refactor(new_editor/app): reorganize host structure and add smoke test

new_editor/app/Rendering/Native/NativeRenderer.cpp

@@ -0,0 +1,9 @@
+#include "NativeRendererSupport.h"
+
+namespace XCEngine::UI::Editor::Host {
+
+// NativeRenderer implementations are split by responsibility into dedicated
+// translation units to keep lifecycle, texture, text, capture, and rendering
+// codepaths isolated.
+
+} // namespace XCEngine::UI::Editor::Host