feat(helpdesk): add handover protocol management

Implement handover protocols as a new entity in the helpdesk module,
allowing users to create fillable protocol records from admin-defined
software product schemas.

Key additions:
- DB migration (helpdesk_handovers table) with tenant scope
- HandoverService with status workflow (draft/in_progress/completed/archived)
- Three-tier permissions (view/create/manage)
- Two-step creation wizard (Stripe-style assistant)
- Grid.js list page with search and status filter
- Edit/detail page with aside metadata and status controls
- Reusable core autocomplete lookup component (app-lookup-field)
- Debitor lookup data endpoint for autocomplete
- Dynamic form rendering from schema snapshots
- 11 PHPUnit tests for HandoverService
- DE+EN i18n translations (48 keys each)

Also includes: PHPStan fixes (dead code removal, stale baseline cleanup),
software product edit title improvement, fieldset simplification,
and Stripe-style hover for schema preview.

Workflow: HD-HANDOVERS-001 (.agents/runs/HD-HANDOVERS-001/)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/helpdesk/lib/Module/Helpdesk/HelpdeskContainerRegistrar.php

@@ -20,7 +20,9 @@ use MintyPHP\Module\Helpdesk\Service\SoftwareProductSyncService;
 use MintyPHP\Module\Helpdesk\Service\SystemRecommendationEngine;
 use MintyPHP\Module\Helpdesk\Service\TicketCommunicationService;
 use MintyPHP\Module\Helpdesk\Handler\SoftwareProductSyncJobHandler;
+use MintyPHP\Module\Helpdesk\Repository\HandoverRepository;
 use MintyPHP\Module\Helpdesk\Repository\SoftwareProductRepository;
+use MintyPHP\Module\Helpdesk\Service\HandoverService;
 use MintyPHP\Service\Access\PermissionService;
 use MintyPHP\Service\Settings\SettingServicesFactory;
 use MintyPHP\Service\Settings\SettingsMetadataGateway;
@@ -104,5 +106,12 @@ final class HelpdeskContainerRegistrar implements ContainerRegistrar
         $container->set(SoftwareProductSyncJobHandler::class, static fn (AppContainer $c): SoftwareProductSyncJobHandler => new SoftwareProductSyncJobHandler(
             $c->get(SoftwareProductSyncService::class)
         ));
+
+        $container->set(HandoverRepository::class, static fn (): HandoverRepository => new HandoverRepository());
+
+        $container->set(HandoverService::class, static fn (AppContainer $c): HandoverService => new HandoverService(
+            $c->get(HandoverRepository::class),
+            $c->get(SoftwareProductService::class)
+        ));
     }
 }