Mise à jour capteur bruit: ancien I2C → NSRT MK4 USB

- Nouveau script sound_meter/read.py pour lecture à la demande (JSON)
- launcher.php: appel du script Python au lieu de l'ancien binaire C
- sensors.html: carte USB, suppression boutons start/stop, affichage JSON
- Traductions fr/en: I2C → USB, NSRT MK4

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

sound_meter/read.py

@@ -0,0 +1,34 @@
+'''
+  ____   ___  _   _ _   _ ____
+ / ___| / _ \| | | | \ | |  _ \
+ \___ \| | | | | | |  \| | | | |
+  ___) | |_| | |_| | |\  | |_| |
+ |____/ \___/ \___/|_| \_|____/
+
+python3 /var/www/nebuleair_pro_4g/sound_meter/read.py
+
+Read current values from NSRT MK4 Sound Level Meter (USB /dev/ttyACM0)
+Used by the web interface "Get Data" button via launcher.php
+'''
+
+import json
+import nsrt_mk3_dev
+
+try:
+    nsrt = nsrt_mk3_dev.NsrtMk3Dev('/dev/ttyACM0')
+
+    leq_level = nsrt.read_leq()
+    weighted_level = nsrt.read_level()
+    weighting = nsrt.read_weighting()
+    time_constant = nsrt.read_tau()
+
+    data = {
+        "LEQ": round(leq_level, 2),
+        "dBA": round(weighted_level, 2),
+        "weighting": str(weighting),
+        "tau": time_constant
+    }
+    print(json.dumps(data))
+
+except Exception as e:
+    print(json.dumps({"error": str(e)}))