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/services/dto/task.ts

@@ -28,6 +28,14 @@ export type Task = {
     deadline: string | null
     syncToCalendar: boolean
     calendarSyncError: string | null
+    clientTicket: {
+        id: number
+        '@id'?: string
+        number: number
+        type: 'bug' | 'improvement' | 'other'
+        status: 'new' | 'in_progress' | 'done' | 'rejected'
+        title: string
+    } | null
     recurrence: {
         id: number
         '@id'?: string