feat(ai): 敌人感知↔状态模型——待机/警觉/追击/巡逻 + 可复用感知状态机

感知门面 EnemyBase.InChaseZone(追逐/aggro)/InVisionZone(视野/los,缺省回退aggro),纯查询;
转换逻辑归 AI 层: 新增可复用 PerceptionStateMachine(统一规则,HasAlert/视野缺省自动降级);
规则: 未发现进视野→警觉, 进追逐→追击(委托能力), 追击脱离视野→巡逻(永不回警觉,再进视野再警觉).
EnemyStatsSO.HasAlertState 勾选项; ContactChaseAbility 改纯执行器(退出由AI中断); E001 用可复用件.
PlayMode 验证四态转换全通过.

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

Assets/_Game/Scripts/Enemies/AIBrain/PerceptionStateMachine.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: d6bbbd575378d614da31905f1178dbf8
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: