feat(enemy): 目标点吸附统一处理导航宽度,Waypoint 不再卡崖边

将"角色导航宽度"收口到导航执行层单一入口,意图层(Locomotion/AI)只递原始目标、不再感知身体尺寸:

- NavAgent 新增 TryGetStandablePointNear:把世界点映射到最近可行走段并按 endMargin 内缩两端(与 SetRandomDestinationOnCurrentSegment 同源)
- EnemyNavAgent 新增 ResolveStandablePoint,以 EnemyMovement.EdgeSafeMargin(半宽+落崖余量)为唯一宽度真源;加 _goalMapSearchRadius
- IPathAgent 暴露 ResolveStandablePoint;FlyingDirectNavigator 原样返回(飞行无崖沿约束),NullPathAgent 空实现
- EnemyLocomotion Waypoint 分支改用吸附后的可达点做移动与到达判定,修复路点摆在空中/崖外时永不到达而卡死;吸附失败显式报错暴露误配,不静默兜底

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -38,6 +38,8 @@ namespace BaseGames.Enemies
         private int _wpIndex = -1;
         private int _wpDir = 1;
         private bool _warnedNoWaypoints;
+        // 当前路点吸附后的"站得住"目标（宽度由 Nav 层解析，本层不感知身体尺寸）
+        private Vector2 _wpResolvedGoal;
         // Wander 到点停顿状态
         private bool _wanderPausing;
         private float _wanderPauseTimer;
@@ -193,16 +195,34 @@ namespace BaseGames.Enemies
                     }
                     // 仅首次或"已到达当前路点"时推进并寻路——不依赖 IsMoving
                     // （PathBerserker2d 寻路跨帧异步，IsMoving 在寻路计算期间为 false，会误触发每帧推进）。
+                    // 到达判定对"吸附后的可达点"做，而非原始路点：原始路点可能摆在空中/崖外，
+                    // 与之的距离永远进不了到达半径 → 卡死；吸附点是身体站得住的可达点。
                     if (_wpIndex < 0 ||
-                        Vector2.Distance(_enemy.transform.position, _waypoints[_wpIndex].position) <= _waypointArriveRadius)
+                        Vector2.Distance(_enemy.transform.position, _wpResolvedGoal) <= _waypointArriveRadius)
                     {
                         AdvanceWaypoint();
-                        _enemy.MoveTo(_waypoints[_wpIndex].position);
+                        SetWaypointGoal();
                     }
                     break;
             }
         }
 
+        /// <summary>
+        /// 解析当前路点为"身体站得住的可达点"并出发。宽度处理下沉给 Nav 层（<see cref="IPathAgent.ResolveStandablePoint"/>），
+        /// 本层只递原始路点坐标、不感知身体尺寸。吸附失败＝路点摆得离导航面太远，显式报错暴露根因，不静默兜底。
+        /// </summary>
+        private void SetWaypointGoal()
+        {
+            Vector2 raw = _waypoints[_wpIndex].position;
+            if (_enemy.Nav == null || !_enemy.Nav.ResolveStandablePoint(raw, out _wpResolvedGoal))
+            {
+                _wpResolvedGoal = raw;
+                Debug.LogWarning($"[EnemyLocomotion] 路点 '{_waypoints[_wpIndex].name}'(index {_wpIndex}) 无法吸附到任何可行走导航段" +
+                                 "（超出搜索半径）。请检查该路点是否摆放在贴近地面/平台的可行走处。", this);
+            }
+            _enemy.MoveTo(_wpResolvedGoal);
+        }
+
         private void AdvanceWaypoint()
         {
             if (_pingPong)