feat(user) : UI archivage/désarchivage des utilisateurs côté admin

- badge « Archivé » et libellé barré dans la liste admin
- popup de confirmation avant archivage (rappelle que c'est réversible)
- bouton de restauration (PATCH archived:false) pour les archivés
- case « Afficher les utilisateurs archivés » (filtre ?archived=true)
- masque l'action d'archivage sur son propre compte (évite le 403)
- service users : getArchived/restore, toast remove -> users.archived
- i18n FR : clés archived/restored/badge/confirmation

frontend/services/dto/user-data.ts

@@ -10,6 +10,8 @@ export type UserData = {
     effectivePermissions?: string[]
     avatarUrl?: string | null
     apiToken?: string | null
+    // Soft-delete flag: an archived user keeps its data but cannot log in
+    archived?: boolean
     // HR / absence management
     isEmployee?: boolean
     hireDate?: string | null

frontend/services/users.ts

@@ -10,6 +10,13 @@ export function useUserService() {
         return extractHydraMembers(data)
     }
 
+    // Archived users are hidden from the default collection; an admin lists
+    // them explicitly via the `archived` filter (handled server-side).
+    async function getArchived(): Promise<UserData[]> {
+        const data = await api.get<HydraCollection<UserData>>('/users?archived=true')
+        return extractHydraMembers(data)
+    }
+
     async function getById(id: number): Promise<UserData> {
         return api.get<UserData>(`/users/${id}`)
     }
@@ -26,11 +33,19 @@ export function useUserService() {
         })
     }
 
+    // Deleting a user is a soft delete server-side: the account is archived
+    // (kept for referential integrity) rather than removed.
     async function remove(id: number): Promise<void> {
         await api.delete(`/users/${id}`, {}, {
-            toastSuccessKey: 'users.deleted',
+            toastSuccessKey: 'users.archived',
         })
     }
 
-    return { getAll, getById, create, update, remove }
+    async function restore(id: number): Promise<UserData> {
+        return api.patch<UserData>(`/users/${id}`, { archived: false }, {
+            toastSuccessKey: 'users.restored',
+        })
+    }
+
+    return { getAll, getArchived, getById, create, update, remove, restore }
 }