PolAI Voicebot - serwer dziala.
Endpointy:
  GET  /health           -> healthcheck
  POST /incoming-call    -> Twilio webhook (TwiML)
  POST /call-status      -> Twilio status callback (opcjonalne)
  WS   /twilio-stream    -> Twilio Media Streams
  GET  /calls            -> lista ostatnich rozmow (JSON)
  GET  /calls/:callSid   -> szczegoly rozmowy (transcript, appointments, messages)
  GET  /dashboard        -> minimal HTML dashboard