refactor(EnemyManager): 性能优化与并发安全修复

- EnemyRegistry: 移除List冗余存储, Register/Remove从O(n)→O(1)
- 增加PruneInvalidEntries显式清理接口, 消除TryGet副作用
- Remove增加不存在告警, 防重复减成负数
- 增加CTS取消飞行中的异步生成, 关卡切换时取消+重建
- ClearEnemies先快照再遍历, 防Hide回调修改集合抛异常
- entityId去掉取模复用, 直接自增保证唯一
- Enemy EntityGroup调优: Capacity→10000, ReleaseInterval→30, ExpireTime→120

Assets/GameMain/Scripts/Runtime/CustomComponent/EnemyManager/EnemyManagerComponent.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading;
 using Cysharp.Threading.Tasks;
 using SepCore.DataTable;
 using SepCore.Definition;
@@ -19,7 +20,7 @@ namespace SepCore.EnemyManager
         private EnemyRegistry _enemyRegistry;
         private EnemySpawnScheduler _spawnScheduler;
 
-        public List<EntityBase> Enemies => _enemyRegistry?.Enemies;
+        public IReadOnlyCollection<EntityBase> Enemies => _enemyRegistry?.Enemies;
 
         [SerializeField] private int _spawnEnemyMaxCount = 5000;
         [SerializeField] private int _spawnDistanceFromPlayer = 20;
@@ -31,6 +32,7 @@ namespace SepCore.EnemyManager
 
         private Transform _player;
         private ISpawnPositionStrategy _spawnPositionStrategy;
+        private CancellationTokenSource _spawnCts;
 
         public float SpawnRateScale => _spawnScheduler?.SpawnRateScale ?? 1f;
         public float BattleDuration => _duration;
@@ -44,6 +46,7 @@ namespace SepCore.EnemyManager
             _entity = GameEntry.Entity;
             _enemyRegistry = new EnemyRegistry();
             _spawnScheduler = new EnemySpawnScheduler();
+            _spawnCts = CancellationTokenSource.CreateLinkedTokenSource(destroyCancellationToken);
 
             GameEntry.Event.Subscribe(HideEntityCompleteEventArgs.EventId, OnHideEntityComplete);
         }
@@ -52,6 +55,8 @@ namespace SepCore.EnemyManager
         {
             GameEntry.Event.Unsubscribe(HideEntityCompleteEventArgs.EventId, OnHideEntityComplete);
 
+            _spawnCts?.Dispose();
+            _spawnCts = null;
             _enemyRegistry = null;
             _spawnScheduler = null;
             _entity = null;
@@ -73,6 +78,7 @@ namespace SepCore.EnemyManager
 
         public void OnUpdate(float elapseSeconds, float realElapseSeconds)
         {
+            _enemyRegistry.PruneInvalidEntries();
             var spawnRequests = _spawnScheduler.Tick(elapseSeconds);
             foreach (var request in spawnRequests)
             {
@@ -85,6 +91,10 @@ namespace SepCore.EnemyManager
 
         public void OnReset()
         {
+            _spawnCts.Cancel();
+            _spawnCts.Dispose();
+            _spawnCts = CancellationTokenSource.CreateLinkedTokenSource(destroyCancellationToken);
+
             _spawnScheduler.Reset();
             ClearEnemies();
             _currentSpawnEnemyId = 0;
@@ -100,14 +110,20 @@ namespace SepCore.EnemyManager
             if (_player == null) return;
 
             if (_enemyRegistry.Count >= _spawnEnemyMaxCount) return;
-            int entityPoolId = _currentSpawnEnemyId % _spawnEnemyMaxCount;
-            var enemyData = EntityDataFactory.Create(entityPoolId, enemyType, _currentLevel);
+            int entityId = _currentSpawnEnemyId++;
+            var enemyData = EntityDataFactory.Create(entityId, enemyType, _currentLevel);
             enemyData.Position = _spawnPositionStrategy.GetSpawnPosition(_player);
-            _currentSpawnEnemyId++;
 
-            EnemyBase enemy = await _entity.ShowEnemyAsync(enemyData);
-            if (enemy == null)
+            var ct = _spawnCts.Token;
+            var (isCanceled, enemy) =
+                await _entity.ShowEnemyAsync(enemyData, cancellationToken: ct).SuppressCancellationThrow();
+            if (isCanceled || ct.IsCancellationRequested || enemy == null || !enemy.Available)
             {
+                if (enemy != null && enemy.Available)
+                {
+                    _entity.HideEntity(enemy);
+                }
+
                 return;
             }
 
@@ -115,12 +131,14 @@ namespace SepCore.EnemyManager
             {
                 enemy.SetTarget(_player);
             }
+
             _enemyRegistry.Register(enemy);
         }
 
-        public void ClearEnemies()
+        private void ClearEnemies()
         {
-            foreach (var enemy in _enemyRegistry.Enemies)
+            var enemies = new List<EntityBase>(_enemyRegistry.Enemies);
+            foreach (var enemy in enemies)
             {
                 if (enemy == null || !enemy.Available) continue;
                 _entity.HideEntity(enemy);