fix architecture and write new tests

apps/admin/src/app/dashboard/admin-users/page.tsx

@@ -33,13 +33,11 @@ export default function AdminUsersPage() {
   const [form, setForm] = useState(EMPTY_FORM)
   const [saving, setSaving] = useState(false)
 
-  function getToken() { return localStorage.getItem('admin_token') ?? '' }
-
   async function fetchAdmins() {
     try {
       const res = await fetch(`${ADMIN_API_BASE}/admin/admins`, {
-        headers: { Authorization: `Bearer ${getToken()}` },
         cache: 'no-store',
+        credentials: 'include',
       })
       const json = await res.json()
       if (!res.ok) throw new Error(json?.message ?? 'Failed')
@@ -97,7 +95,8 @@ export default function AdminUsersPage() {
 
       const res = await fetch(`${ADMIN_API_BASE}/admin/admins${editingAdminId ? `/${editingAdminId}` : ''}`, {
         method: isEditing ? 'PATCH' : 'POST',
-        headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${getToken()}` },
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
         body: JSON.stringify(payload),
       })
       const json = await res.json()