refactor(client-portal) : remove client portal feature entirely

- drop ClientPortal module, ClientTicket entity, ROLE_CLIENT and all couplings (Task, TaskDocument, User, Notification) back to an internal-only model

- migration drops client_ticket / user_allowed_projects / related FK columns and removes leftover external client accounts (would otherwise be promoted to ROLE_USER)

- remove client-portal frontend module, admin tickets tab, user portal section, portal nav item and portal/clientTicket i18n keys

- fix directory nav icon (invalid mdi:contact-multiple-outline -> mdi:card-account-details-outline)

- add 'make sync-permissions' target, wire it into install/db-reset and the prod deploy script

frontend/i18n/locales/fr.json

@@ -193,10 +193,7 @@
     "updated": "Utilisateur mis à jour avec succès.",
     "deleted": "Utilisateur supprimé avec succès.",
     "addUser": "Ajouter un utilisateur",
-    "editUser": "Modifier un utilisateur",
-    "clientAccount": "Compte client (portail)",
-    "client": "Client",
-    "allowedProjects": "Projets autorisés"
+    "editUser": "Modifier un utilisateur"
   },
   "admin": {
     "roles": {
@@ -357,8 +354,7 @@
       "myTasks": "Mes tâches",
       "projects": "Projets",
       "timeTracking": "Suivi de temps",
-      "mail": "Messagerie",
-      "portal": "Portail client"
+      "mail": "Messagerie"
     },
     "admin": {
       "section": "Administration",
@@ -949,49 +945,5 @@
       "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"
   }
 }