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/Perception/SensorSlotNames.cs

@@ -0,0 +1,43 @@
+namespace BaseGames.Enemies.Perception
+{
+    /// <summary>
+    /// <see cref="EnemySensorHub"/> 槽位名称常量。
+    ///
+    /// 统一定义字符串键，避免在 BD Task Inspector 和代码中散布魔法字符串。
+    /// Prefab 上 EnemySensorHub 组件的 slotName 字段必须与此处常量保持一致。
+    /// </summary>
+    public static class SensorSlotNames
+    {
+        /// <summary>
+        /// 警戒范围（RangeSensor2D）：玩家进入此圈触发 Alert 阶段。
+        /// 通常半径大于攻击范围，小于视线检测范围。
+        /// </summary>
+        public const string Aggro = "aggro";
+
+        /// <summary>
+        /// 视线检测（LOSSensor2D）：敌我之间无遮挡时持续为 true。
+        /// 由 BatchLOSSystem 批量计算，BD_IsPlayerVisible 读取结果。
+        /// </summary>
+        public const string LOS = "los";
+
+        /// <summary>
+        /// 近战攻击范围（RangeSensor2D）：玩家进入时触发近战攻击条件。
+        /// </summary>
+        public const string AttackMelee = "attack_melee";
+
+        /// <summary>
+        /// 远程攻击范围（RangeSensor2D）：玩家进入时触发远程攻击条件。
+        /// </summary>
+        public const string AttackRange = "attack_range";
+
+        /// <summary>
+        /// 前方墙体（RaySensor2D）：水平方向检测，用于巡逻转向。
+        /// </summary>
+        public const string WallAhead = "wall_ahead";
+
+        /// <summary>
+        /// 前方悬崖（RaySensor2D）：斜向下检测地面是否存在，用于巡逻转向。
+        /// </summary>
+        public const string Ledge = "ledge";
+    }
+}