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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h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

@@ -0,0 +1,21 @@
+#version 450
+
+// Editor gizmo 拾取顶点：与 billboard 共享同一 ring VB（pos/color/aux
+// + entityId 四属性流），画进 HitProxy 的 R32Uint 目标。只有 entityId
+// 参与变换输出，color/aux 声明占位（属性流绑定时全开）。
+
+layout(location = 0) in vec3 inPos;
+layout(location = 1) in vec4 inColor;    // 占位（拾取不用）
+layout(location = 2) in vec4 inAux;      // 占位
+layout(location = 3) in uint inEntityId;
+
+layout(location = 0) flat out uint outEntityId;
+
+layout(push_constant) uniform PC {
+    mat4 viewProj;
+} pc;
+
+void main() {
+    gl_Position = pc.viewProj * vec4(inPos, 1.0);
+    outEntityId = inEntityId;
+}