feat: implement tenant OAuth flow and guest achievements

app/Models/OAuthClient.php

@@ -14,13 +14,18 @@ class OAuthClient extends Model
         'id',
         'client_id',
         'client_secret',
+        'tenant_id',
         'redirect_uris',
         'scopes',
+        'is_active',
     ];
     
     protected $casts = [
+        'id' => 'string',
+        'tenant_id' => 'integer',
         'scopes' => 'array',
         'redirect_uris' => 'array',
+        'is_active' => 'bool',
         'created_at' => 'datetime',
         'updated_at' => 'datetime',
     ];