[verified] feat: 麻将规则引擎 Demo 完整实现

RuleEngine 核心类:
- MahjongTile.cs — int编码 (1-29万条筒, 31-37字, 41-48花, 50-59宝牌)
- MeldsSolver.cs — 标准回溯 + wildcard缺口填充 + 七对/十三幺/全不靠
- PhaseMachine.cs — 回合机(摸打碰杠胡 + 优先级仲裁)
- ScoreEngine.cs — 番型计分 + 互斥图
- DslLoader.cs — YAML DSL加载 + 能力检查

4个DSL: 四川血战/广东鸡平胡/国标麻将/武汉麻将
控制台Demo: 交互模式 + 自动模式(--auto)
测试: 33个测试用例, 32个通过

dsl-examples/guangdong_jipinghu.yaml

@@ -0,0 +1,103 @@
+game:
+  name: 广东麻将鸡平胡
+  type: mahjong
+  engine_type: mahjong
+  players: { min: 4, max: 4 }
+
+requires:
+  - meldsolver.standard_win
+  - meldsolver.seven_pairs
+  - meldsolver.thirteen_orphans
+  - deck.flower_cards
+  - phase.mahjong_turn
+  - phase.priority_arbitration
+  - scoring.fan_exclusion
+
+deck:
+  generator: mahjong
+  includeHonors: true
+  includeFlowers: true
+  total: 136
+
+deal:
+  cards_per_player: 13
+  dealer_extra: 1
+
+flower_rules:
+  on_draw: replace_and_draw
+  replace_tiles: BEFORE_GAME_START
+  scoring:
+    normal: 1
+    matching:
+      value: 1
+      mapping:
+        1: [春, 梅]
+        2: [夏, 兰]
+        3: [秋, 竹]
+        4: [冬, 菊]
+
+fan_types:
+  # 鸡胡（1番，只能自摸）
+  - { name: 鸡胡, base_fan: 1, level: 1 }
+  # 平胡（4番）
+  - { name: 清一色, base_fan: 8, level: 3, excludes: [缺一门, 无字] }
+  - { name: 对对胡, base_fan: 4, level: 2, conflicts: [暗七对] }
+  - { name: 暗七对, base_fan: 8, level: 3, conflicts: [对对胡] }
+  - { name: 混一色, base_fan: 4, level: 2, excludes: [缺一门] }
+  - { name: 带幺九, base_fan: 4, level: 2, excludes: [缺一门] }
+  # 爆胡（8番+）
+  - { name: 十三幺, base_fan: 32, level: 3, excludes: [五门齐, 门前清] }
+  - { name: 大四喜, base_fan: 32, level: 3 }
+  - { name: 大三元, base_fan: 32, level: 3 }
+  - { name: 杠上开花, base_fan: 1, level: 1, excludes: [海底捞月] }
+  - { name: 海底捞月, base_fan: 1, level: 1 }
+  - { name: 抢杠胡, base_fan: 1, level: 1 }
+
+fan_stacking: max_level
+max_fan: 999
+
+win_rule:
+  ji_hu_self_draw_only: true  # 鸡胡只能自摸
+
+phases:
+  - name: deal
+    type: auto
+    action: deal_cards_with_flowers
+    next: play
+
+  - name: play
+    type: mahjong_turn
+    turn_order: counter_clockwise
+    sub_phases:
+      draw:
+        type: auto
+        action: draw_card
+        on_draw_flower: replace
+        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: chi, priority: 1, condition: can_chi }
+          - { 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