材质表面参数接通：新增 emissiveFactor（无 emissive 贴图时的发光入口，glTF 语义）入 UBO/YAML/缓存键/两 shader；Transmission/Thickness 未勾 Transparent 时禁用编辑（不透明段 shader 不读）

Engine/src/Renderer/MaterialAsset.cpp

@@ -84,6 +84,8 @@ namespace Engine
         EmitVec4(out, data.params.baseColor);
         out << YAML::Key << "Surface" << YAML::Value;
         EmitVec4(out, data.params.surface);
+        out << YAML::Key << "EmissiveFactor" << YAML::Value;
+        EmitVec4(out, data.params.emissiveFactor);
         out << YAML::Key << "Misc" << YAML::Value;
         EmitVec4(out, data.params.misc);
         // per-slot UV 变换（KHR_texture_transform）：6 槽各 A(4 分量) + T
@@ -145,6 +147,8 @@ namespace Engine
             m["BaseColor"], MaterialParams{}.baseColor);
         out.params.surface = ReadVec4(
             m["Surface"], MaterialParams{}.surface);
+        out.params.emissiveFactor = ReadVec4(
+            m["EmissiveFactor"], MaterialParams{}.emissiveFactor);
         out.params.misc = ReadVec4(
             m["Misc"], MaterialParams{}.misc);
         for (u32 slot = 0; slot < Material::kSlotCount; ++slot) {