Checkpoint 2：

- 调整 SimulationWorld 作为 GameFrameworkComponent 组件
- ProcedureGame 接入 SimulationWorld 生命周期（创建/清理）并在敌人 Show/Hide 时同步注册/反注册
- 增加 EnemySimData 构建与缓存去重移除，避免重复注册和悬空映射
- SimulationWorld 增加 UpsertEnemy/UpsertProjectile/UpsertPickup，支持幂等注册

Assets/Launcher.unity

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