add set scheduling api

backend/app/Schedule/UseCases/ListSchedules/ListSchedules.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Schedule\UseCases\ListSchedules;
+
+use App\Schedule\Schedule;
+use App\Schedule\ScheduleRepository;
+use App\User\User;
+
+class ListSchedules
+{
+    public function __construct(
+        private ScheduleRepository $scheduleRepository,
+    ) {}
+
+    /**
+     * @return list<Schedule>
+     */
+    public function execute(User $user): array
+    {
+        return $this->scheduleRepository->findAllForUser($user);
+    }
+}