feat: EndConditions映射 + 骰子翻牌定精(random wildcard)

EndConditions:
- BuildPhases 现在映射 PhaseConfig.Endconditions (之前 DslLoader 解析但 BuildPhases 忽略)
- 4处 _rules.Phases.Any(p => p.ParallelElimination) → _playPhase.ParallelElimination
- 新增 _playPhase 字段, 游戏不再依赖原始 DSL 做运行时判断

Random wildcard (骰子翻牌定精):
- WildcardRegistry.ComputeNextTiles(): 翻到 X → 正精=X+1, 副精=X+2 (9→1 循环, 字牌序循环)
- WildcardRegistry.RevealedTile 记录翻到的牌
- Deal() 发牌后翻一张牌确定精, 支持 random_count 控制精数量
- WildcardConfig 新增 RandomCount 字段 (默认2=正精+副精)
- ValidateRuleCompliance 接受 random 类型

南昌麻将 DSL:
- 新增 dsl-examples/nanchang.yaml (136张, random精, 无吃)
- 引擎加载 7/7, 1000局 0错误, 胡牌率 61%

58 tests pass, 5 种玩法全部 0 错误验证通过

dsl-examples/nanchang.yaml

@@ -0,0 +1,100 @@
+game:
+  name: 南昌麻将
+  type: mahjong
+  engine_type: mahjong
+  players: { min: 4, max: 4 }
+
+requires:
+  - deck.generator_mahjong
+  - meldsolver.standard_win
+  - meldsolver.seven_pairs
+  - meldsolver.wildcard
+  - phase.mahjong_turn
+  - phase.priority_arbitration
+  - scoring.fan_exclusion
+
+deck:
+  generator: mahjong
+  include_honors: true
+  include_flowers: false
+  total: 136
+
+deal:
+  cards_per_player: 13
+  dealer_extra: 1
+
+# 南昌麻将的精(癞子)系统：骰子翻牌定精
+# 翻到X，则X+1为正精，X+2为副精。字牌按序循环。
+wildcard_rules:
+  type: random
+  random_count: 2
+  wildcard_encoding: 50
+  behavior: substitute
+  fan_calculation_policy: optimal
+  scoring:
+    per_wildcard_in_win: 1
+
+fan_types:
+  # 基础番型
+  - { name: 清一色, base_fan: 4, excludes: [缺一门, 无字] }
+  - { name: 混一色, base_fan: 2, excludes: [缺一门] }
+  - { name: 对对胡, base_fan: 2 }
+  - { name: 暗七对, base_fan: 4 }
+  # 特殊牌型
+  - { name: 带幺九, base_fan: 2, excludes: [缺一门] }
+  - { name: 缺一门, base_fan: 0 }
+  - { name: 无字, base_fan: 0 }
+  # 事件番型
+  - { name: 杠上开花, base_fan: 1, excludes: [海底捞月] }
+  - { name: 海底捞月, base_fan: 1 }
+  - { name: 抢杠胡, base_fan: 1 }
+  - { name: 天胡, base_fan: 10 }
+  - { name: 地胡, base_fan: 5 }
+  # 癞子相关
+  - { name: 癞子胡, base_fan: 1, condition: hand_contains_wildcard }
+  # 兜底
+  - { name: 鸡胡, base_fan: 1 }
+
+fan_stacking: add
+max_fan: 999
+
+phases:
+  - name: deal
+    type: auto
+    action: deal_cards
+    next: play
+
+  - name: play
+    type: mahjong_turn
+    turn_order: counter_clockwise
+    sub_phases:
+      draw:
+        type: auto
+        action: draw_card
+        on_empty_deck: exhausted
+      self_action:
+        options:
+          - { action: discard }
+          - { action: an_kong }
+          - { action: bu_kong, condition: has_punged_pair }
+          - { action: win, condition: can_win_tumo }
+      others_reaction:
+        options:
+          - { action: pung, priority: 2, condition: has_two_same }
+          - { action: ming_kong, priority: 3, condition: has_three_same }
+          - { action: win, priority: 4, condition: can_win }
+          - { action: pass, priority: 0 }
+        priority_policy: highest_wins
+        on_win: game_over
+    end_conditions:
+      - { type: player_wins, action: settle }
+      - { type: deck_exhausted, action: draw_game }
+
+  - name: settle
+    type: auto
+    action: calculate_scores
+    next: null
+
+scoring:
+  mode: fan_table
+  max_cap: 999