feat: module capteurs DS18B20 — acquisition non-bloquante, buffer circulaire 24h

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

src/main.cpp

@@ -1,6 +1,7 @@
 #include <Arduino.h>
 #include "config.h"
 #include "network.h"
+#include "sensors.h"
 
 SondeConfig sondesConfig[NB_SONDES] = {
     { "T°C Ext",   "maison/jardin/ext/temperature",   60000, 0.2f },
@@ -16,8 +17,10 @@ void setup() {
     Serial.begin(115200);
     Serial.println("[BOOT] esp_jardin démarrage...");
     network_init();
+    sensors_init();
 }
 
 void loop() {
     network_update();
+    sensors_update();
 }