增加摄像机

client/core/eval/ProjectEvaluator.h

@@ -19,9 +19,14 @@ struct ResolvedTool {
     double opacity = 1.0;          // 0..1
 };
 
+struct ResolvedCamera {
+    core::Project::Camera camera;  // 拷贝：centerWorld / viewScale 已替换为求值后的值
+};
+
 struct ResolvedProjectFrame {
     QVector<ResolvedEntity> entities;
     QVector<ResolvedTool> tools;
+    QVector<ResolvedCamera> cameras;
 };
 
 /// 逐帧求值：处理父子跟随与工具可见性淡入淡出。