feat(角色): 添加角色阴影渲染功能

新增 CharacterShadowActor 类用于处理角色阴影的渲染
在 CharacterObject 中实现阴影的同步和渲染逻辑
移除 GameDebugActor 中不再使用的合成纹理预览代码
添加 EnsureCompositeTextureReady 方法确保纹理准备就绪

Game/include/common/debug/GameDebugActor.h

@@ -1,14 +1,11 @@
 #pragma once
 
 #include <frostbite2D/2d/actor.h>
-#include <frostbite2D/2d/sprite.h>
-
 namespace frostbite2D {
 
 class CharacterObject;
 class GameMap;
 class NineSliceActor;
-class Sprite;
 class TextSprite;
 
 /**
@@ -36,10 +33,6 @@ private:
   void initOverlay();
   void updateOverlay();
   void updateMapDebugHighlight();
-  void updateCompositePreview();
-  Vec2 computeScreenMatchedPreviewSize(const Vec2& textureSize) const;
-  void updateCompositePreviewMarker(const Vec2& textureSize, const Vec2& previewSize,
-                                    const Vec2& originInTexture);
   void setOverlayVisible(bool visible);
 
   GameDebugActor();
@@ -50,12 +43,6 @@ private:
   RefPtr<NineSliceActor> background_;
   RefPtr<TextSprite> coordText_;
   RefPtr<TextSprite> actionText_;
-  RefPtr<TextSprite> compositeText_;
-  RefPtr<Sprite> compositePreview_;
-  RefPtr<Actor> compositeOriginMarker_;
-  CharacterObject* previewCharacter_ = nullptr;
-  uint64 previewCompositeVersion_ = 0;
-  bool previewTextureAvailable_ = false;
 };
 
 } // namespace frostbite2D