fix: resolve invalid multi-catch hierarchy

src/main/java/com/test/demo/service/impl/AuthServiceImpl.java

@@ -23,7 +23,6 @@ import com.test.demo.vo.LoginVo;
 import com.test.demo.vo.UserVo;
 import lombok.RequiredArgsConstructor;
 import org.springframework.dao.DataIntegrityViolationException;
-import org.springframework.dao.DuplicateKeyException;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Service;
 
@@ -109,7 +108,7 @@ public class AuthServiceImpl implements AuthService {
         user.setStatus(UserStatusEnum.NORMAL);
         try {
             userService.save(user);
-        } catch (DuplicateKeyException | DataIntegrityViolationException ex) {
+        } catch (DataIntegrityViolationException ex) {
             throw new BizException(ResultCode.CONFLICT, "用户名已存在");
         }
     }

src/main/java/com/test/demo/service/impl/UserServiceImpl.java

@@ -22,7 +22,6 @@ import com.test.demo.vo.UserVo;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
 import org.springframework.dao.DataIntegrityViolationException;
-import org.springframework.dao.DuplicateKeyException;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
@@ -73,7 +72,7 @@ public class UserServiceImpl extends ServiceImpl<UserMapper, UserEntity> impleme
         entity.setStatus(UserStatusEnum.NORMAL);
         try {
             save(entity);
-        } catch (DuplicateKeyException | DataIntegrityViolationException ex) {
+        } catch (DataIntegrityViolationException ex) {
             throw new BizException(ResultCode.CONFLICT, "用户名已存在");
         }
     }
@@ -155,7 +154,7 @@ public class UserServiceImpl extends ServiceImpl<UserMapper, UserEntity> impleme
                 entity.setStatus(UserStatusEnum.NORMAL);
                 try {
                     save(entity);
-                } catch (DuplicateKeyException | DataIntegrityViolationException ex) {
+                } catch (DataIntegrityViolationException ex) {
                     throw new BizException(ResultCode.CONFLICT, "导入失败，用户名已存在: " + row.getUsername());
                 }
             }