升级项目框架，移除大部分无用的物理和tween系统

source/src/ECS/index.ts

@@ -0,0 +1,8 @@
+// Core目录已删除，直接导出核心类
+export { Entity } from './Entity';
+export { Component } from './Component';
+export { Transform } from './Transform';
+export { CoreEvents } from './CoreEvents';
+export * from './Systems';
+export * from './Utils';
+export { Scene } from './Scene';