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/IPathAgent.cs

@@ -3,6 +3,20 @@ using UnityEngine;
 
 namespace BaseGames.Enemies
 {
+    // ── 连接段类型（映射 PB2d LinkTypeName 字符串）───────────────────────
+    public enum NavLinkType
+    {
+        None,
+        Segment,  // 普通地面/平台段
+        Jump,
+        Fall,
+        Corner,
+        Climb,
+        Elevator,
+        Teleport,
+        Custom
+    }
+
     /// <summary>
     /// 导航代理抽象接口（架构 07_EnemyModule §5）。
     /// EnemyBase 和 BD Task 只依赖此接口，不依赖具体导航库。
@@ -10,6 +24,7 @@ namespace BaseGames.Enemies
     /// </summary>
     public interface IPathAgent
     {
+        // ── 核心移动 ────────────────────────────────────────────────────
         /// <summary>请求移动到世界坐标 target。</summary>
         void RequestMoveTo(Vector2 target);
 
@@ -28,8 +43,37 @@ namespace BaseGames.Enemies
         /// <summary>是否接近平台边缘（脚下或前方无地面时为 true）。</summary>
         bool IsNearEdge();
 
+        // ── 连接段感知（NavLink 平台跳跃/爬梯/传送）─────────────────────
+        /// <summary>当前是否正在穿越连接段（跳跃/下落/爬梯等）。</summary>
+        bool IsOnLink { get; }
+
+        /// <summary>当前正在穿越的连接段类型；不在连接段时为 None。</summary>
+        NavLinkType CurrentLinkType { get; }
+
+        /// <summary>当前连接段的起始世界坐标；不在连接段时为 Vector2.zero。</summary>
+        Vector2 CurrentLinkStart { get; }
+
+        /// <summary>当前连接段的目标世界坐标；不在连接段时为 Vector2.zero。</summary>
+        Vector2 CurrentLinkEnd { get; }
+
+        /// <summary>检查目标是否可以从当前位置导航到达（同步轻量查询）。</summary>
+        bool CanReach(Vector2 target);
+
+        /// <summary>移动到随机可到达点（巡逻 fallback）。</summary>
+        bool WalkToRandom();
+
+        // ── 连接段事件 ──────────────────────────────────────────────────
+        /// <summary>开始穿越连接段时触发（传入连接段类型）。</summary>
+        event Action<NavLinkType> OnLinkStarted;
+
+        /// <summary>连接段穿越完成时触发。</summary>
+        event Action<NavLinkType> OnLinkCompleted;
+
         /// <summary>路径寻路失败事件（目标不可达时触发）。</summary>
         event Action OnNavPathFailed;
+
+        /// <summary>到达目标事件（替代轮询 IsAtDestination）。</summary>
+        event Action OnGoalReached;
     }
 
     // ── 无导航 / 测试用空实现 ─────────────────────────────────────────────
@@ -41,6 +85,15 @@ namespace BaseGames.Enemies
         public void SetSpeed(float _)        { }
         public bool IsMoving                 => false;
         public bool IsNearEdge()             => false;
-        public event Action OnNavPathFailed  { add { } remove { } }
+        public bool IsOnLink                 => false;
+        public NavLinkType CurrentLinkType   => NavLinkType.None;
+        public Vector2 CurrentLinkStart      => Vector2.zero;
+        public Vector2 CurrentLinkEnd        => Vector2.zero;
+        public bool CanReach(Vector2 _)      => false;
+        public bool WalkToRandom()           => false;
+        public event Action<NavLinkType> OnLinkStarted  { add { } remove { } }
+        public event Action<NavLinkType> OnLinkCompleted{ add { } remove { } }
+        public event Action OnNavPathFailed              { add { } remove { } }
+        public event Action OnGoalReached                { add { } remove { } }
     }
 }