Add Twilio and Cloudflare tunnel setup docs

docs/twilio-setup.md

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+# Twilio + Cloudflare Tunnel Setup
+
+## 1. Twilio Account
+- Sign up at twilio.com
+- Buy a phone number (~$1.15/mo)
+- Note your Account SID and Auth Token from the dashboard
+
+## 2. Environment Variables
+Add to `.env`:
+```
+TWILIO_ACCOUNT_SID=ACxxxxxxxx
+TWILIO_AUTH_TOKEN=xxxxxxxx
+TWILIO_PHONE_NUMBER=+1xxxxxxxxxx
+TWILIO_WEBHOOK_BASE_URL=https://radio.yourdomain.com
+```
+
+## 3. Cloudflare Tunnel
+Create a tunnel that routes to your local server:
+
+```bash
+cloudflared tunnel create radio-show
+cloudflared tunnel route dns radio-show radio.yourdomain.com
+```
+
+Run during shows:
+```bash
+cloudflared tunnel --url http://localhost:8000 run radio-show
+```
+
+Or add to your NAS Cloudflare tunnel config.
+
+## 4. Twilio Webhook Config
+In the Twilio console, configure your phone number:
+- Voice webhook URL: `https://radio.yourdomain.com/api/twilio/voice`
+- Method: POST
+
+## 5. Test
+1. Start the server: `./run.sh`
+2. Start the tunnel: `cloudflared tunnel run radio-show`
+3. Call your Twilio number from a phone
+4. You should see the caller appear in the queue panel