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/invoices_csv.rb

@@ -0,0 +1,39 @@
+require 'csv'
+
+class InvoicesCsv < RenderCsv
+  include ApplicationHelper
+
+  def header
+    [
+      Invoice.human_attribute_name(:created_at),
+      Invoice.human_attribute_name(:created_by),
+      Invoice.human_attribute_name(:date),
+      Invoice.human_attribute_name(:supplier),
+      Invoice.human_attribute_name(:number),
+      Invoice.human_attribute_name(:amount),
+      Invoice.human_attribute_name(:total),
+      Invoice.human_attribute_name(:deposit),
+      Invoice.human_attribute_name(:deposit_credit),
+      Invoice.human_attribute_name(:paid_on),
+      Invoice.human_attribute_name(:note)
+    ]
+  end
+
+  def data
+    @object.each do |t|
+      yield [
+        t.created_at,
+        show_user(t.created_by),
+        t.date,
+        t.supplier.name,
+        t.number,
+        t.amount,
+        t.expected_amount,
+        t.deposit,
+        t.deposit_credit,
+        t.paid_on,
+        t.note
+      ]
+    end
+  end
+end