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/modules/project-management/components/TaskCard.vue

@@ -20,6 +20,12 @@
                         name="mdi:flag-variant"
                         class="h-3.5 w-3.5 text-red-600"
                     />
+                    <Icon
+                        v-if="task.clientTicket"
+                        name="heroicons:user-circle"
+                        class="h-3.5 w-3.5 text-primary-500"
+                        :title="$t('clientTicket.linkedTooltip', { number: formatTicketNumber(task.clientTicket.number) })"
+                    />
                 </div>
                 <h4 class="line-clamp-2 text-sm font-semibold text-neutral-900">{{ task.title }}</h4>
             </div>
@@ -103,6 +109,7 @@
 
 <script setup lang="ts">
 import type { Task } from '~/modules/project-management/services/dto/task'
+import { formatTicketNumber } from '~/modules/client-portal/utils/ticket'
 
 const props = withDefaults(defineProps<{
     task: Task