feat(mqtt): add gomesh to broker presets table

src/helpers/MQTTPresets.h

@@ -130,7 +130,7 @@ static const char ISRG_ROOT_X1[] PROGMEM =
     "-----END CERTIFICATE-----\n";
 
 // Number of built-in presets
-static const int MQTT_PRESET_COUNT = 32;
+static const int MQTT_PRESET_COUNT = 33;
 
 // Built-in preset definitions (stored in flash)
 static const MQTTPresetDef MQTT_PRESETS[MQTT_PRESET_COUNT] = {
@@ -174,6 +174,8 @@ static const MQTTPresetDef MQTT_PRESETS[MQTT_PRESET_COUNT] = {
     // LetsMesh-compatible JWT; TLS is Let's Encrypt (ISRG Root X1), not GTS.
     { "wcmesh",        "wss://mqtt.wcmesh.com:443",               "mqtt.wcmesh.com",                 ISRG_ROOT_X1,  MQTT_AUTH_JWT,      MQTT_TOPIC_MESHCORE,  0,       true,   55,      nullptr,     nullptr     },
     { "atvirastinklas","wss://mqtt-mc.atvirastinklas.lt:443",      "mqtt-mc.atvirastinklas.lt",       GTS_ROOT_R4,   MQTT_AUTH_JWT,      MQTT_TOPIC_MESHCORE,  0,       true,   55,      nullptr,     nullptr     },
+    // JWT token auth; LE Gen-Y ECDSA chain (YE2 → Root YE → X2) still anchors at ISRG Root X1.
+    { "gomesh",        "wss://mqtt.gomesh.dev:443",               "mqtt.gomesh.dev",                 ISRG_ROOT_X1,  MQTT_AUTH_JWT,      MQTT_TOPIC_MESHCORE,  0,       true,   55,      nullptr,     nullptr     },
 };
 
 // Find a preset by name, returns nullptr if not found