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_UseAbility.cs

@@ -0,0 +1,58 @@
+#if GRAPH_DESIGNER
+using UnityEngine;
+using Opsive.BehaviorDesigner.Runtime.Tasks;
+using Opsive.BehaviorDesigner.Runtime.Tasks.Actions;
+using BaseGames.Enemies.Abilities;
+
+namespace BaseGames.Enemies.AI
+{
+    /// <summary>
+    /// 通用：触发能力。OnStart 调用 ability.Execute()，OnUpdate 等待结束。
+    /// 失败条件：能力不存在、能力 CanUse=false 或 Execute 返回 false。
+    /// </summary>
+    [TaskName("Use Ability")]
+    [TaskCategory("BaseGames/Enemy/Combat")]
+    [TaskDescription("触发指定能力（拖拽 EnemyAbilitySO 或填写 ID），等待执行结束")]
+    public sealed class BD_UseAbility : Action
+    {
+        [Tooltip("可直接拖拽 EnemyAbilitySO 资产（推荐），或填写裸字符串 ID 作为兜底")]
+        [SerializeField] private EnemyAbilitySO m_AbilitySO;
+        [SerializeField] private string         m_AbilityId = "";
+
+        private EnemyBase           _enemy;
+        private EnemyAbilityBase    _ability;
+        private bool                _startedSuccessfully;
+
+        public override void OnAwake()
+        {
+            _enemy = gameObject.GetComponent<EnemyBase>();
+        }
+
+        public override void OnStart()
+        {
+            _startedSuccessfully = false;
+            if (_enemy == null) return;
+
+            // SO 拖拽优先；裸字符串兜底
+            string id = m_AbilitySO != null ? m_AbilitySO.abilityId : m_AbilityId;
+            if (string.IsNullOrEmpty(id)) return;
+
+            _ability = _enemy.Abilities.Get(id);
+            if (_ability == null) return;
+            _startedSuccessfully = _ability.Execute();
+        }
+
+        public override TaskStatus OnUpdate()
+        {
+            if (!_startedSuccessfully || _ability == null) return TaskStatus.Failure;
+            return _ability.IsRunning ? TaskStatus.Running : TaskStatus.Success;
+        }
+
+        public override void OnEnd()
+        {
+            _ability = null;
+            _startedSuccessfully = false;
+        }
+    }
+}
+#endif