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_UseBossSkill.cs

@@ -0,0 +1,53 @@
+#if GRAPH_DESIGNER
+using UnityEngine;
+using Opsive.BehaviorDesigner.Runtime.Tasks;
+using Opsive.BehaviorDesigner.Runtime.Tasks.Actions;
+using BaseGames.Boss;
+
+namespace BaseGames.Enemies.AI
+{
+    /// <summary>
+    /// 触发 Boss 技能。OnStart 调用 BossBase.UseBossSkill(skillId)，OnUpdate 等待技能结束。
+    /// 失败条件：非 Boss 敌人、技能 ID 无效、BossSkillExecutor 未就绪或技能执行中。
+    /// </summary>
+    [TaskName("Use Boss Skill")]
+    [TaskCategory("BaseGames/Enemy/Boss")]
+    [TaskDescription("通过技能 ID 执行 Boss 指定技能")]
+    public sealed class BD_UseBossSkill : Action
+    {
+        [SerializeField] private string      m_SkillId  = "";
+        [Tooltip("可选：直接拖拽 BossSkillSO 资产以替代裸字符串（优先于 m_SkillId）")]
+        [SerializeField] private BossSkillSO m_SkillSO;
+
+        private BossBase _boss;
+        private bool     _startedSuccessfully;
+
+        public override void OnAwake()
+        {
+            _boss = gameObject.GetComponent<BossBase>();
+        }
+
+        public override void OnStart()
+        {
+            _startedSuccessfully = false;
+            if (_boss == null) return;
+
+            string id = m_SkillSO != null ? m_SkillSO.skillId : m_SkillId;
+            if (string.IsNullOrEmpty(id)) return;
+
+            _startedSuccessfully = _boss.UseBossSkill(id);
+        }
+
+        public override TaskStatus OnUpdate()
+        {
+            if (!_startedSuccessfully || _boss == null) return TaskStatus.Failure;
+            return _boss.IsBossSkillExecuting ? TaskStatus.Running : TaskStatus.Success;
+        }
+
+        public override void OnEnd()
+        {
+            _startedSuccessfully = false;
+        }
+    }
+}
+#endif