Refactor LVGL code into kernel module (#472)

* **New Features**
  * Added a standalone LVGL module and enabled LVGL support in the simulator for richer local UI testing.

* **Refactor**
  * HAL and LVGL split into distinct modules; startup and device attach/detach flows reorganized for clearer lifecycle management.
  * Public APIs tightened with clearer nullability/documentation.

* **Bug Fixes**
  * More consistent LVGL start/stop and device attach/detach behavior for improved stability.

Tactility/Source/service/loader/Loader.cpp

@@ -18,7 +18,7 @@
 
 namespace tt::service::loader {
 
-static const auto LOGGER = Logger("Boot");
+static const auto LOGGER = Logger("Loader");
 
 constexpr auto LOADER_TIMEOUT = (100 / portTICK_PERIOD_MS);
 
@@ -297,7 +297,7 @@ void LoaderService::stopAll(const std::string& id) {
     });
 }
 
-std::shared_ptr<app::AppContext> _Nullable LoaderService::getCurrentAppContext() {
+std::shared_ptr<app::AppContext> LoaderService::getCurrentAppContext() {
     const auto lock = mutex.asScopedLock();
     lock.lock();
     if (appStack.empty()) {
@@ -318,7 +318,7 @@ bool LoaderService::isRunning(const std::string& id) const {
     return false;
 }
 
-std::shared_ptr<LoaderService> _Nullable findLoaderService() {
+std::shared_ptr<LoaderService> findLoaderService() {
     return service::findServiceById<LoaderService>(manifest.id);
 }