feat: Implement Room Streaming System

- Add RoomStreamingManager to manage room loading and unloading based on player proximity.
- Create StreamingBudgetConfigSO for memory and performance budgeting of the streaming system.
- Introduce TransitionDirector to handle seamless and atmospheric fade transitions between rooms.
- Develop WorldGraph to represent room connectivity and facilitate neighbor queries and distance calculations.
- Implement RoomNode and RoomEdge classes to structure room data and connections.

Assets/_Game/Scripts/Enemies/AI/BD_EnterPhase.cs

@@ -1,4 +1,4 @@
-#if GRAPH_DESIGNER
+#if GRAPH_DESIGNER
 using Opsive.BehaviorDesigner.Runtime.Tasks;
 using Opsive.BehaviorDesigner.Runtime.Tasks.Actions;
 using BaseGames.Enemies;
@@ -9,22 +9,26 @@ namespace BaseGames.Enemies.AI
     /// BD Action：Boss 切换阶段（Phase）。
     /// 调用 BossBase.EnterPhase(PhaseIndex)，单帧完成，返回 Success。
     /// </summary>
+    [TaskName("Enter Boss Phase")]
+    [TaskCategory("BaseGames/Enemy/Boss")]
+    [TaskDescription("立即切换 Boss 到目标阶段序号（单帧完成）")]
     public class BD_EnterPhase : Action
     {
         [UnityEngine.SerializeField] private int m_PhaseIndex = 1;
 
         private BossBase _boss;
 
+        public override void OnAwake() => _boss = GetComponent<BossBase>();
+
         public override void OnStart()
         {
-            _boss = GetComponent<BossBase>();
+            // 阶段切换是单帧操作，在 OnStart 完成；OnUpdate 仅汇报结果
+            _boss?.EnterPhase(m_PhaseIndex);
         }
 
         public override TaskStatus OnUpdate()
         {
-            if (_boss == null) return TaskStatus.Failure;
-            _boss.EnterPhase(m_PhaseIndex);
-            return TaskStatus.Success;
+            return _boss == null ? TaskStatus.Failure : TaskStatus.Success;
         }
     }
 }