feat(helpdesk): add Risk Radar dashboard with customer risk scoring

New portfolio view scoring customers 0-100 across five dimensions:
- Open pressure (30%): open + critical ticket count
- Trend (25%): net ticket flow (created - closed) in period
- SLA overdue (20%): tickets exceeding escalation targets
- Resolution time (15%): median hours to close (null = neutral)
- Inactivity (10%): age of oldest open ticket

Card grid with score badges (color-coded high/medium/low), metric
pills, driver bars. Click opens detail dialog with all dimensions
and open ticket list. Clientside search filter.

PBI_LV_Tickets with client-driven paging ($skip/$top, hardcap 5000).
Escalation definitions cached separately (30min TTL). Truncated
banner when data is capped.

New: RiskRadarService, getTicketsForRiskRadar(), 13 PHPUnit tests,
permission helpdesk.risk-radar.view, 2 routes, i18n de+en.

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

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

@@ -20,14 +20,17 @@ final class HelpdeskLayoutProvider implements LayoutContextProvider
             $actorContext = ['actor_user_id' => $userId];
             $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();
         } catch (\Throwable) {
             $canManageSettings = false;
             $canViewTeam = false;
+            $canViewRiskRadar = false;
         }
 
         return ['helpdesk.nav' => [
             'can_manage_settings' => $canManageSettings,
             'can_view_team' => $canViewTeam,
+            'can_view_risk_radar' => $canViewRiskRadar,
         ]];
     }
 }