add folders structure

app/controllers/api/template_folders_autocomplete_controller.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module Api
+  class TemplateFoldersAutocompleteController < ApiBaseController
+    load_and_authorize_resource :template_folder, parent: false
+
+    LIMIT = 100
+
+    def index
+      template_folders = @template_folders.joins(:templates).where(templates: { deleted_at: nil }).distinct
+      template_folders = TemplateFolders.search(template_folders, params[:q]).limit(LIMIT)
+
+      render json: template_folders.as_json(only: %i[name deleted_at])
+    end
+  end
+end