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/dto/absence.ts

@@ -0,0 +1,93 @@
+export type AbsenceType = 'cp' | 'mariage_pacs' | 'conge_parental' | 'deces' | 'maladie'
+export type AbsenceStatus = 'pending' | 'approved' | 'rejected' | 'cancelled'
+export type HalfDay = 'matin' | 'apres_midi'
+
+export type AbsenceUserRef = {
+    '@id'?: string
+    id: number
+    username: string
+    avatarUrl: string | null
+}
+
+export type AbsenceRequest = {
+    '@id'?: string
+    id: number
+    user: AbsenceUserRef
+    type: AbsenceType
+    label: string
+    startDate: string
+    endDate: string
+    startHalfDay: HalfDay | null
+    endHalfDay: HalfDay | null
+    countedDays: number
+    reason: string | null
+    justificationFileName: string | null
+    justificationUrl: string | null
+    status: AbsenceStatus
+    rejectionReason: string | null
+    createdAt: string
+    reviewedAt: string | null
+    reviewedBy: AbsenceUserRef | null
+}
+
+export type AbsenceRequestWrite = {
+    type: AbsenceType
+    startDate: string
+    endDate: string
+    startHalfDay?: HalfDay | null
+    endHalfDay?: HalfDay | null
+    reason?: string | null
+}
+
+export type AbsenceBalance = {
+    '@id'?: string
+    id: number
+    user: AbsenceUserRef
+    type: AbsenceType
+    label: string
+    period: string
+    acquired: number
+    acquiring: number
+    acquiredTotal: number
+    taken: number
+    pending: number
+    available: number
+}
+
+export type AbsencePolicy = {
+    '@id'?: string
+    id: number
+    type: AbsenceType
+    label: string
+    daysPerYear: number | null
+    daysPerEvent: number | null
+    justificationRequired: boolean
+    noticeDays: number
+    countWorkingDaysOnly: boolean
+    active: boolean
+}
+
+export type AbsencePolicyWrite = {
+    daysPerYear?: number | null
+    daysPerEvent?: number | null
+    justificationRequired?: boolean
+    noticeDays?: number
+    countWorkingDaysOnly?: boolean
+    active?: boolean
+}
+
+export type AbsencePreviewPayload = {
+    type: AbsenceType
+    startDate: string
+    endDate: string
+    startHalfDay?: HalfDay | null
+    endHalfDay?: HalfDay | null
+}
+
+export type AbsencePreviewResult = {
+    countedDays: number
+    period: string | null
+    available: number | null
+    projectedAvailable: number | null
+    justificationRequired: boolean
+}