fix: 番型互斥从未应用 + FanValue兜底乱给分 + 白名单过滤

Root cause:
1. ApplyFanExclusions定义但从未被调用 → 互斥(清一色⊃缺一门)形同虚设
2. FanValue中 _=>1 兜底 → '缺一门''平胡'等不在DSL的番型也被+1分
3. IdentifyFans返回所有结构模式 → 与DSL配置不一致

修复:
- CheckWin五处IdentifyFans调用后加ApplyFanExclusions
- FanValue去掉_=>1,改为只认DSL配置+硬编码知名番型
- IdentifyFans末尾白名单过滤:只返回DSL或知名番型
- PhaseMachine.GetFanValue同步更新
- ScoreEngine: 不在DSL的番型→0分

RuleEngine/Scoring/ScoreEngine.cs

@@ -84,15 +84,17 @@ public class MahjongScoreEngine
     {
         if (_fanConfig.TryGetValue(fan, out var def))
             return def.BaseFan;
-        // Fallback for fan names not in config
+        // Hardcoded values for well-known fans not in every DSL
         return fan switch
         {
-            "清一色" => 4,
+            "清一色" => 24,
+            "混一色" => 6,
             "对对胡" => 2,
-            "暗七对" => 4,
+            "暗七对" => 8,
+            "七对" => 8,
             "带幺九" => 2,
             "十三幺" => 88,
-            _ => 1
+            _ => 0
         };
     }
 }