fix: 子代理审查26问题修复13个(剩余为编码定义/DSL文档字段)

本次修复(13/26):
- FuFlag传播: PhaseConfig加FuFlag属性+BuildPhases映射
- Excludes/Conflicts引用完整性: 引用的番型名必须存在于fan_types
- WildcardBase常量提取: WildcardRegistry引用MahjongTile.WildcardBase
- 合规验证扩展: max_fan/phase.type/end_condition/action/priority
- FanCalculationPolicy未消费警告

不修复的剩余13个:
- 编码常量(MahjongTile domain定义,非配置项)
- DSL字段仅文档(POCO有但引擎硬编码等效逻辑)
- LOW代码卫生项

--check输出现在会报告: excludes/conflicts引用了不存在的番型(如国标15个)

RuleEngine/Core/WildcardRegistry.cs

@@ -20,8 +20,8 @@ public class WildcardRegistry
     /// <summary>The tile revealed from deck to determine random wildcards (骰子翻牌定精).</summary>
     public int? RevealedTile { get; set; }
 
-    public WildcardRegistry() { _wildcardBase = 50; }
-    public WildcardRegistry(int wildcardBase) { _wildcardBase = wildcardBase > 0 ? wildcardBase : 50; }
+    public WildcardRegistry() { _wildcardBase = MahjongTile.WildcardBase; }
+    public WildcardRegistry(int wildcardBase) { _wildcardBase = wildcardBase > 0 ? wildcardBase : MahjongTile.WildcardBase; }
 
     /// <summary>Non-extra wildcard tiles — normal tiles (e.g. 红中=35) that ALSO act as wildcards.</summary>
     public IReadOnlySet<int> ConfiguredWildcards => _wildcards;