feat: serveur web HTTP + WebSocket, API REST complète (status/temperatures/history/config)

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

src/main.cpp

@@ -2,6 +2,7 @@
 #include "config.h"
 #include "network.h"
 #include "sensors.h"
+#include "web_server.h"
 
 SondeConfig sondesConfig[NB_SONDES] = {
     { "T°C Ext",   "maison/jardin/ext/temperature",   60000, 0.2f },
@@ -18,9 +19,13 @@ void setup() {
     Serial.println("[BOOT] esp_jardin démarrage...");
     network_init();
     sensors_init();
+    web_server_init();
 }
 
 void loop() {
     network_update();
-    sensors_update();
+    bool nouvelleMesure = sensors_update();
+    if (nouvelleMesure) {
+        web_server_notify_clients();
+    }
 }