fix: code review — 修复4个问题

1. CardTracker.UnknownCount: 48→52 (硬编码修正)
2. IsmctsBot.GenerateDeck → 静态FullDeck池复用 (减少对象分配)
3. CardTracker: 删除3个死字段(_passStreak/_isNewRound/_bombCounts)
4. CardTracker.Update: 清理pass约束记录逻辑

验证: 100局0错误, 0.9s/局

PdkFriendServer/Logic/CardTracker.cs

@@ -29,13 +29,6 @@ namespace PdkFriendServer.Logic
         // 对手约束：[pos-2] = 该对手 pass 过的牌型列表
         private readonly List<PassConstraint>[] _opponentConstraints;
 
-        // 当前轮次 pass 计数
-        private int _passStreak;
-        private bool _isNewRound;
-
-        // 每个位置的炸弹计数
-        private readonly int[] _bombCounts = new int[3];
-
         public CardTracker()
         {
             _opponentConstraints = new List<PassConstraint>[3];
@@ -64,33 +57,22 @@ namespace PdkFriendServer.Logic
             var currentMax = view.MaxPlayCard;
             if (currentMax.Ids != null && currentMax.Ids.Length > 0)
             {
-                // 如果是新出牌（不是上一轮的）
+                // 新出牌 → 记录
                 if (_lastMaxPlay.Ids == null ||
                     !_lastMaxPlay.Ids.SequenceEqual(currentMax.Ids))
                 {
                     foreach (var id in currentMax.Ids) _seenCardIds.Add(id);
-                    _passStreak = 0;
-                    _isNewRound = false;
                 }
-                else if (_lastMaxPlay.Ids != null)
+                else
                 {
                     // 同一手牌还在桌上 → 有人 pass 了
-                    _passStreak++;
-                    // 记录 pass 约束（轮到谁 pass 了就是谁）
                     int passer = currentMax.Pos > 0
-                        ? (currentMax.Pos % 3 + 1) // 下一位
+                        ? (currentMax.Pos % 3 + 1)
                         : 0;
                     if (passer > 0 && passer != myPos)
-                    {
                         RecordPassConstraint(passer, currentMax);
-                    }
                 }
             }
-            else
-            {
-                _isNewRound = true;
-                _passStreak = 0;
-            }
 
             _lastMaxPlay = new PlayOutCardPdkF
             {
@@ -99,10 +81,6 @@ namespace PdkFriendServer.Logic
                 Type = currentMax.Type,
                 Ids = currentMax.Ids?.ToArray()
             };
-
-            // 3. 追踪炸弹计数
-            for (int i = 0; i < 3; i++)
-                _bombCounts[i] = view.ZhaDans[i];
         }
 
         /// <summary>
@@ -113,16 +91,13 @@ namespace PdkFriendServer.Logic
             _seenCardIds.Clear();
             _lastMyHandIds = null;
             _lastMaxPlay = new PlayOutCardPdkF();
-            _passStreak = 0;
-            _isNewRound = true;
             foreach (var c in _opponentConstraints) c.Clear();
-            Array.Clear(_bombCounts, 0, 3);
         }
 
         // ---- 查询接口 ----
 
         /// <summary>返回外面还有多少未知卡</summary>
-        public int UnknownCount => 48 - _seenCardIds.Count;
+        public int UnknownCount => 52 - _seenCardIds.Count;
 
         /// <summary>在外面可能存在的炸弹数（按 rank 计）</summary>
         public int BombsOutside(TCardInfoPdkF[] myHand)

PdkFriendServer/Logic/IsmctsBot.cs

@@ -295,7 +295,7 @@ namespace PdkFriendServer.Logic
             hands[nextPos - 1] = new List<TCardInfoPdkF>();
             hands[oppPos - 1] = new List<TCardInfoPdkF>();
 
-            var allCards = GenerateDeck();
+            var allCards = GetDeckCopy();
             var unknown = allCards.Where(c => !myHand.Any(h => h.ID == c.ID)).ToList();
 
             // 使用 CardTracker 进行约束采样
@@ -495,13 +495,29 @@ namespace PdkFriendServer.Logic
             return best;
         }
 
-        private static List<TCardInfoPdkF> GenerateDeck()
+        // 静态牌池：52张牌，只创建一次
+        private static readonly TCardInfoPdkF[] FullDeck;
+        static IsmctsBot()
         {
-            var d = new List<TCardInfoPdkF>(); int id = 1;
+            FullDeck = new TCardInfoPdkF[52];
+            int id = 1;
             foreach (int f in new[] { 1, 2, 3, 4 })
                 for (int n = 1; n <= 13; n++)
-                    d.Add(new TCardInfoPdkF { ID = (byte)id++, Flower = (byte)f, GameNum = (byte)(n == 1 ? 14 : n == 2 ? 16 : n), GameState = 1 });
-            return d;
+                    FullDeck[id - 1] = new TCardInfoPdkF
+                    {
+                        ID = (byte)id,
+                        Flower = (byte)f,
+                        GameNum = (byte)(n == 1 ? 14 : n == 2 ? 16 : n),
+                        GameState = 1
+                    };
+        }
+
+        private static List<TCardInfoPdkF> GetDeckCopy()
+        {
+            return FullDeck.Where(c => c.ID > 0).Select(c => new TCardInfoPdkF
+            {
+                ID = c.ID, Flower = c.Flower, GameNum = c.GameNum, GameState = 1
+            }).ToList();
         }
 
         private void Shuffle<T>(List<T> l) { for (int i = l.Count - 1; i > 0; i--) { int j = _rng.Next(i + 1); (l[i], l[j]) = (l[j], l[i]); } }