feat: 集成测试 + 手动出牌模式 + discart pool幽灵牌修复

集成测试 (10个):
- 发牌: 庄14闲13, 牌墙55
- 回合流转: 庄家第一轮不摸牌, 非庄家摸牌后出牌
- 数据完整性: 10回合后手牌+副露+牌墙+弃牌=108
- 对局完整性: 4种DSL全部不出错完成
- 构造听牌: 完整手牌第一轮自摸

手动出牌 (--human):
- HumanMahjongPlayer: 显示手牌/可选操作/h=胡/p=碰/k=杠/1-N=出牌
- MahjongRoom: humanPlayer参数

修复: DiscardPool碰/胡后不移除→幽灵牌→总牌数溢出

RuleEngine/MahjongRoom.cs

@@ -13,17 +13,21 @@ public class MahjongRoom
     public bool IsFinished { get; private set; }
     private readonly MahjongDslRoot _rules;
     private readonly List<RandomMahjongAI> _ais;
+    private readonly HumanMahjongPlayer? _human;
     private readonly MeldsSolver _solver;
     private readonly MahjongPhaseMachine _phaseMachine;
     private readonly MahjongScoreEngine _scoreEngine;
     private readonly bool _autoMode;
     private readonly Random _rng = Random.Shared;
 
-    public MahjongRoom(MahjongDslRoot rules, string[] playerNames, bool autoMode = false)
+    public MahjongRoom(MahjongDslRoot rules, string[] playerNames, bool autoMode = false,
+        string? humanPlayer = null)
     {
         _rules = rules;
         _autoMode = autoMode;
         _ais = playerNames.Select((n, i) => new RandomMahjongAI(n, new Random(i * 7919))).ToList();
+        if (humanPlayer != null)
+            _human = new HumanMahjongPlayer(humanPlayer);
 
         var fanConfig = BuildFanConfig();
         _solver = new MeldsSolver(fanConfig);
@@ -179,7 +183,9 @@ public class MahjongRoom
         // Phase 3: Player decides what to do with their drawn hand
         bool requireWinFan = _rules.WinMinFan > 0;
         var legalActions = _phaseMachine.GetLegalActions(State, player, requireWinFan);
-        var (action, tile) = _ais.First(a => a.Name == player).Decide(legalActions, State);
+        var (action, tile) = _human != null && player == _human.Name
+            ? _human.Decide(legalActions, State)
+            : _ais.First(a => a.Name == player).Decide(legalActions, State);
 
         if (action == "win")
         {
@@ -285,6 +291,9 @@ public class MahjongRoom
 
         if (best.action == "win")
         {
+            // Remove the winning tile from pool (it's now part of the winning hand)
+            State.DiscardPool.Remove(discardTile);
+
             var handWithTile = new List<int>(State.Hands[bp]) { discardTile };
             var (wc2, r2582) = GetWinParams();
             int wildInHand2 = CountWildcardsInHand(handWithTile);
@@ -305,6 +314,9 @@ public class MahjongRoom
 
         if (best.action == "pung" || best.action == "ming_kong")
         {
+            // Remove the discarded tile from pool (it's now in the meld)
+            State.DiscardPool.Remove(discardTile);
+
             // Remove tiles from hand (pung: 2, ming_kong: 3)
             // The discard tile is taken from pool, not from hand
             int toRemove = best.action == "ming_kong" ? 3 : 2;