修复内容：

PlayerMovement：新增 _facingLocked 字段 + LockFacing(bool) 方法；UpdateFacing() 锁定时直接返回
WallSlideState：OnStateEnter 调用 LockFacing(true) + FlipFacing(_wallDir)；OnStateExit 调用 LockFacing(false) 解锁
WallJumpState：OnStateEnter 保险性再调一次 LockFacing(false)；WallJumpAway/Toward 同步写入 _inputVelocityX，确保解锁后 UpdateFacing 朝向正确（背墙跳 = 离墙方向，对墙跳 = 朝墙方向）

Assets/_Game/Scripts/World/InteractableDetector.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using BaseGames.Core.Events;
 using BaseGames.Input;
 using UnityEngine;
@@ -22,8 +23,19 @@ namespace BaseGames.World
         // 预分配检测缓冲区，避免 OverlapCircleAll 每帧 GC 分配
         private readonly Collider2D[] _overlapBuffer = new Collider2D[16];
 
-        private void OnEnable()  => _inputReader.InteractEvent += TryInteract;
-        private void OnDisable() => _inputReader.InteractEvent -= TryInteract;
+        // Collider → IInteractable 缓存，避免 FindNearest 每帧重复 GetComponentInParent
+        private readonly Dictionary<Collider2D, IInteractable> _componentCache = new();
+
+        private void OnEnable()
+        {
+            _inputReader.InteractEvent += TryInteract;
+        }
+
+        private void OnDisable()
+        {
+            _inputReader.InteractEvent -= TryInteract;
+            _componentCache.Clear(); // 清理缓存，防止跨场景持有旧引用
+        }
 
         private void Update()
         {
@@ -57,20 +69,29 @@ namespace BaseGames.World
 
         private IInteractable FindNearest(Collider2D[] hits, int count)
         {
-            IInteractable best     = null;
-            float         bestDist = float.MaxValue;
+            IInteractable best        = null;
+            float         bestSqrDist = float.MaxValue;
 
             for (int i = 0; i < count; i++)
             {
                 var col = hits[i];
-                var interactable = col.GetComponentInParent<IInteractable>();
+                if (col == null) continue;
+
+                // 查缓存，未命中时才调用 GetComponentInParent（避免每帧反射开销）
+                if (!_componentCache.TryGetValue(col, out var interactable))
+                {
+                    interactable = col.GetComponentInParent<IInteractable>();
+                    _componentCache[col] = interactable;
+                }
+
                 if (interactable == null || !interactable.CanInteract) continue;
 
-                float dist = Vector2.Distance(transform.position, col.transform.position);
-                if (dist < bestDist)
+                // 用 sqrMagnitude 比较距离，省去 Distance 的 sqrt 开销
+                float sqrDist = ((Vector2)transform.position - (Vector2)col.transform.position).sqrMagnitude;
+                if (sqrDist < bestSqrDist)
                 {
-                    bestDist = dist;
-                    best     = interactable;
+                    bestSqrDist = sqrDist;
+                    best        = interactable;
                 }
             }