feat(monitoring): add pulse

- Added a new gate called `viewPulse` in the `AuthServiceProvider` class.
- The gate allows only admin users to view the Pulse feature.

app/Models/User.php

@@ -23,6 +23,7 @@ class User extends Authenticatable
         'name',
         'email',
         'password',
+        'admin',
     ];
 
     /**