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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h

shaders/env/ibl_equirect_to_cube.comp

@@ -0,0 +1,27 @@
+#version 450
+
+// IBL ①：等距柱状 HDR → 环境 cube（6 面重采样）。
+// 替代原 CPU 逐像素 SampleEquirect 双线性查表——GPU 上直接用硬件
+// 线性过滤采样（经度接缝由 S=eRepeat 处理），观感与 CPU 版一致。
+// 输出为 image2DArray（layer = face），图像本体带 CUBE_COMPATIBLE，
+// 采样端另建 eCube view。
+
+#include "ibl_common.glsl"
+
+layout(local_size_x = 8, local_size_y = 8) in;
+
+layout(set = 0, binding = 0) uniform sampler2D equirect;
+layout(set = 0, binding = 1, rgba16f) uniform restrict writeonly image2DArray outCube;
+
+void main()
+{
+    ivec3 gid = ivec3(gl_GlobalInvocationID);
+    ivec2 size = imageSize(outCube).xy;
+    if (gid.x >= size.x || gid.y >= size.y) return;
+
+    vec2 uv = (vec2(gid.xy) + 0.5) / vec2(size);
+    vec3 dir = iblFaceDir(uint(gid.z), uv.x, uv.y);
+    vec3 rgb = texture(equirect, iblDirToEquirectUv(dir)).rgb;
+
+    imageStore(outCube, gid, vec4(rgb, 1.0));
+}