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- Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h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

@@ -0,0 +1,29 @@
+#version 450
+
+// Bloom 高斯模糊：可分离 9-tap，方向由 push 给出（H/V 各跑一次）。
+// 源图为半分辨率，线性采样 + 权重对应的偏移天然抗锯齿。
+
+layout(location = 0) in vec2 fragUV;
+layout(location = 0) out vec4 outColor;
+
+layout(set = 0, binding = 0) uniform sampler2D srcImage;
+
+layout(push_constant) uniform PushConstants {
+    float exposure;   // 未用（程序级统一布局）
+    float stepX;      // param0: UV 步长 x（水平 pass = 1/width，垂直 = 0）
+    float stepY;      // param1: UV 步长 y
+    float _pad0;
+} pc;
+
+const float weights[5] = float[](0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
+
+void main() {
+    vec2 off = vec2(pc.stepX, pc.stepY);
+
+    vec3 c = texture(srcImage, fragUV).rgb * weights[0];
+    for (int i = 1; i < 5; ++i) {
+        c += texture(srcImage, fragUV + off * float(i)).rgb * weights[i];
+        c += texture(srcImage, fragUV - off * float(i)).rgb * weights[i];
+    }
+    outColor = vec4(c, 1.0);
+}