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/BDTaskAttributes.cs

@@ -0,0 +1,37 @@
+#if GRAPH_DESIGNER
+using System;
+
+namespace BaseGames.Enemies.AI
+{
+    /// <summary>
+    /// 指定 BD Task 在编辑器任务面板中显示的名称。
+    /// 本版本 BehaviorDesigner 不内置此特性，由项目自行定义以保持代码可读性与前向兼容性。
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+    public sealed class TaskNameAttribute : Attribute
+    {
+        public string Name { get; }
+        public TaskNameAttribute(string name) => Name = name;
+    }
+
+    /// <summary>
+    /// 指定 BD Task 在编辑器任务面板中所属分类（路径形式，如 "BaseGames/Enemy/Combat"）。
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+    public sealed class TaskCategoryAttribute : Attribute
+    {
+        public string Category { get; }
+        public TaskCategoryAttribute(string category) => Category = category;
+    }
+
+    /// <summary>
+    /// 为 BD Task 提供编辑器 Tooltip 描述文本。
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+    public sealed class TaskDescriptionAttribute : Attribute
+    {
+        public string Description { get; }
+        public TaskDescriptionAttribute(string description) => Description = description;
+    }
+}
+#endif