basic of display management. Backend to register and give image for the device. front end to manage displays etc.

Provider/main/device.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <cstring>
+
+#include "types.hpp"
+
+constexpr int MAX_DEVICES = 8;
+constexpr int DEVICE_XML_MAX = 2048;
+
+struct device_t
+{
+  char mac[18];               // "AA:BB:CC:DD:EE:FF\0"
+  bool active;                // Slot in use
+  char xml_layout[DEVICE_XML_MAX]; // LVGL XML string for the current screen
+};
+
+internal device_t g_Devices[MAX_DEVICES] = {};