feat(client-portal) : portal front + client account admin (phases 1-2 front)

LST-69 (3.2) front. Client portal UI on the phase-1 backend.

- New frontend/modules/client-portal/ layer: /portal (project cards from the
  client's allowedProjects via /me), /portal/projects/[id] (tickets list,
  detail modal, create modal with document upload), client-tickets service +
  DTO, CT-XXX formatting.
- Front tenancy: auth.global.ts redirects a pure ROLE_CLIENT to /portal and
  blocks internal routes; portal pages open to any authenticated user.
- Admin: UserDrawer manages client accounts (ROLE_CLIENT + client +
  allowedProjects); new "Tickets client" admin tab (list, filters, status
  change with required comment on reject, detail modal).
- Kanban/my-tasks: client-ticket icon + tooltip when task.clientTicket is set
  (data via task:read, no extra call). TaskDocument upload generalized with a
  clientTicketId prop. getContent uses native fetch (text response).
- i18n portal/clientTicket keys; sidebar /portal item (module client-portal).

nuxt build passes; /portal routes present, existing routes intact.

frontend/i18n/locales/fr.json

@@ -193,7 +193,10 @@
     "updated": "Utilisateur mis à jour avec succès.",
     "deleted": "Utilisateur supprimé avec succès.",
     "addUser": "Ajouter un utilisateur",
-    "editUser": "Modifier un utilisateur"
+    "editUser": "Modifier un utilisateur",
+    "clientAccount": "Compte client (portail)",
+    "client": "Client",
+    "allowedProjects": "Projets autorisés"
   },
   "admin": {
     "roles": {
@@ -354,7 +357,8 @@
       "myTasks": "Mes tâches",
       "projects": "Projets",
       "timeTracking": "Suivi de temps",
-      "mail": "Messagerie"
+      "mail": "Messagerie",
+      "portal": "Portail client"
     },
     "admin": {
       "section": "Administration",
@@ -423,7 +427,9 @@
     "thisWeek": "Cette semaine",
     "clear": "Effacer",
     "day": "Jour",
-    "weekShort": "Sem."
+    "weekShort": "Sem.",
+    "submit": "Soumettre",
+    "close": "Fermer"
   },
   "gitea": {
     "settings": {
@@ -943,5 +949,49 @@
       "empty": "Aucun prospect trouvé.",
       "allStatuses": "Tous les statuts"
     }
+  },
+  "portal": {
+    "title": "Portail client",
+    "projects": "Mes projets",
+    "openTickets": "tickets ouverts",
+    "newTicket": "Nouveau ticket",
+    "ticketDetail": "Détail du ticket",
+    "noProjects": "Aucun projet accessible.",
+    "noTickets": "Aucun ticket pour le moment."
+  },
+  "clientTicket": {
+    "typeLabel": "Type",
+    "type": {
+      "bug": "Bug",
+      "improvement": "Amélioration",
+      "other": "Autre"
+    },
+    "status": {
+      "label": "Statut",
+      "new": "Nouveau",
+      "in_progress": "En cours",
+      "done": "Terminé",
+      "rejected": "Rejeté"
+    },
+    "title": "Titre",
+    "titleRequired": "Le titre est requis",
+    "description": "Description",
+    "descriptionRequired": "La description est requise",
+    "url": "URL (page concernée)",
+    "statusComment": "Commentaire de statut",
+    "project": "Projet",
+    "submittedBy": "Soumis par",
+    "date": "Date",
+    "created": "Ticket créé",
+    "statusChanged": "Statut mis à jour",
+    "confirmDelete": "Supprimer ce ticket ?",
+    "deleted": "Ticket supprimé",
+    "linkedTooltip": "Lié au ticket client {number}",
+    "rejectionRequired": "Un commentaire est requis pour rejeter un ticket",
+    "changeStatus": "Changer le statut",
+    "adminTab": "Tickets client",
+    "adminTitle": "Tickets client",
+    "filterProject": "Projet",
+    "filterStatus": "Statut"
   }
 }