fix(interaction): 收藏计数同步维护并新增评论数接口

fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java

@@ -260,6 +260,18 @@ public class DramaService {
                         : "like_count = GREATEST(like_count - 1, 0)"));
     }
 
+    /** 收藏数原子增减：并发下用 SQL 自增，不做读改写，避免丢更新。 */
+    public void adjustFavoriteCount(Long dramaId, int delta) {
+        if (dramaId == null || delta == 0) {
+            return;
+        }
+        dramaMapper.update(null, Wrappers.<Drama>lambdaUpdate()
+                .eq(Drama::getId, dramaId)
+                .setSql(delta > 0
+                        ? "favorite_count = favorite_count + 1"
+                        : "favorite_count = GREATEST(favorite_count - 1, 0)"));
+    }
+
     /** 剧集数量变化后同步冗余字段。 */
     public void syncTotalEpisodes(Long dramaId) {
         Long count = dramaEpisodeMapper.selectCount(