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/Providers/HelpdeskLayoutProvider.php

@@ -22,11 +22,17 @@ final class HelpdeskLayoutProvider implements LayoutContextProvider
             $canViewTeam = $authorizationService->authorize('helpdesk.team-workload.view', $actorContext)->isAllowed();
             $canViewRiskRadar = $authorizationService->authorize('helpdesk.risk-radar.view', $actorContext)->isAllowed();
             $canManageSoftwareProducts = $authorizationService->authorize('helpdesk.software-products.manage', $actorContext)->isAllowed();
+            $canViewHandovers = $authorizationService->authorize('helpdesk.handovers.view', $actorContext)->isAllowed();
+            $canCreateHandovers = $authorizationService->authorize('helpdesk.handovers.create', $actorContext)->isAllowed();
+            $canManageHandovers = $authorizationService->authorize('helpdesk.handovers.manage', $actorContext)->isAllowed();
         } catch (\Throwable) {
             $canManageSettings = false;
             $canViewTeam = false;
             $canViewRiskRadar = false;
             $canManageSoftwareProducts = false;
+            $canViewHandovers = false;
+            $canCreateHandovers = false;
+            $canManageHandovers = false;
         }
 
         return ['helpdesk.nav' => [
@@ -34,6 +40,9 @@ final class HelpdeskLayoutProvider implements LayoutContextProvider
             'can_view_team' => $canViewTeam,
             'can_view_risk_radar' => $canViewRiskRadar,
             'can_manage_software_products' => $canManageSoftwareProducts,
+            'can_view_handovers' => $canViewHandovers,
+            'can_create_handovers' => $canCreateHandovers,
+            'can_manage_handovers' => $canManageHandovers,
         ]];
     }
 }