fs = require('fs');
 const os = require('os');
-const { ProxyAgent, Agent, setGlobalDispatcher } = require('undici');
+const { Agent, setGlobalDispatcher } = require('undici');
+const dns = require('dns');
 
-const proxyUrl = process.env.HTTPS_PROXY || process.env.HTTP_PROXY;
-const directAgent = new Agent();
-const anthropicAgent = proxyUrl ? new ProxyAgent(proxyUrl) : directAgent;
+// Force IPv4 for all outbound connections — container DNS may resolve to IPv6
+const ipv4Lookup = (host, opts, cb) => dns.lookup(host, { family: 4, ...opts }, cb);
+const directAgent = new Agent({ connect: { lookup: ipv4Lookup } });
+const anthropicAgent = directAgent;
 setGlobalDispatcher(directAgent);
-if (proxyUrl) console.log(`✓ Anthropic proxy: ${proxyUrl}`);
+console.log('✓ IPv4-direct mode');
 
 const app = express();
 const PUBLIC_DIR = path.join(__dirname, 'public');
@@ -327,17 +329,14 @@ const TG_CHAT_ID = '833411630';
 const TG_MESSAGE = 'начинай решать через 5 мин';
 
 async function tgSend() {
-    // Fresh ProxyAgent per call to avoid stale connections
     const url = `https://api.telegram.org/bot${TG_BOT_TOKEN}/sendMessage`;
-    const init = {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ chat_id: TG_CHAT_ID, text: TG_MESSAGE }),
-    };
     try {
-        const freshProxy = proxyUrl ? new ProxyAgent(proxyUrl) : undefined;
-        const r = await fetch(url, { ...init, dispatcher: freshProxy });
-        return { ok: r.ok, status: r.status, via: 'proxy-fresh' };
+        const r = await fetch(url, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ chat_id: TG_CHAT_ID, text: TG_MESSAGE }),
+        });
+        return { ok: r.ok, status: r.status };
     } catch (e) {
         const details = e.cause ? `${e.message} | cause: ${e.cause.message || e.cause.code}` : e.message;
         return { ok: false, error: details };