feat(absences) : avancement module absences + suppression du portail client

Deux lots regroupés sur la branche feat/absence-management.

Suppression complète du portail client :
- retire ROLE_CLIENT (security.yaml) ; User::getRoles() ajoute toujours ROLE_USER
- supprime l'entité ClientTicket (+ repo, states, relations), User.client et
  User.allowedProjects, NotificationService, ProjectAllowedExtension, le bloc
  ROLE_CLIENT de MailAccessChecker
- front : pages /portal, layout portal, composants client-ticket/,
  AdminClientTicketTab, services/dto/i18n/docs associés
- fixtures : retire les users client-liot / client-acme
- migration Version20260522110000 (drop client_ticket, user_allowed_projects,
  colonnes liées ; task_document.task_id -> NOT NULL)
- tests : retire les cas obsolètes testant le blocage des clients sur le mail

Module gestion des absences (WIP) :
- entités / migrations (Version20260521160000, Version20260522090000)
- pages absences.vue / team-absences.vue, composants frontend/components/absence/
- services front, AccrueLeaveCommand, PublicHolidayController

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/services/task-documents.ts

@@ -31,17 +31,6 @@ export function useTaskDocumentService() {
         return uploadWithRelation('task', `/api/tasks/${taskId}`, file)
     }
 
-    async function uploadForTicket(clientTicketId: number, file: File): Promise<TaskDocument> {
-        return uploadWithRelation('clientTicket', `/api/client_tickets/${clientTicketId}`, file)
-    }
-
-    async function getByTicket(clientTicketId: number): Promise<TaskDocument[]> {
-        const data = await api.get<HydraCollection<TaskDocument>>('/task_documents', {
-            clientTicket: `/api/client_tickets/${clientTicketId}`,
-        })
-        return extractHydraMembers(data)
-    }
-
     async function remove(id: number): Promise<void> {
         await api.delete(`/task_documents/${id}`, {}, {
             toastSuccessKey: 'taskDocuments.deleted',
@@ -52,5 +41,5 @@ export function useTaskDocumentService() {
         return `${baseURL}/task_documents/${id}/download`
     }
 
-    return { getByTask, upload, uploadForTicket, getByTicket, remove, getDownloadUrl }
+    return { getByTask, upload, remove, getDownloadUrl }
 }