feat(npc): 添加NPC交互高亮效果及复合纹理支持

实现NPC交互时的绿色高亮效果，通过InteractionHighlightSprite类实现
重构NpcAnimation支持复合纹理渲染，优化高亮效果的性能
添加ShaderManager获取所有加载Shader的方法，优化渲染器uniform更新逻辑

Game/include/common/InteractionHighlightSprite.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <frostbite2D/2d/sprite.h>
+
+namespace frostbite2D {
+
+class InteractionHighlightSprite : public Sprite {
+public:
+  InteractionHighlightSprite();
+
+  void SetGroundAnchorInTexture(const Vec2& groundAnchorInTexture);
+
+protected:
+  void ConfigureShader(Shader* shader) const override;
+
+private:
+  Vec2 texelSize_ = Vec2::One();
+};
+
+} // namespace frostbite2D

Game/include/npc/NpcAnimation.h

@@ -2,6 +2,7 @@
 
 #include "npc/NpcDataLoader.h"
 #include <frostbite2D/2d/actor.h>
+#include <frostbite2D/2d/canvas_actor.h>
 #include <frostbite2D/animation/animation.h>
 #include <string>
 
@@ -9,17 +10,47 @@ namespace frostbite2D {
 
 class NpcAnimation : public Actor {
 public:
+  struct CompositeFrameInfo {
+    bool valid = false;
+    Rect localBounds;
+    Vec2 originInTexture = Vec2::Zero();
+    Vec2 groundAnchorInTexture = Vec2::Zero();
+    int width = 1;
+    int height = 1;
+  };
+
   bool Init(const npc::NpcConfig& config);
+  void Update(float deltaTime) override;
+  void Render() override;
   void SetDirection(int direction);
   bool IsReady() const { return displayAnimation_ != nullptr; }
   bool IsAnimationFinished() const;
   const std::string& GetAnimationPath() const { return animationPath_; }
   bool GetDisplayLocalBounds(Rect& outBounds) const;
+  bool EnsureCompositeTextureReady();
+  bool HasCompositeTexture() const;
+  Ptr<Texture> GetCompositeTexture() const;
+  Vec2 GetCompositeTextureSize() const;
+  Vec2 GetCompositeGroundAnchorInTexture() const;
+  uint64 GetCompositeVersion() const { return compositeVersion_; }
 
 private:
+  CompositeFrameInfo ComputeCompositeFrameInfo(int direction) const;
+  CompositeFrameInfo GetCurrentCompositeFrameInfo() const { return compositeFrameInfo_; }
+  uint64 CaptureCurrentRenderSignature() const;
+  void MarkCompositeDirty();
+  void UpdateCompositeCamera();
+  void RefreshCompositeTextureIfNeeded();
+  void RenderCurrentAnimationToCompositeCanvas();
+
   RefPtr<Animation> displayAnimation_ = nullptr;
+  RefPtr<CanvasActor> compositeCanvas_ = nullptr;
+  CompositeFrameInfo compositeFrameInfo_;
   std::string animationPath_;
   int direction_ = 1;
+  bool compositeDirty_ = true;
+  uint64 compositeVersion_ = 0;
+  uint64 lastCompositeSignature_ = 0;
 };
 
 } // namespace frostbite2D

Game/include/npc/NpcObject.h

@@ -1,9 +1,10 @@
 #pragma once
 
 #include "character/CharacterActionTypes.h"
+#include "common/InteractionHighlightSprite.h"
 #include "npc/NpcAnimation.h"
-#include <frostbite2D/2d/text_sprite.h>
 #include <frostbite2D/2d/actor.h>
+#include <frostbite2D/2d/text_sprite.h>
 #include <array>
 #include <optional>
 #include <string>
@@ -21,11 +22,13 @@ public:
   void SetNpcPosition(const Vec2& pos);
   void SetWorldPosition(const CharacterWorldPosition& pos);
   void SetInteractable(bool interactable);
+  void SetInteractionHighlighted(bool highlighted);
   void BeginInteract();
   void EndInteract();
 
   bool CanInteract() const;
   bool IsInteracting() const { return interacting_; }
+  bool IsInteractionHighlighted() const { return interactionHighlighted_; }
   int GetNpcId() const { return npcId_; }
   int GetDirection() const { return direction_; }
   const std::string& GetName() const;
@@ -41,8 +44,10 @@ public:
   void Update(float deltaTime) override;
 
 private:
+  void EnsureInteractionHighlight();
   void EnsureNameLabel();
   void RefreshNameLabel();
+  void SyncInteractionHighlight();
   void SyncActorPositionFromWorld();
 
   int npcId_ = -1;
@@ -50,10 +55,13 @@ private:
   CharacterWorldPosition worldPosition_;
   std::optional<npc::NpcConfig> config_;
   RefPtr<NpcAnimation> animation_ = nullptr;
+  RefPtr<InteractionHighlightSprite> interactionHighlight_ = nullptr;
   std::array<RefPtr<TextSprite>, 8> nameOutlineLabels_;
   RefPtr<TextSprite> nameLabel_ = nullptr;
   bool interactable_ = true;
   bool interacting_ = false;
+  bool interactionHighlighted_ = false;
+  uint64 syncedHighlightCompositeVersion_ = 0;
 };
 
 } // namespace frostbite2D