chore: 🤖 add placeholer auth-token model

addons/api/addon/generated/models/auth-token.js

@@ -0,0 +1,8 @@
+import BaseModel from '../../models/base';
+
+/**
+ * NOTE:  we don't yet use this model for display in the UI and thus no
+ * attributes are included at this time.  This model is used only for
+ * validating that an auth token exists.
+ */
+export default class GeneratedAuthTokenModel extends BaseModel {}