feat: structures globales config.h + main.cpp initial

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

src/main.cpp

@@ -0,0 +1,21 @@
+#include <Arduino.h>
+#include "config.h"
+
+// ── Définitions des variables globales ─────────────────────────────
+SondeConfig sondesConfig[NB_SONDES] = {
+    { "T°C Ext",   "maison/jardin/ext/temperature",   60000, 0.2f },
+    { "T°C Serre", "maison/jardin/serre/temperature", 60000, 0.1f },
+    { "T°C Sol",   "maison/jardin/sol/temperature",   60000, 0.1f },
+};
+SondeEtat       sondesEtat[NB_SONDES]  = {};
+PointHistorique historique[HIST_TAILLE] = {};
+uint16_t        histIdx                = 0;
+NetworkStatus   netStatus              = {};
+
+void setup() {
+    Serial.begin(115200);
+    Serial.println("[BOOT] esp_jardin démarrage...");
+}
+
+void loop() {
+}