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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h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/debug/debug_line.vert

@@ -0,0 +1,19 @@
+#version 450
+
+// 物理调试图元：世界空间线段/三角形，颜色透传（unlit）。
+// viewProj 经 push constant 下发（proj × view，与 Forward 同源），
+// 无描述符 set——调试图元不依赖任何纹理/缓冲。
+
+layout(location = 0) in vec3 inPos;
+layout(location = 1) in vec4 inColor;
+
+layout(location = 0) out vec4 outColor;
+
+layout(push_constant) uniform PC {
+    mat4 viewProj;
+} pc;
+
+void main() {
+    gl_Position = pc.viewProj * vec4(inPos, 1.0);
+    outColor = inColor;
+}