v1.5.2: page capteurs NPM via get_data_modbus_v3.py --dry-run

- NPM: mode --dry-run (print JSON sans ecriture en base)
- launcher.php: endpoint npm appelle get_data_modbus_v3.py --dry-run
- sensors.html: affichage PM + temp + humidite + status NPM decode
- Suppression unite ug/m3 sur le champ status

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-1.5.1
+1.5.2