details improvement and unnecessary files deletion

internal/scheduler/certificate.go

@@ -0,0 +1,11 @@
+package scheduler
+
+import "context"
+
+type CertificateService interface {
+	InitSchedule(ctx context.Context) error
+}
+
+func NewCertificateScheduler(service CertificateService) error {
+	return service.InitSchedule(context.Background())
+}