feat(helpdesk): add Software Products page with BC contract type sync

Add a new Software-Produkte feature to the helpdesk module that syncs
contract types (Create_SaaS_License=true) from BC OData into a local
database table with a nightly scheduler job, providing a Grid.js list
page and detail/edit page for managing custom product names.

- DB migration 003: helpdesk_software_products table (code UNIQUE key)
- BcODataGateway: FS_Contract_Types entity with SaaS filter + fallback
- SoftwareProductRepository: upsert, listPaged, softDelete, updateName
- SoftwareProductSyncService: fetch → upsert → soft-delete lifecycle
- SoftwareProductSyncJobHandler: daily at 02:00 via scheduler platform
- SoftwareProductService: web UI business logic with validation
- Permission: helpdesk.software-products.manage (nav-gated)
- List page: Grid.js with Code, BC Description, Name, Status columns
- Detail page: Code/BC Description read-only, Name editable, PRG pattern
- i18n: de + en translation keys

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

modules/helpdesk/lib/Module/Helpdesk/Providers/HelpdeskLayoutProvider.php

@@ -21,16 +21,19 @@ final class HelpdeskLayoutProvider implements LayoutContextProvider
             $canManageSettings = $authorizationService->authorize('helpdesk.settings.manage', $actorContext)->isAllowed();
             $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();
         } catch (\Throwable) {
             $canManageSettings = false;
             $canViewTeam = false;
             $canViewRiskRadar = false;
+            $canManageSoftwareProducts = false;
         }
 
         return ['helpdesk.nav' => [
             'can_manage_settings' => $canManageSettings,
             'can_view_team' => $canViewTeam,
             'can_view_risk_radar' => $canViewRiskRadar,
+            'can_manage_software_products' => $canManageSoftwareProducts,
         ]];
     }
 }