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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h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

@@ -0,0 +1,28 @@
+#version 450
+
+// TemporalDiff：帧历史链路调试视图。
+// 输出 |上一帧 HDR − 当前帧 HDR| × 增益：
+//   - 静止画面应接近纯黑（两帧内容一致）
+//   - 运动的实体边缘发光（时域差异可见）
+//   - 全屏噪声 / 错位残影 = 帧历史 barrier 或槽位镜像绑定错误
+// 这是 RenderGraph 帧历史资源（ReadHistory）的验证消费端。
+
+layout(location = 0) in vec2 fragUV;
+layout(location = 0) out vec4 outColor;
+
+layout(set = 0, binding = 0) uniform sampler2D prevImage;   // 帧历史（上一帧槽位镜像）
+layout(set = 0, binding = 1) uniform sampler2D currImage;   // 当前帧
+
+// 全屏 pass 通用 push（16B，程序级统一声明，VUID-08878）
+layout(push_constant) uniform PushConstants {
+    float exposure;   // 与其它全屏 pass 布局一致（本 pass 不用）
+    float gain;       // 差异增益
+    float param1;
+    float param2;
+} pc;
+
+void main() {
+    vec3 prev = texture(prevImage, fragUV).rgb;
+    vec3 curr = texture(currImage, fragUV).rgb;
+    outColor = vec4(abs(prev - curr) * pc.gain, 1.0);
+}