refactor(scheduler): add base context for graceful shutdown

- Create application-level context with cancel function
- Pass base context to scheduler via WithBaseContext option
- Move scheduler.Stop() to explicit shutdown sequence after context cancellation
- Upgrade foundation dependency to v0.7.0 for new scheduler options

cmd/server/main.go

@@ -85,6 +85,8 @@ func main() {
 	}
 
 	logger, _ := logging.New(logging.Options{Service: "ez-api"})
+	appCtx, appCancel := context.WithCancel(context.Background())
+	defer appCancel()
 	if len(os.Args) > 1 && os.Args[1] == "import" {
 		code := runImport(logger, os.Args[2:])
 		os.Exit(code)
@@ -201,7 +203,11 @@ func main() {
 	alertDetector := cron.NewAlertDetector(db, logDB, rdb, service.NewStatsService(rdb), alertDetectorConfig, logger)
 
 	// Setup scheduler (jobs are added incrementally, Start() called after all services initialized)
-	sched := scheduler.New(scheduler.WithLogger(logger), scheduler.WithSkipIfRunning())
+	sched := scheduler.New(
+		scheduler.WithLogger(logger),
+		scheduler.WithSkipIfRunning(),
+		scheduler.WithBaseContext(appCtx),
+	)
 	sched.Every("quota-reset", time.Duration(cfg.Quota.ResetIntervalSeconds)*time.Second, quotaResetter.RunOnce)
 	sched.Every("log-cleanup", time.Hour, logCleaner.RunOnce)
 	sched.Every("token-refresh", time.Duration(cfg.TokenRefresh.IntervalSeconds)*time.Second, tokenRefresher.RunOnce)
@@ -209,7 +215,6 @@ func main() {
 	if outboxService != nil && outboxService.Enabled() {
 		sched.Every("sync-outbox", outboxService.Interval(), outboxService.RunOnce)
 	}
-	defer sched.Stop()
 
 	adminService, err := service.NewAdminService()
 	if err != nil {
@@ -430,6 +435,8 @@ func main() {
 	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
 	<-quit
 	logger.Info("shutting down server...")
+	appCancel()
+	sched.Stop()
 
 	// Shutdown with timeout
 	ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)