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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h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/post/tonemap.vert

@@ -0,0 +1,23 @@
+#version 450
+
+// 全屏三角形：无顶点缓冲，从 gl_VertexIndex 派生 UV。
+//  0 → (-1,3)? 经典三角覆盖整个屏幕：
+//  idx0:(-1,-1) idx1:(3,-1) idx2:(-1,3)，UV 相应 [0..2]，
+//  光栅化插值后屏幕内 UV 恰好落在 [0,1]。
+layout(location = 0) out vec2 fragUV;
+
+// 全屏 pass 通用 push（16B，与 tonemap.frag 及所有全屏 pass 一致，VUID-08878）
+layout(push_constant) uniform PushConstants {
+    float exposure;
+    float aces;
+    float _pad0;
+    float _pad1;
+} pc;
+
+void main() {
+    vec2 p = vec2(
+        float((gl_VertexIndex << 1) & 2),
+        float(gl_VertexIndex & 2));
+    fragUV = p;
+    gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0);
+}