fix(interaction): 收藏计数同步维护并新增评论数接口

sql/backfill_favorite_count.sql

@@ -0,0 +1,10 @@
+-- Author: fruit.com.cn
+-- K85：按有效收藏关系回填短剧收藏数，仅由验收/运维手动执行一次。
+
+UPDATE drama d
+SET favorite_count = (
+    SELECT COUNT(*)
+    FROM user_favorite f
+    WHERE f.drama_id = d.id
+      AND f.deleted = 0
+);