Add grid and EVSE meter components with load balancer

components/meter_orno_modbus/src/orno_modbus.c

@@ -0,0 +1,21 @@
+#include "orno_modbus.h"
+#include "esp_log.h"
+
+static const char *TAG = "orno_modbus";
+
+esp_err_t orno_modbus_init(void)
+{
+    ESP_LOGI(TAG, "Initializing ORNO Modbus driver");
+    return ESP_OK;
+}
+
+esp_err_t orno_modbus_read_current(orno_meter_type_t type, float *current)
+{
+    if (!current) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    // Stub implementation - replace with real Modbus queries
+    *current = 0.0f;
+    ESP_LOGD(TAG, "Read current type %d -> %f", type, *current);
+    return ESP_OK;
+}