refactor: 删除未使用的代码和注释

- 移除了 CollectionServiceImpl 中的 @Autowired 注解- 删除了 NoteController 中的未使用注释
- 注释掉了 QuestionListItemServiceImpl 中的未使用变量和方法调用
- 移除了 UserServiceImpl 中的未使用变量

src/main/java/com/example/copykamanotes/controller/NoteController.java

@@ -89,7 +89,6 @@ public class NoteController {
 
     /**
      * 下载笔记
-     * @return
      */
     @GetMapping("/notes/download")
     public ApiResponse<DownloadNoteVO> downloadNote() {

src/main/java/com/example/copykamanotes/service/impl/CollectionServiceImpl.java

@@ -18,7 +18,6 @@ import com.example.copykamanotes.service.CollectionService;
 import com.example.copykamanotes.utils.ApiResponseUtils;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.BeanUtils;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 

src/main/java/com/example/copykamanotes/service/impl/QuestionListItemServiceImpl.java

@@ -33,10 +33,10 @@ import java.util.Set;
 public class QuestionListItemServiceImpl implements QuestionListItemService {
 
     private final QuestionListItemMapper questionListItemMapper;
-    private final QuestionListMapper questionListMapper;
+//    private final QuestionListMapper questionListMapper;
     private final RequestScopeData requestScopeData;
     private final NoteMapper noteMapper;
-    private final UserMapper userMapper;
+//    private final UserMapper userMapper;
 
     @Override
     public ApiResponse<List<QuestionListItemUserVO>> userGetQuestionListItems(QuestionListItemQueryParams questionListItemQueryParams) {
@@ -48,7 +48,7 @@ public class QuestionListItemServiceImpl implements QuestionListItemService {
 
         Integer questionListId = questionListItemQueryParams.getQuestionListId();
 
-        QuestionList questionList = questionListMapper.findById(questionListId);
+//        QuestionList questionList = questionListMapper.findById(questionListId);
 
         List<QuestionListItemVO> questionListItem = questionListItemMapper.findByQuestionListIdPage(questionListId, questionListItemQueryParams.getPageSize(), offset);
         List<Integer> questionIds = questionListItem.stream().map(item -> item.getQuestion().getQuestionId()).toList();

src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java

@@ -43,7 +43,6 @@ public class UserServiceImpl implements UserService {
     private final JwtUtil jwtUtil;
     private final RequestScopeData requestScopeData;
     private final FileService fileService;
-    private final EmailService emailService;
 
     @Override
     @Transactional(rollbackFor = Exception.class)
@@ -90,7 +89,7 @@ public class UserServiceImpl implements UserService {
 
     @Override
     public ApiResponse<LoginUserVO> login(LoginRequest loginRequest) {
-        User user = null;
+        User user;
 
         if (loginRequest.getAccount() != null && !loginRequest.getAccount().isEmpty()) {
             user = userMapper.findByAccount(loginRequest.getAccount());