fix: réseau — modeAP reset dans _demarrerSTA, MDNS.end() avant begin, rssi=0 en AP

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

src/network.cpp

@@ -15,6 +15,7 @@ static void _demarrerSTA() {
     WiFi.begin(WIFI_SSID, WIFI_PASS);
     _debutConnexionMs = millis();
     _connexionEnCours = true;
+    netStatus.modeAP  = false; // reset dès la tentative STA
 }
 
 static void _demarrerAP() {
@@ -23,10 +24,12 @@ static void _demarrerAP() {
     WiFi.softAP(AP_SSID, AP_PASS);
     netStatus.modeAP       = true;
     netStatus.wifiConnecte = false;
+    netStatus.rssi         = 0;
     Serial.printf("[WIFI] AP IP: %s\n", WiFi.softAPIP().toString().c_str());
 }
 
 static void _configurerMDNS() {
+    MDNS.end();
     if (MDNS.begin(MDNS_NOM)) {
         MDNS.addService("http", "tcp", 80);
         Serial.printf("[mDNS] Accessible via http://%s.local\n", MDNS_NOM);