feat: 消费金币时保存消费记录

- UserInfoService.consumeCoins方法添加消费记录保存
- 记录包含：用户ID、消费金额、消费类型、描述、关联ID
- 消费详情页面可查看每次测算的金币消耗记录

src/main/java/xuan/service/UserInfoService.java

@@ -4,7 +4,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import xuan.entity.UserInfo;
+import xuan.entity.CoinConsumeRecord;
 import xuan.repository.UserInfoRepository;
+import xuan.repository.CoinConsumeRecordRepository;
 
 import java.util.Random;
 
@@ -17,6 +19,9 @@ public class UserInfoService {
     @Autowired
     private DeductRecordService deductRecordService;
     
+    @Autowired
+    private CoinConsumeRecordRepository coinConsumeRecordRepository;
+    
     public UserInfo loginOrRegister(String openId, String nickname, String avatarUrl) {
         UserInfo user = userInfoRepository.findByOpenId(openId);
         if (user != null) {
@@ -134,7 +139,17 @@ public class UserInfoService {
                 return null;
             }
             user.setCoins(user.getCoins() - amount);
-            return userInfoRepository.save(user);
+            userInfoRepository.save(user);
+            
+            CoinConsumeRecord record = new CoinConsumeRecord();
+            record.setUserId(userId);
+            record.setAmount(amount);
+            record.setType(type);
+            record.setDescription(description);
+            record.setRelatedId(relatedId);
+            coinConsumeRecordRepository.save(record);
+            
+            return user;
         }
         return null;
     }