feat: intégration capteur CO2 MH-Z19

- Scripts MH-Z19/get_data.py (lecture standalone) et write_data.py (écriture SQLite)
- Table data_MHZ19, config MHZ19, cleanup et service systemd (120s)
- Web UI : carte test sensors, checkbox admin, boutons database + CSV download
- SARA_send_data_v2.py non modifié (sera fait dans un second temps)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

services/setup_services.sh

@@ -205,6 +205,38 @@ AccuracySec=1s
 WantedBy=timers.target
 EOL
 
+# Create service and timer files for MH-Z19 CO2 Data
+cat > /etc/systemd/system/nebuleair-mhz19-data.service << 'EOL'
+[Unit]
+Description=NebuleAir MH-Z19 CO2 Data Collection Service
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/python3 /var/www/nebuleair_pro_4g/MH-Z19/write_data.py
+User=root
+WorkingDirectory=/var/www/nebuleair_pro_4g
+StandardOutput=append:/var/www/nebuleair_pro_4g/logs/mhz19_service.log
+StandardError=append:/var/www/nebuleair_pro_4g/logs/mhz19_service_errors.log
+
+[Install]
+WantedBy=multi-user.target
+EOL
+
+cat > /etc/systemd/system/nebuleair-mhz19-data.timer << 'EOL'
+[Unit]
+Description=Run NebuleAir MH-Z19 CO2 Data Collection every 120 seconds
+Requires=nebuleair-mhz19-data.service
+
+[Timer]
+OnBootSec=120s
+OnUnitActiveSec=120s
+AccuracySec=1s
+
+[Install]
+WantedBy=timers.target
+EOL
+
 # Create service and timer files for Database Cleanup
 cat > /etc/systemd/system/nebuleair-db-cleanup-data.service << 'EOL'
 [Unit]
@@ -294,7 +326,7 @@ systemctl daemon-reload
 
 # Enable and start all timers
 echo "Enabling and starting all services..."
-for service in npm envea sara bme280 mppt db-cleanup noise; do
+for service in npm envea sara bme280 mppt mhz19 db-cleanup noise; do
     systemctl enable nebuleair-$service-data.timer
     systemctl start nebuleair-$service-data.timer
     echo "Started nebuleair-$service-data timer"