Add animation controller system, material assets and skeleton visualization

- .animctrl state machine asset (params/transitions/blend trees, 1D+2D
  directional blending) with Unity Animator-style editor panel: state
  list, transitions, params, directional pad preview driving live
  CrossFade on the selected entity
- Split animation evaluation out of SceneRenderer into
  AnimationSystem/AnimationEvaluator; skin palettes with rest-pose
  fallback and blend-weight epsilon filtering
- MaterialAsset (.material) with reload-safe preview tile pool
  (DropMaterial clears dirty refs before instance destruction)
- EditorGizmoPass skeleton wires + viewport joint overlay; camera
  projection rework (baked Vulkan Y-flip, ortho support)
- Editor/game build split via HELLOVULKAN_EDITOR option

Engine/CMakeLists.txt

@@ -50,6 +50,15 @@ endif()
 # ============ Engine ============
 
 file(GLOB_RECURSE ENGINE_SOURCES CONFIGURE_DEPENDS src/*.cpp)
+
+# game 构建（HELLOVULKAN_EDITOR=OFF）：editor 专属 pass 整 TU 不进产物
+#（材质球预览 / Editor gizmo——对应头文件只含声明，无符号产出）
+if(NOT HELLOVULKAN_EDITOR)
+    list(REMOVE_ITEM ENGINE_SOURCES
+            ${CMAKE_CURRENT_SOURCE_DIR}/src/Renderer/Passes/MaterialPreviewPass.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/src/Renderer/Passes/EditorGizmoPass.cpp)
+endif()
+
 add_library(Engine STATIC ${ENGINE_SOURCES})
 
 # PhysicsDebugDraw 派生 Jolt::DebugRendererSimple：Jolt 以 -fno-rtti 编译
@@ -79,3 +88,9 @@ target_link_libraries(Engine PUBLIC
         tracy)
 
 target_compile_definitions(Engine PRIVATE VULKAN_HPP_DISPATCH_LOADER_DYNAMIC=1)
+
+# editor/game 编译期分离：HELLO_EDITOR=1 时预览子系统 + 编辑器消费端编译
+#（PUBLIC——App 层 main.cpp 的编辑器装配同样按此宏裁剪）
+if(HELLOVULKAN_EDITOR)
+    target_compile_definitions(Engine PUBLIC HELLO_EDITOR=1)
+endif()