feat: 添加数据库支持，保存测算记录

- 添加Spring Data JPA和H2/MySQL数据库依赖
- 创建DeductRecord实体类，保存测算记录
- 创建DeductRecordRepository和DeductRecordService
- 创建RecordController，提供记录查询和删除API
- 修改BaZiController，保存测算结果到数据库
- 配置H2数据库用于开发，MySQL用于生产环境

src/main/java/xuan/repository/DeductRecordRepository.java

@@ -0,0 +1,20 @@
+package xuan.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+import xuan.entity.DeductRecord;
+
+import java.util.List;
+
+@Repository
+public interface DeductRecordRepository extends JpaRepository<DeductRecord, Long> {
+    
+    List<DeductRecord> findByUserIdOrderByCreateTimeDesc(String userId);
+    
+    List<DeductRecord> findByUserIdAndTypeOrderByCreateTimeDesc(String userId, String type);
+    
+    @Query("SELECT d FROM DeductRecord d WHERE d.userId = :userId ORDER BY d.createTime DESC LIMIT 10")
+    List<DeductRecord> findTop10ByUserIdOrderByCreateTimeDesc(@Param("userId") String userId);
+}