优化结构

internal/service/system/email.go

@@ -14,7 +14,3 @@ func (s *EmailService) Test(ctx context.Context) error { return s.uc.Test(ctx) }
 func (s *EmailService) Send(ctx context.Context, to, subject, body string) error {
 	return s.uc.Send(ctx, to, subject, body)
 }
-
-func (s *EmailService) Alert(ctx context.Context, subject, body string) error {
-	return s.uc.Alert(ctx, subject, body)
-}