Reorganize directory layout: editor panels/, grouped shaders, drop stale header

- App/editor: move 7 panels into panels/ (Editor core stays at root)
- shaders/: group into pbr/ post/ debug/ env/ (runtime load paths updated)
- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h

App/editor/Editor.h

@@ -15,7 +15,7 @@
 #define HELLOVULKAN_EDITOR_H
 
 #include "EditorContext.h"
-#include "ViewportPanel.h"   // ViewportInputState（成员按值持有）
+#include "panels/ViewportPanel.h"   // ViewportInputState（成员按值持有）
 
 #include <Engine/Core/Types.h>   // u32（SelectEntity 位模式转换）