完成动态删除功能

src/main/java/com/bao/dating/service/impl/PostServiceImpl.java

@@ -92,4 +92,15 @@ public class PostServiceImpl implements PostService {
         postMapper.insert(post);
         return post;
     }
+
+    /**
+     * 删除动态
+     *
+     * @param postId 动态ID
+     * @return 删除的动态对象
+     */
+    @Override
+    public void deletePostById(Integer postId) {
+        postMapper.deletePostById(postId);
+    }
 }