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/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