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/app/middleware/portal.ts

@@ -0,0 +1,12 @@
+/**
+ * Named middleware for portal pages (`/portal/**`).
+ * Ensures the user is authenticated. Access is open to every authenticated user
+ * (ROLE_CLIENT see their portal, ROLE_ADMIN/ROLE_USER may preview it).
+ */
+export default defineNuxtRouteMiddleware(() => {
+    const auth = useAuthStore()
+
+    if (!auth.isAuthenticated) {
+        return navigateTo('/login')
+    }
+})