feat(计分): 实现血战计分V1核心逻辑

- 新增血战计分服务，支持七对、清一色等基础番型及杠上花等特殊加番
- 扩展结算结果结构，包含番型明细与支付分数计算
- 新增PostGangContext记录杠后补摸窗口，用于判断杠上花/杠上炮
- 完善胡牌判定器，新增七对和对对胡识别方法
- 更新开发计划文档，补充注释规范要求
- 添加计分相关单元测试，确保核心逻辑正确性

backend/src/test/java/com/xuezhanmaster/game/event/GameEventTest.java

@@ -2,6 +2,8 @@ package com.xuezhanmaster.game.event;
 
 import com.xuezhanmaster.game.domain.ActionType;
 import com.xuezhanmaster.game.domain.ScoreChange;
+import com.xuezhanmaster.game.domain.SettlementDetail;
+import com.xuezhanmaster.game.domain.SettlementFan;
 import com.xuezhanmaster.game.domain.SettlementResult;
 import com.xuezhanmaster.game.domain.SettlementType;
 import org.junit.jupiter.api.Test;
@@ -54,6 +56,12 @@ class GameEventTest {
                 2,
                 0,
                 "9筒",
+                new SettlementDetail(
+                        1,
+                        2,
+                        4,
+                        List.of(new SettlementFan("QING_YI_SE", "清一色", 2))
+                ),
                 List.of(
                         new ScoreChange(2, 1, 3),
                         new ScoreChange(0, -1, -2)
@@ -69,7 +77,12 @@ class GameEventTest {
                 .containsEntry("actionType", "HU")
                 .containsEntry("sourceSeatNo", 0)
                 .containsEntry("triggerTile", "9筒");
+        assertThat(settlementApplied.payload()).containsKey("settlementDetail");
         assertThat(settlementApplied.payload()).containsKey("scoreChanges");
+        assertThat((java.util.Map<String, Object>) settlementApplied.payload().get("settlementDetail"))
+                .containsEntry("baseScore", 1)
+                .containsEntry("totalFan", 2)
+                .containsEntry("paymentScore", 4);
 
         assertThat(scoreChanged.eventType()).isEqualTo(GameEventType.SCORE_CHANGED);
         assertThat(scoreChanged.payload())