feat: Complete email notifications system with comprehensive functionality

- Implement comprehensive email notification system for ticket purchases and event reminders
- Add event reminder job with configurable scheduling
- Enhance ticket mailer with QR code generation and proper formatting
- Update order model with email delivery tracking
- Add comprehensive test coverage for all email functionality
- Configure proper mailer settings and disable annotations
- Update backlog to reflect completed email features

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

test/mailers/ticket_mailer_test.rb

@@ -21,11 +21,11 @@ class TicketMailerTest < ActionMailer::TestCase
       email.deliver_now
     end
 
-    assert_equal ["no-reply@aperonight.fr"], email.from
-    assert_equal [@user.email], email.to
+    assert_equal [ "no-reply@aperonight.fr" ], email.from
+    assert_equal [ @user.email ], email.to
     assert_equal "Confirmation d'achat - #{@event.name}", email.subject
     assert_match @event.name, email.body.to_s
-    assert_match @user.email.split('@').first, email.body.to_s
+    assert_match @user.email.split("@").first, email.body.to_s
   end
 
   test "purchase confirmation single ticket email" do
@@ -38,11 +38,11 @@ class TicketMailerTest < ActionMailer::TestCase
       email.deliver_now
     end
 
-    assert_equal ["no-reply@aperonight.fr"], email.from
-    assert_equal [@ticket.user.email], email.to
+    assert_equal [ "no-reply@aperonight.fr" ], email.from
+    assert_equal [ @ticket.user.email ], email.to
     assert_equal "Confirmation d'achat - #{@ticket.event.name}", email.subject
     assert_match @ticket.event.name, email.body.to_s
-    assert_match @ticket.user.email.split('@').first, email.body.to_s
+    assert_match @ticket.user.email.split("@").first, email.body.to_s
   end
 
   test "event reminder email one week before" do
@@ -56,8 +56,8 @@ class TicketMailerTest < ActionMailer::TestCase
         email.deliver_now
       end
 
-      assert_equal ["no-reply@aperonight.fr"], email.from
-      assert_equal [@user.email], email.to
+      assert_equal [ "no-reply@aperonight.fr" ], email.from
+      assert_equal [ @user.email ], email.to
       assert_equal "Rappel : #{@event.name} dans une semaine", email.subject
       assert_match "une semaine", email.body.to_s
       assert_match @event.name, email.body.to_s
@@ -101,4 +101,4 @@ class TicketMailerTest < ActionMailer::TestCase
     assert_equal "Rappel : #{@event.name} dans 3 jours", email.subject
     assert_match "3 jours", email.body.to_s
   end
-end
+end