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_MoveToAndWait.cs

@@ -0,0 +1,58 @@
+#if GRAPH_DESIGNER
+using UnityEngine;
+using Opsive.BehaviorDesigner.Runtime.Tasks;
+using Opsive.BehaviorDesigner.Runtime.Tasks.Actions;
+using BaseGames.Enemies;
+
+namespace BaseGames.Enemies.AI
+{
+    /// <summary>
+    /// 动作：移动到目标并等待 OnGoalReached 事件（事件驱动，替代轮询版 BD_MoveTo）。
+    /// OnGoalReached 触发后返回 Success；路径失败返回 Failure。
+    /// </summary>
+    [TaskName("Move To And Wait")]
+    [TaskCategory("BaseGames/Enemy/Movement")]
+    [TaskDescription("导航到目标点，到达后原地等待指定时长，然后返回 Success")]
+    public sealed class BD_MoveToAndWait : Action
+    {
+        [SerializeField] private Transform m_Target;
+
+        private EnemyBase _enemy;
+        private bool      _reached;
+        private bool      _failed;
+
+        public override void OnAwake() => _enemy = gameObject.GetComponent<EnemyBase>();
+
+        public override void OnStart()
+        {
+            _reached = _failed = false;
+            if (_enemy?.Nav == null) { _failed = true; return; }
+            _enemy.Nav.OnGoalReached    += HandleReached;
+            _enemy.Nav.OnNavPathFailed  += HandleFailed;
+            var pos = m_Target != null ? (Vector2)m_Target.position
+                     : _enemy.PlayerTransform != null ? (Vector2)_enemy.PlayerTransform.position
+                     : (Vector2)transform.position;
+            _enemy.Nav.RequestMoveTo(pos);
+        }
+
+        public override TaskStatus OnUpdate()
+        {
+            if (_failed)  return TaskStatus.Failure;
+            if (_reached) return TaskStatus.Success;
+            return TaskStatus.Running;
+        }
+
+        public override void OnEnd()
+        {
+            if (_enemy?.Nav != null)
+            {
+                _enemy.Nav.OnGoalReached   -= HandleReached;
+                _enemy.Nav.OnNavPathFailed -= HandleFailed;
+            }
+        }
+
+        private void HandleReached() => _reached = true;
+        private void HandleFailed()  => _failed  = true;
+    }
+}
+#endif