Add chatbot infrastructure documentation

Document Flowise and ngrok configuration on LXC 104, including
troubleshooting steps for CORS and version issues.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

chatbot/infrastructura.md

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+# Infrastructura Chatbot Maria
+
+## Componente
+
+| Componenta | Locație | IP | Port |
+|------------|---------|-----|------|
+| Flowise | LXC 104 | 10.0.20.161 | 3000 |
+| ngrok tunnel | LXC 104 | 10.0.20.161 | - |
+| Pagina chatbot | romfast.ro | - | 443 |
+
+## Configurare Flowise
+
+**Serviciu systemd**: `/etc/systemd/system/flowise.service`
+
+```ini
+[Unit]
+Description=Flowise Service
+After=network.target
+
+[Service]
+User=root
+Group=root
+ExecStart=/usr/bin/npx flowise start
+Restart=always
+Environment=PORT=3000
+Environment=FLOWISE_USERNAME=admin
+Environment=FLOWISE_PASSWORD=parola28
+Environment=CORS_ORIGINS=https://www.romfast.ro,https://romfast.ro
+WorkingDirectory=/root/.flowise
+Environment=FLOWISE_DATABASE_PATH=/root/.flowise/database.sqlite
+
+[Install]
+WantedBy=multi-user.target
+```
+
+**Comenzi utile**:
+```bash
+# Status
+pct exec 104 -- systemctl status flowise
+
+# Restart
+pct exec 104 -- systemctl restart flowise
+
+# Logs
+pct exec 104 -- journalctl -u flowise -f
+```
+
+## Configurare ngrok
+
+**Configurare**: `/root/.config/ngrok/ngrok.yml`
+
+```yaml
+version: "2"
+authtoken: 2mo9quiDc23B6U3TtTqWJEleEfM_jYeD1KYe9u7njaaQMZg2
+tunnels:
+  web:
+    proto: http
+    addr: http://10.0.20.161:3000
+    domain: mutual-special-koala.ngrok-free.app
+```
+
+**Serviciu systemd**: `/etc/systemd/system/ngrok.service`
+
+**URL public**: https://mutual-special-koala.ngrok-free.app
+
+**API endpoint chatbot**:
+```
+POST https://mutual-special-koala.ngrok-free.app/api/v1/prediction/d4911620-07fe-41f8-adb4-f2f52d6ec766
+```
+
+**Comenzi utile**:
+```bash
+# Status
+pct exec 104 -- systemctl status ngrok
+
+# Restart
+pct exec 104 -- systemctl restart ngrok
+
+# Verificare tunel activ
+pct exec 104 -- curl -s http://localhost:4040/api/tunnels
+
+# Verificare versiune
+pct exec 104 -- /usr/local/bin/ngrok --version
+
+# Actualizare ngrok
+pct exec 104 -- /usr/local/bin/ngrok update
+```
+
+## Troubleshooting
+
+### Eroare CORS
+**Simptom**: Browser-ul afișează eroare CORS când se încarcă chatbot-ul.
+
+**Cauza**: Flowise nu are configurată variabila `CORS_ORIGINS`.
+
+**Soluție**: Adaugă în `/etc/systemd/system/flowise.service`:
+```
+Environment=CORS_ORIGINS=https://www.romfast.ro,https://romfast.ro
+```
+Apoi: `systemctl daemon-reload && systemctl restart flowise`
+
+### Eroare ngrok versiune veche (ERR_NGROK_121)
+**Simptom**: În logs apare:
+```
+Your ngrok-agent version "3.16.0" is too old. The minimum supported agent version is "3.19.0"
+```
+
+**Cauza**: ngrok a fost actualizat dar serviciul nu a fost restartat. Procesul vechi continuă să ruleze.
+
+**Soluție**:
+```bash
+# Actualizare (dacă nu e deja făcută)
+pct exec 104 -- /usr/local/bin/ngrok update
+
+# IMPORTANT: Restart după actualizare
+pct exec 104 -- systemctl restart ngrok
+```
+
+### Verificare rapidă că totul funcționează
+```bash
+# Test local Flowise
+pct exec 104 -- curl -s http://localhost:3000/ | head -5
+
+# Test tunel ngrok
+curl -s "https://mutual-special-koala.ngrok-free.app/api/v1/prediction/d4911620-07fe-41f8-adb4-f2f52d6ec766" \
+  -X POST -H "Content-Type: application/json" \
+  -d '{"question":"test"}'
+```
+
+## Pagina web
+
+URL: https://www.romfast.ro/chatbot_maria.html
+
+Pagina încarcă widget-ul Flowise care se conectează la endpoint-ul ngrok.
+
+## Istoric incidente
+
+### 2025-12-30: Chatbot nu funcționa (CORS + ngrok versiune)
+- **Problemă 1**: Flowise nu avea CORS configurat
+- **Problemă 2**: ngrok rula versiunea 3.16.0 (actualizată dar nerestartat din octombrie)
+- **Soluție**: Adăugat CORS_ORIGINS și restart la ambele servicii