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

App/CMakeLists.txt

@@ -6,7 +6,13 @@ file(GLOB EDITOR_SOURCES CONFIGURE_DEPENDS
 file(GLOB SCRIPT_SOURCES CONFIGURE_DEPENDS
         ${CMAKE_CURRENT_SOURCE_DIR}/scripts/*.cpp)
 
-add_executable(HelloVulkan main.cpp ${EDITOR_SOURCES} ${SCRIPT_SOURCES})
+# editor 形态（HELLOVULKAN_EDITOR=ON）编入 editor/（docking 编辑器）；
+# game 形态只有 main + scripts（编辑器源码整体不进产物）
+if(HELLOVULKAN_EDITOR)
+    add_executable(HelloVulkan main.cpp ${EDITOR_SOURCES} ${SCRIPT_SOURCES})
+else()
+    add_executable(HelloVulkan main.cpp ${SCRIPT_SOURCES})
+endif()
 
 target_include_directories(HelloVulkan PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/editor)