mv lib to app/lib use :zeitwerk

plugins/discourse/lib/foodsoft_discourse/redirect_to_login.rb

@@ -18,5 +18,5 @@ end
 
 # modify existing helper
 ActiveSupport.on_load(:after_initialize) do
-  Concerns::Auth.send :include, FoodsoftDiscourse::RedirectToLogin
+  Auth.send :include, FoodsoftDiscourse::RedirectToLogin
 end

plugins/printer/app/controllers/printer_controller.rb

@@ -1,5 +1,5 @@
 class PrinterController < ApplicationController
-  include Concerns::SendOrderPdf
+  include SendOrderPdf
   include Tubesock::Hijack
 
   skip_before_action :authenticate

plugins/printer/app/controllers/printer_jobs_controller.rb

@@ -1,5 +1,5 @@
 class PrinterJobsController < ApplicationController
-  include Concerns::SendOrderPdf
+  include SendOrderPdf
 
   before_action -> { require_plugin_enabled FoodsoftPrinter }