Fix user detail endpoint response format

Wrap user detail response in { data: { user } } to match frontend expectation.

routes/admin.js

@@ -106,9 +106,11 @@ router.get('/users/:id', async (req, res) => {
       .toArray();
 
     res.json({
-      user: {
+      data: {
-        ...user,
+        user: {
-        recentActivity
+          ...user,
+          recentActivity
+        }
       }
     });
   } catch (error) {