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_IsOnNavLink.cs

@@ -0,0 +1,35 @@
+#if GRAPH_DESIGNER
+using UnityEngine;
+using Opsive.BehaviorDesigner.Runtime.Tasks;
+using Opsive.BehaviorDesigner.Runtime.Tasks.Conditionals;
+using BaseGames.Enemies;
+
+namespace BaseGames.Enemies.AI
+{
+    /// <summary>
+    /// 条件：NavAgent 当前是否正在穿越连接段（跳跃/下落/爬梯/传送等）。
+    /// 可选过滤具体连接类型（填 None = 任意类型均匹配）。
+    /// </summary>
+    [TaskName("Is On NavLink?")]
+    [TaskCategory("BaseGames/Enemy/State")]
+    [TaskDescription("检查 NavAgent 当前是否正在穿越 NavLink（如跳跃传送门）")]
+    public sealed class BD_IsOnNavLink : Conditional
+    {
+        [Tooltip("填 None 匹配任意类型；填具体类型则只在该类型时 Success。")]
+        [SerializeField] private NavLinkType m_FilterType = NavLinkType.None;
+
+        private EnemyBase _enemy;
+
+        public override void OnAwake() => _enemy = gameObject.GetComponent<EnemyBase>();
+
+        public override TaskStatus OnUpdate()
+        {
+            if (_enemy?.Nav == null) return TaskStatus.Failure;
+            if (!_enemy.Nav.IsOnLink) return TaskStatus.Failure;
+            if (m_FilterType != NavLinkType.None && _enemy.Nav.CurrentLinkType != m_FilterType)
+                return TaskStatus.Failure;
+            return TaskStatus.Success;
+        }
+    }
+}
+#endif