fix architecture and write new tests

apps/admin/src/app/dashboard/notifications/page.tsx

@@ -56,14 +56,13 @@ export default function AdminNotificationsPage() {
   function load(p: number) {
     setLoading(true)
     setError(null)
-    const token = localStorage.getItem('admin_token') ?? ''
     const params = new URLSearchParams({ page: String(p), pageSize: '50' })
     if (filterChannel) params.set('channel', filterChannel)
     if (filterStatus)  params.set('status',  filterStatus)
     if (filterCompany) params.set('companyId', filterCompany)
 
     fetch(`${ADMIN_API_BASE}/admin/notifications?${params.toString()}`, {
-      headers: { Authorization: `Bearer ${token}` },
+      credentials: 'include',
       cache: 'no-store',
     })
       .then((r) => r.json())