v1.6.0: envoi npm_status dans payload UDP (byte 67)

- Lecture npm_status depuis derniere mesure en base (rowid DESC, pas de moyenne)
- Independant du RTC (pas de dependance au timestamp)
- Byte 67 du payload UDP = registre status NextPM

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

loop/SARA_send_data_v2.py

@@ -846,6 +846,11 @@ try:
     payload_csv[18] = npm_temp
     payload_csv[19] = npm_hum
 
+    # npm_status: last value only (no average), use rowid (not timestamp)
+    npm_status_value = rows[0][7] if rows and rows[0][7] is not None else 0
+    payload.set_npm_status(npm_status_value)
+    print(f"NPM status: 0x{npm_status_value:02X}")
+
     #add data to payload UDP
     payload.set_npm_core(PM1, PM25, PM10)
     payload.set_npm_internal(npm_temp, npm_hum)