add composer-unused, comprehensive docs, and project restructure

- Add icanhazstring/composer-unused as dev dependency for dependency hygiene checks
- Add German documentation (docs/) covering architecture, conventions, workflows, and developer checklists
- Add API layer (ApiAuth, ApiBootstrap, ApiResponse), audit, scheduler, custom fields, and SSO services
- Add Microsoft OIDC SSO, API token management, and user lifecycle features
- Add swagger-ui vendor integration and OpenAPI spec
- Add production Docker setup and bin/ scripts
- Update composer dependencies, config, templates, and frontend assets throughout

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

pages/admin/users/bulk($action).php

@@ -1,12 +1,11 @@
 <?php
 
 use MintyPHP\Support\Guard;
-use MintyPHP\Http\Request;
 use MintyPHP\Router;
 use MintyPHP\Service\Access\PermissionService;
 use MintyPHP\Service\User\UserService;
+use MintyPHP\Service\User\UserAccessTemplateService;
 use MintyPHP\Service\Mail\MailService;
-use MintyPHP\I18n;
 
 Guard::requireLogin();
 
@@ -92,32 +91,10 @@ function handleSendAccess(array $uuids, int $currentUserId): void
             continue;
         }
 
-        $locale = $user['locale'] ?? (I18n::$locale ?? I18n::$defaultLocale);
-        $name = trim(($user['first_name'] ?? '') . ' ' . ($user['last_name'] ?? ''));
-        $isGerman = strpos((string) $locale, 'de') === 0;
-        $greeting = $isGerman ? 'Hallo' : 'Hello';
-        if ($name !== '') {
-            $greeting .= ' ' . $name;
-        }
-        $greeting .= ',';
-
-        $loginUrl = appUrl(Request::withLocale('login', $locale));
-        $resetUrl = appUrl(Request::withLocale('password/forgot', $locale));
-        $previousLocale = I18n::$locale ?? null;
-        I18n::$locale = $locale;
-        $subject = t('Your access details');
-        I18n::$locale = $previousLocale;
-
-        $vars = [
-            'app_name' => appTitle(),
-            'app_logo_url' => appLogoUrlAbsolute(128),
-            'imprint_url' => appUrl(Request::withLocale('imprint', $locale)),
-            'privacy_url' => appUrl(Request::withLocale('privacy', $locale)),
-            'greeting' => $greeting,
-            'username' => (string) ($user['email'] ?? ''),
-            'login_url' => $loginUrl,
-            'reset_url' => $resetUrl,
-        ];
+        $context = UserAccessTemplateService::buildContext($user);
+        $locale = (string) ($context['locale'] ?? '');
+        $subject = (string) ($context['subject'] ?? t('Your access details'));
+        $vars = is_array($context['vars'] ?? null) ? $context['vars'] : [];
 
         $result = MailService::sendTemplate('access_info', $vars, (string) $user['email'], $subject, $locale);
         if ($result['ok'] ?? false) {