优化tenant模式

app/model/Tenant/Tenant.php

@@ -30,9 +30,11 @@ class Tenant extends Model
         'contact_phone' => 'string',
         'contact_email' => 'string',
         'address' => 'string',
+        'domain' => 'string',
         'status' => 'integer',
         'create_time' => 'datetime',
         'update_time' => 'datetime',
+        'delete_time' => 'datetime',
         'remark' => 'string',
     ];
 }