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>

web/js/app-init.js

@@ -1,4 +1,5 @@
 import './components/app-flash-auto-dismiss.js';
+import './components/app-tabs.js';
 import './components/app-fslightbox-refresh.js';
 import './components/app-password-hints.js';
 import './components/app-copy-badge.js';
@@ -7,13 +8,13 @@ import './components/app-nav-history.js';
 import './components/app-toggle-sidebar.js';
 import './components/app-toggle-aside-panels.js';
 import './components/app-toggle-details-aside.js';
-import { initToolbarToggles } from './components/app-toggle-toolbar.js';
+import './components/app-toggle-toolbar.js';
 import './components/app-filter-overflow.js';
 import './components/app-global-search.js';
 import './components/app-theme-toggle.js';
 import './components/app-contrast-toggle.js';
+import './components/app-details-state.js';
 import './components/app-tenant-switcher.js';
-import './components/app-tabs.js';
 import './components/app-color-default-toggle.js';
-
-initToolbarToggles();
+import './components/app-custom-field-options-toggle.js';
+import './components/app-tenant-sso-toggle.js';