feat(渲染): 实现2D渲染风格系统

添加渲染风格预设配置，支持像素风、平滑2D和混合模式
新增纹理采样控制、顶点像素对齐和UV收缩优化
为相机和场景添加渲染风格覆盖功能

Frostbite2D/include/frostbite2D/graphics/camera.h

@@ -7,32 +7,37 @@ namespace frostbite2D {
 class Camera {
 public:
   Camera();
-  
+
   void setPosition(const Vec2& pos);
   void setZoom(float zoom);
   void setViewport(int width, int height);
-  void setFlipY(bool flip) { flipY_ = flip; } // 调试用：Y轴翻转开关
-  
+  void setFlipY(bool flip) { flipY_ = flip; } // Debug Y-axis flip.
+  void setPixelSnapEnabled(bool enabled) { pixelSnapEnabled_ = enabled; }
+
   const Vec2& getPosition() const { return position_; }
+  Vec2 getRenderPosition() const;
+  Vec2 snapWorldPosition(const Vec2& position) const;
   float getZoom() const { return zoom_; }
   int getViewportWidth() const { return viewportWidth_; }
   int getViewportHeight() const { return viewportHeight_; }
   float getVisibleWidth() const;
   float getVisibleHeight() const;
-  
+  bool isPixelSnapEnabled() const { return pixelSnapEnabled_; }
+
   void lookAt(const Vec2& target);
   void move(const Vec2& delta);
   void zoomAt(float factor, const Vec2& screenPos);
-  
+
   glm::mat4 getViewMatrix() const;
   glm::mat4 getProjectionMatrix() const;
-  
- private:
+
+private:
   Vec2 position_;
   float zoom_ = 1.0f;
   int viewportWidth_ = 1280;
   int viewportHeight_ = 720;
-  bool flipY_ = false; // 调试用：Y轴翻转开关
+  bool flipY_ = false; // Debug Y-axis flip.
+  bool pixelSnapEnabled_ = false;
 };
 
-}
+} // namespace frostbite2D