rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

app/lib/articles_csv.rb

@@ -0,0 +1,43 @@
+class ArticlesCsv < RenderCsv
+  include ApplicationHelper
+
+  def header
+    [
+      Article.human_attribute_name(:availability_short),
+      Article.human_attribute_name(:order_number),
+      Article.human_attribute_name(:name),
+      Article.human_attribute_name(:note),
+      Article.human_attribute_name(:manufacturer),
+      Article.human_attribute_name(:origin),
+      Article.human_attribute_name(:unit),
+      Article.human_attribute_name(:price),
+      Article.human_attribute_name(:tax),
+      Article.human_attribute_name(:deposit),
+      Article.human_attribute_name(:unit_quantity),
+      '',
+      '',
+      Article.human_attribute_name(:article_category)
+    ]
+  end
+
+  def data
+    @object.each do |o|
+      yield [
+        '',
+        o.order_number,
+        o.name,
+        o.note,
+        o.manufacturer,
+        o.origin,
+        o.unit,
+        o.price,
+        o.tax,
+        o.deposit,
+        o.unit_quantity,
+        '',
+        '',
+        o.article_category.try(:name)
+      ]
+    end
+  end
+end