feat(physics): 集成 Rapier2D 物理引擎并修复预览重置问题 (#244)

* feat(physics): 集成 Rapier2D 物理引擎并修复预览重置问题

* fix: 修复 CI 流程并清理代码

packages/physics-rapier2d/src/index.ts

@@ -0,0 +1,26 @@
+/**
+ * @esengine/physics-rapier2d
+ *
+ * Deterministic 2D physics engine based on Rapier2D with enhanced-determinism support.
+ * 基于 Rapier2D 的确定性 2D 物理引擎。
+ *
+ * 注意：此入口不包含 WASM 依赖，可安全地在编辑器中同步导入。
+ * 运行时模块（含 WASM）请使用 '@esengine/physics-rapier2d/runtime' 导入。
+ *
+ * @packageDocumentation
+ */
+
+// Types (no WASM dependency)
+export * from './types';
+
+// Components (no WASM dependency)
+export * from './components';
+
+// Services (no WASM dependency)
+export * from './services';
+
+// Systems (type only for editor usage)
+export type { Physics2DSystem } from './systems/Physics2DSystem';
+
+// Plugin (for editor, no WASM dependency)
+export { Physics2DPlugin } from './editor/Physics2DPlugin';