refactor: Introduce script engine and related services for enhanced scripting capabilities

src/services/impl/gui_script_service.cpp

@@ -0,0 +1,22 @@
+#include "gui_script_service.hpp"
+#include <utility>
+
+namespace sdl3cpp::services::impl {
+
+GuiScriptService::GuiScriptService(std::shared_ptr<IScriptEngineService> engineService)
+    : engineService_(std::move(engineService)) {
+}
+
+std::vector<script::GuiCommand> GuiScriptService::LoadGuiCommands() {
+    return engineService_->GetEngine().LoadGuiCommands();
+}
+
+void GuiScriptService::UpdateGuiInput(const script::GuiInputSnapshot& input) {
+    engineService_->GetEngine().UpdateGuiInput(input);
+}
+
+bool GuiScriptService::HasGuiCommands() const {
+    return engineService_->GetEngine().HasGuiCommands();
+}
+
+}  // namespace sdl3cpp::services::impl