feat(interaction): 新增分集计数统计接口

fruitshorts-module-interaction/src/main/java/com/fruitshorts/interaction/service/LikeService.java

@@ -18,7 +18,10 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Collection;
+import java.util.HashSet;
 import java.util.Locale;
+import java.util.Set;
 
 /**
  * 点赞。关系表是事实来源，计数同步更新在目标行上。
@@ -86,6 +89,29 @@ public class LikeService {
         return comment == null || comment.getLikeCount() == null ? 0L : comment.getLikeCount();
     }
 
+    /** 批量判断用户是否已点赞，一次查询覆盖多个目标。 */
+    public Set<Long> likedTargetIds(Long userId, String type, Collection<Long> targetIds) {
+        if (userId == null || targetIds == null || targetIds.isEmpty()) {
+            return Set.of();
+        }
+        Set<Long> normalized = new HashSet<>();
+        for (Long targetId : targetIds) {
+            if (targetId != null) {
+                normalized.add(targetId);
+            }
+        }
+        if (normalized.isEmpty()) {
+            return Set.of();
+        }
+        return likeMapper.selectList(Wrappers.<ContentLike>lambdaQuery()
+                        .eq(ContentLike::getUserId, userId)
+                        .eq(ContentLike::getTargetType, type)
+                        .in(ContentLike::getTargetId, normalized))
+                .stream()
+                .map(ContentLike::getTargetId)
+                .collect(java.util.stream.Collectors.toSet());
+    }
+
     private void adjustCount(String type, Long targetId, int delta) {
         if (TYPE_DRAMA.equals(type)) {
             dramaService.adjustLikeCount(targetId, delta);