feat: add cross-engine runtime support

package.json

@@ -1,6 +1,6 @@
 {
   "name": "com.cneicy.shrink-tutorial",
-  "version": "0.1.4",
+  "version": "0.2.0",
   "displayName": "ShrinkTutorial",
   "description": "面向 Unity 的互动式新手引导系统，提供数据驱动教程、遮罩挖洞、动态锚点、步骤条件与运行时调度。",
   "unity": "2022.3",