refactor(enemy): 删除 AiPhase 影子层，动画统一由 locomotion/反应态/能力驱动

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

Assets/_Game/Scripts/Enemies/Abilities/AnimatedCeilingDropAbility.cs

@@ -1,5 +1,6 @@
 using System.Collections;
 using Animancer;
+using BaseGames.AI;
 using UnityEngine;
 
 namespace BaseGames.Enemies.Abilities
@@ -67,8 +68,8 @@ namespace BaseGames.Enemies.Abilities
 
             yield return EnemyAbilityWaits.Get(_recoveryTime);
 
-            // SetAiPhase(Patrol) 自动播放 AnimConfig.Walk（地面移动动画）
-            _enemy.SetAiPhase(AiPhase.Patrol);
+            // PlayLocomotionClip(Patrol) 播放 AnimConfig.Walk（地面移动动画）
+            _enemy.PlayLocomotionClip(LocomotionMode.Patrol);
         }
 
         private bool IsGrounded()

Assets/_Game/Scripts/Enemies/Abilities/AppearAbility.cs

@@ -19,7 +19,6 @@ namespace BaseGames.Enemies.Abilities
 
             _animancer.Play(_appearClip);
             yield return EnemyAbilityWaits.Get(_appearClip.Clip.length);
-            _enemy.SetAiPhase(AiPhase.Combat);
         }
     }
 }

Assets/_Game/Scripts/Enemies/Abilities/ContactChaseAbility.cs

@@ -22,11 +22,11 @@ namespace BaseGames.Enemies.Abilities
         protected override IEnumerator ExecuteCoroutine()
         {
             Phase = AbilityRunState.Active;
+            _enemy.SetEngaged(true);
 
             // 追击行为的速度/阶段声明归本能力（AI 只触发能力，不做这些执行）
             if (_enemy.Nav != null && _enemy.Stats != null)
                 _enemy.Nav.SetSpeed(_enemy.Stats.RunSpeed);
-            _enemy.SetAiPhase(AiPhase.Chase);
 
             if (_loopClip.Clip != null)
                 _animancer.Play(_loopClip);
@@ -55,6 +55,7 @@ namespace BaseGames.Enemies.Abilities
         {
             if (_contactDamage != null)
                 _contactDamage.enabled = false;
+            _enemy.SetEngaged(false);
             _enemy.Locomotion?.Stop();
         }
     }