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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h

Engine/src/Renderer/Passes/SkyboxPass.cpp

@@ -36,7 +36,7 @@ namespace Engine::Passes
             std::vector<vk::DescriptorSetLayout>{m_SetLayout},
             sizeof(glm::mat4));
 
-        const std::string shaderDir = "shaders/";
+        const std::string shaderDir = "shaders/env/";
         auto vert = shaders.CreateFromFile(
             shaderDir + "skybox.vert.spv",
             vk::ShaderStageFlagBits::eVertex,