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

config/sidebar.php

@@ -25,7 +25,6 @@ return [
             ['label' => 'sidebar.general.dashboard', 'to' => '/', 'icon' => 'mdi:view-dashboard-outline'],
             ['label' => 'sidebar.general.myTasks', 'to' => '/my-tasks', 'icon' => 'mdi:clipboard-check-outline', 'module' => 'project-management'],
             ['label' => 'sidebar.general.projects', 'to' => '/projects', 'icon' => 'mdi:folder-outline', 'module' => 'project-management'],
-            ['label' => 'sidebar.general.portal', 'to' => '/portal', 'icon' => 'mdi:account-box-outline', 'module' => 'client-portal'],
             ['label' => 'sidebar.general.timeTracking', 'to' => '/time-tracking', 'icon' => 'mdi:calendar-edit-outline', 'module' => 'time-tracking'],
             // Gating module uniquement (cf. en-tête) : rendu visuel + badge gérés côté layout.
             ['label' => 'sidebar.general.mail', 'to' => '/mail', 'icon' => 'mdi:email-outline', 'module' => 'mail'],
@@ -37,7 +36,7 @@ return [
         'roles' => ['ROLE_ADMIN'],
         'items' => [
             ['label' => 'sidebar.admin.teamAbsences', 'to' => '/team-absences', 'icon' => 'mdi:calendar-account-outline', 'module' => 'absence'],
-            ['label' => 'sidebar.admin.directory', 'to' => '/directory', 'icon' => 'mdi:contact-multiple-outline', 'module' => 'directory'],
+            ['label' => 'sidebar.admin.directory', 'to' => '/directory', 'icon' => 'mdi:card-account-details-outline', 'module' => 'directory'],
             ['label' => 'sidebar.admin.administration', 'to' => '/admin', 'icon' => 'mdi:cog-outline', 'permission' => 'core.users.view'],
             ['label' => 'sidebar.admin.reporting', 'to' => '/reporting', 'icon' => 'mdi:chart-line', 'module' => 'reporting', 'permission' => 'reporting.view'],
         ],