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/EnemyStats.cs

@@ -20,6 +20,17 @@ namespace BaseGames.Enemies
         public int   Defense             { get; private set; }
         public float AttackCooldownTimer { get; private set; }
 
+        // ── 移动速度（透传 SO，供 BD 任务运行时读取）────────────────────────
+        public float WalkSpeed => _config?.WalkSpeed ?? 2f;
+        public float RunSpeed  => _config?.RunSpeed  ?? 4f;
+
+        // ── AI 追击配置（透传 SO）──────────────────────────────────────────
+        public float MaxChaseDistance    => _config?.MaxChaseDistance    ?? 15f;
+        public float LoseLinkTimeout     => _config?.LoseLinkTimeout     ?? 2f;
+        public float AlertDuration       => _config?.AlertDuration       ?? 0.6f;
+        public float InvestigateDuration => _config?.InvestigateDuration ?? 3f;
+        public float HomeRadius          => _config?.HomeRadius          ?? 0.5f;
+
         /// <summary>
         /// 每帧由 EnemyBase 更新（sqrMagnitude，避免 sqrt 开销）。
         /// 使用方请与 range*range 比较，而非直接与 range 比较。
@@ -59,9 +70,10 @@ namespace BaseGames.Enemies
         {
             if (_config == null) return;
             var scaler = ServiceLocator.GetOrDefault<IDifficultyService>()?.CurrentScaler;
-            MaxHP = scaler != null
-                ? Mathf.Max(1, Mathf.RoundToInt(_config.MaxHP * scaler.EnemyHPMultiplier))
+            int raw = scaler != null
+                ? Mathf.RoundToInt(_config.MaxHP * scaler.EnemyHPMultiplier)
                 : _config.MaxHP;
+            MaxHP = Mathf.Max(1, raw);   // 防止 MaxHP=0 导致 HP 比例计算 NaN
         }
 
         public void TakeDamage(int amount)