fix: resolve all quality gate failures — i18n key, typography tokens, PHPStan errors, style

- Add missing i18n key "LDAP attribute map could not be encoded" (de+en)
- Replace raw font-weight/line-height with design tokens in app-topbar.css
- Fix import ordering in SchedulerRunService.php (php-cs-fixer)
- Fix PHPStan mock chain errors in DebitorDetailServiceTest and TenantSsoServiceTest (PHPUnit 12 API)
- Simplify redundant comparison in NotificationService dedupe window
- Add PHPStan type hint for mock callback array in SchedulerJobFailedNotificationListenerTest
- Fix undefined variable and add flow-analysis suppression in login().php
- Increase dev PHP memory_limit to 1G for PHPStan (prod stays 256M)

All 6 quality gates now pass: QG-001 (1618 tests), QG-002 (0 errors),
QG-003 (6630 assertions), QG-006 (0 fixable), QG-008, QG-009.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/helpdesk/tests/Module/Helpdesk/Service/DebitorDetailServiceTest.php

@@ -1350,7 +1350,7 @@ class DebitorDetailServiceTest extends TestCase
     {
         $futureDate = date('Y-m-d', strtotime('+7 days'));
         $gateway = $this->createMock(BcODataGateway::class);
-        $gateway->method('getMeetingsForCustomer')->with('10254')->willReturn([
+        $gateway->expects($this->any())->method('getMeetingsForCustomer')->with('10254')->willReturn([
             ['Entry_No' => 1, 'Appointment_Date' => $futureDate, 'Customer_No' => '10254', 'Customer_Name' => 'Test GmbH', 'Salesperson_Code' => 'MER', 'Comment' => 'Workshop', 'Released_by' => '', 'Release_Date' => '0001-01-01'],
         ]);