fix(migrate): use Statement::from_string in down method for SeaORM 2.0

libs/migrate/m20260420_000003_add_model_id_to_room_message.rs

@@ -20,10 +20,10 @@ impl MigrationTrait for Migration {
     async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
         manager
             .get_connection()
-            .execute_raw(
+            .execute_raw(sea_orm::Statement::from_string(
                 sea_orm::DbBackend::Postgres,
                 "ALTER TABLE room_message DROP COLUMN IF EXISTS model_id;",
-            )
+            ))
             .await?;
         Ok(())
     }