feat(user): 新增邮箱注册与验证码发送功能

- 新增 UserRegisterDTO 及 /user/register 接口
- 集成 MailerSend，异步发送 6 位验证码邮件
- 添加 RedisUtil 缓存验证码 10 分钟
- 补充 SEND_MAIL_FAILED、CONFIRM_PASSWORD_NOT_MATCH 错误码
- 关闭 Spring Security CSRF 与表单登录，放行 /user/register
- AppleService 移除 @AllArgsConstructor，改用 @Resource 注入

src/main/java/com/yolo/keyborad/mapper/KeyboardUserCharacterMapper.java

@@ -2,6 +2,10 @@ package com.yolo.keyborad.mapper;
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.yolo.keyborad.model.entity.KeyboardUserCharacter;
+import com.yolo.keyborad.model.vo.character.KeyboardUserCharacterVO;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
 
 /*
 * @author: ziin
@@ -9,4 +13,9 @@ import com.yolo.keyborad.model.entity.KeyboardUserCharacter;
 */
     
 public interface KeyboardUserCharacterMapper extends BaseMapper<KeyboardUserCharacter> {
+
+    List<KeyboardUserCharacterVO> selectByUserId(@Param("loginId") long loginId);
+
+    void updateSortByIdAndUserId(@Param("sort") Integer[] sort,@Param("userId") long userId);
+
 }