feat: 实现 StoryItemService 业务逻辑

1. 在 StoryItemServiceImpl 中实现了分页查询、创建、更新、删除及详情获取等核心业务逻辑。
2. 重构了 StoryItem 实体类，将 time 字段更名为 storyItemTime。
3. 让 StoryItemVo 继承 StoryItem 以减少代码冗余，并支持更丰富的查询参数。
4. 引入了事务管理和分页插件支持。

timeline-story-service/src/main/java/com/timeline/story/entity/StoryItem.java

@@ -10,7 +10,7 @@ public class StoryItem {
     private String instanceId;
     private String storyInstanceId;
     private String content;
-    private LocalDateTime time;
+    private LocalDateTime storyItemTime;
     private String type;
     private String status;
     private String cover;

timeline-story-service/src/main/java/com/timeline/story/service/impl/StoryItemServiceImpl.java

@@ -1,74 +1,110 @@
 package com.timeline.story.service.impl;
 
+import com.github.pagehelper.PageHelper;
+import com.github.pagehelper.PageInfo;
+import com.timeline.common.utils.IdUtils;
+import com.timeline.common.utils.UserContextUtils;
+import com.timeline.story.dao.StoryItemMapper;
 import com.timeline.story.entity.StoryItem;
 import com.timeline.story.service.StoryItemService;
 import com.timeline.story.vo.StoryItemAddVo;
 import com.timeline.story.vo.StoryItemShareVo;
 import com.timeline.story.vo.StoryItemVo;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.time.LocalDateTime;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+@Slf4j
 @Service
 public class StoryItemServiceImpl implements StoryItemService {
+
+    @Autowired
+    private StoryItemMapper storyItemMapper;
+
     @Override
     public Map<String, Object> getItemsByMasterItem(StoryItemVo storyItemVo) {
-        // TODO: Implement this method
+        PageHelper.startPage(storyItemVo.getCurrent() != null ? storyItemVo.getCurrent() : 1,
+                storyItemVo.getPageSize() != null ? storyItemVo.getPageSize() : 10);
+        Map<String, Object> params = new HashMap<>();
+        params.put("storyInstanceId", storyItemVo.getStoryInstanceId());
+
+        List<StoryItem> list = storyItemMapper.selectStoryItemByStoryInstanceId(params);
+        PageInfo<StoryItem> pageInfo = new PageInfo<>(list);
+
         Map<String, Object> result = new HashMap<>();
-        result.put("list", Collections.emptyList());
-        result.put("total", 0);
+        result.put("list", pageInfo.getList());
+        result.put("total", pageInfo.getTotal());
         return result;
     }
 
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public void createStoryItem(StoryItemAddVo storyItemAddVo, List<MultipartFile> images) {
-        // TODO: Implement this method
+        storyItemAddVo.setInstanceId(IdUtils.randomUuid());
+        storyItemAddVo.setCreateId(UserContextUtils.getCurrentUserId());
+        storyItemAddVo.setCreateTime(LocalDateTime.now());
+        storyItemAddVo.setUpdateTime(LocalDateTime.now());
+        storyItemAddVo.setIsDelete(0);
+        if (storyItemAddVo.getStoryItemTime() == null) {
+            storyItemAddVo.setStoryItemTime(LocalDateTime.now());
+        }
+
+        storyItemMapper.insert(storyItemAddVo);
+        // Images handling to be implemented
     }
 
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public void updateItem(StoryItemAddVo storyItemAddVo, List<MultipartFile> images) {
-        // TODO: Implement this method
+        storyItemAddVo.setUpdateId(UserContextUtils.getCurrentUserId());
+        storyItemAddVo.setUpdateTime(LocalDateTime.now());
+        storyItemMapper.update(storyItemAddVo);
+        // Images handling to be implemented
     }
 
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public void deleteItem(String itemId) {
-        // TODO: Implement this method
+        storyItemMapper.deleteByItemId(itemId);
     }
 
     @Override
     public StoryItem getItemById(String itemId) {
-        // TODO: Implement this method
-        return null;
+        return storyItemMapper.selectById(itemId);
     }
 
     @Override
     public List<String> getStoryItemImages(String itemId) {
-        // TODO: Implement this method
-        return Collections.emptyList();
+        return storyItemMapper.selectImagesByItemId(itemId);
     }
 
     @Override
     public Integer getStoryItemCount(String storyInstanceId) {
-        // TODO: Implement this method
-        return 0;
+        return storyItemMapper.countByStoryId(storyInstanceId);
     }
 
     @Override
     public StoryItemShareVo getItemByShareId(String shareId) {
-        // TODO: Implement this method
-        return null;
+        return storyItemMapper.selectByShareIdWithAuthor(shareId);
     }
 
     @Override
     public Map<String, Object> searchItems(String keyword, Integer pageNum, Integer pageSize) {
-        // TODO: Implement this method
+        PageHelper.startPage(pageNum, pageSize);
+        List<StoryItemVo> list = storyItemMapper.searchItems(keyword);
+        PageInfo<StoryItemVo> pageInfo = new PageInfo<>(list);
+
         Map<String, Object> result = new HashMap<>();
-        result.put("list", Collections.emptyList());
-        result.put("total", 0);
+        result.put("list", pageInfo.getList());
+        result.put("total", pageInfo.getTotal());
         return result;
     }
 }

timeline-story-service/src/main/java/com/timeline/story/vo/StoryItemVo.java

@@ -1,10 +1,12 @@
 package com.timeline.story.vo;
 
+import com.timeline.story.entity.StoryItem;
 import lombok.Data;
+import lombok.EqualsAndHashCode;
 
 @Data
-public class StoryItemVo {
-    private String storyInstanceId;
+@EqualsAndHashCode(callSuper = true)
+public class StoryItemVo extends StoryItem {
     private Integer current;
     private Integer pageSize;
 }