添加 CombatNodeComponent 及相关类

- CombatNodeComponent：节点组件，负责提取并开始关卡
- CombatScheduler：关卡调度器，负责关卡的生命周期调度
- MapEntity：地图实体，提供地图相关的数据
- Spawner：出生点，负责标记地图上的敌人出生点坐标
- House：基地，负责标记地图上的敌人目标点坐标

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