refactor(sync): drop favorite-folder tracking and deal

reaction_board/migrations.py

@@ -207,6 +207,15 @@ MIGRATIONS: tuple[Migration, ...] = (
             """,
         ),
     ),
+    Migration(
+        version=5,
+        name="stop favorite-folder tracking",
+        statements=(
+            # 不再追踪收藏夹后，“取消收藏”状态失去语义；历史 unfaved 行归一到 active。
+            # 表结构与历史数据保留，仅停止写入。
+            "UPDATE video SET status = 'active' WHERE status = 'unfaved'",
+        ),
+    ),
 )