Add API endpoint to fetch menu item tree

app/models/auth/User.model.js

@@ -6,12 +6,21 @@ const AuthUser = require('flitter-auth/model/User')
  * properties here as you need.
  */
 class User extends AuthUser {
+    static get services() {
+        return [...super.services, 'models']
+    }
+
     static get schema() {
         return {...super.schema, ...{
             // other schema fields here
         }}
     }
 
+    async get_root_page() {
+        const Page = this.models.get('api:Page')
+        return Page.findOne({OrgUserId: this._id, ParentId: '0'})
+    }
+
     // Other members and methods here
 }