Add enemy respawner and related components for room lifecycle management

- Implemented EnemyRespawner to manage enemy spawning and respawning within rooms.
- Added IRoomLifecycle interface for room activation and dormancy handling.
- Created supporting classes and metadata for enemy perception and threat assessment.
- Established streaming system components for room state management and transitions.
- Added necessary metadata files for new scripts to ensure proper integration with Unity.

Assets/_Game/Scripts/World/IRoomStreamingManager.cs

@@ -45,5 +45,11 @@ namespace BaseGames.World
         /// 用于非流式冷启动路径（如游戏初始化、快速传送落地）。
         /// </summary>
         IEnumerator LoadAndActivateRoomCoroutine(string roomId, SpawnContext context);
+
+        /// <summary>
+        /// 获取指定房间的当前流式状态。
+        /// 若房间不在流式系统中（未加载或 ID 不存在），返回 <see cref="RoomState.Unloaded"/>。
+        /// </summary>
+        RoomState GetRoomState(string roomId);
     }
 }