fix: form-data пакет вместо Blob, правильный multipart

server.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const multer = require('multer');
 const path = require('path');
+const FormData = require('form-data');
 const app = express();
 const PORT = process.env.PORT || 3000;
 const API_KEY = process.env.API_KEY || '';
@@ -28,10 +29,10 @@ app.post('/api/whisper', upload.single('audio'), async (req, res) => {
   try {
     if (!req.file) return res.status(400).json({ error: 'No audio file' });
     const form = new FormData();
-    form.append('file', new Blob([req.file.buffer], { type: req.file.mimetype }), 'audio.webm');
+    form.append('file', req.file.buffer, { filename: 'audio.webm', contentType: req.file.mimetype || 'audio/webm' });
     form.append('model', 'whisper-large-v3-turbo');
     const r = await fetch(`${API_BASE}/v1/audio/transcriptions`, {
-      method: 'POST', headers: { Authorization: `Bearer ${API_KEY}` }, body: form,
+      method: 'POST', headers: { Authorization: `Bearer ${API_KEY}`, ...form.getHeaders() }, body: form,
     });
     const data = await r.json();
     res.json({ text: data.text || '' });