refactor(enemy): 三处卡死检测收敛为 StallDetector;修复 Pace 持续受阻时无法掉头的死锁

Assets/_Game/Scripts/Enemies/Navigation/EnemyNavAgent.cs

@@ -91,9 +91,7 @@ namespace BaseGames.Enemies.Navigation
         private bool  _redirectedToClosest;  // 本轮已改道到最近点，避免每帧重复下发
         private bool  _obstructionSignal;    // 受阻信号(寻路失败/卡死)，延后到 FixedUpdate 统一处理
         // 卡死检测窗口
-        private float _stuckWinTimer;
-        private float _stuckWinStartDist;
-        private bool  _stuckWinInit;
+        private StallDetector _segStall;
 
         // 连接段状态缓存
         private NavLinkType _currentLinkType  = NavLinkType.None;
@@ -121,6 +119,8 @@ namespace BaseGames.Enemies.Navigation
             _navAgent.OnSegmentTraversal   += HandleSegmentTraversal;
             _navAgent.OnFailedToFindPath   += HandlePathFailed;
             _navAgent.OnReachedGoal        += HandleGoalReached;
+
+            _segStall = new StallDetector(_stuckWindowSeconds, _stuckMinProgress);
         }
 
         private void OnDestroy()
@@ -327,30 +327,16 @@ namespace BaseGames.Enemies.Navigation
             _wasNavOnSegment = onSegment;
         }
 
-        // 卡死检测：段上移动时，滑动窗口内朝子目标推进不足阈值 → 判受阻(覆盖"障碍未进图"的物理空推)。
+        // 卡死检测：段上移动时，窗口内净水平位移不足 → 判受阻（覆盖"障碍未进图"的物理空推）。
+        // 原实现比较"到子目标的距离缩小量"，现统一为净水平位移：不依赖子目标，且绕行时不会误判为卡死。
         private void TickStuckDetection(bool onSegment)
         {
-            if (!onSegment) { _stuckWinInit = false; return; }
-
-            float dist = Mathf.Abs(_navAgent.PathSubGoal.x - transform.position.x);
-            if (!_stuckWinInit)
-            {
-                _stuckWinInit      = true;
-                _stuckWinTimer     = 0f;
-                _stuckWinStartDist = dist;
-                return;
-            }
-            _stuckWinTimer += Time.fixedDeltaTime;
-            if (_stuckWinTimer >= _stuckWindowSeconds)
-            {
-                if (_stuckWinStartDist - dist < _stuckMinProgress)
-                    _obstructionSignal = true; // 窗口内几乎没靠近子目标 → 卡死
-                _stuckWinTimer     = 0f;
-                _stuckWinStartDist = dist;
-            }
+            if (!onSegment) { _segStall.Reset(transform.position.x); return; }
+            if (_segStall.Tick(transform.position.x, Time.fixedDeltaTime))
+                _obstructionSignal = true; // 窗口内几乎没推进 → 卡死
         }
 
-        private void ResetStuckWindow() => _stuckWinInit = false;
+        private void ResetStuckWindow() => _segStall.Reset(transform.position.x);
 
         // 统一受阻处理：尽力改道到最近可达点(走到障碍前)，拿不到更近点则停下，交由意图层结算。
         private void ProcessObstruction()