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/models/order_email_test.rb

@@ -8,31 +8,31 @@ class OrderEmailTest < ActiveSupport::TestCase
   test "sends purchase confirmation email when order is marked as paid" do
     # Mock the mailer to capture the call
     TicketMailer.expects(:purchase_confirmation_order).with(@order).returns(stub(deliver_now: true))
-    
+
     @order.mark_as_paid!
-    
+
     assert_equal "paid", @order.status
   end
 
   test "activates all tickets when order is marked as paid" do
     @order.tickets.update_all(status: "reserved")
-    
+
     # Mock the mailer to avoid actual email sending
     TicketMailer.stubs(:purchase_confirmation_order).returns(stub(deliver_now: true))
-    
+
     @order.mark_as_paid!
-    
+
     assert @order.tickets.all? { |ticket| ticket.status == "active" }
   end
 
   test "email sending failure does not prevent order completion" do
     # Mock mailer to raise an error
     TicketMailer.stubs(:purchase_confirmation_order).raises(StandardError.new("Email error"))
-    
+
     # Should not raise error - email failure is logged but doesn't fail the payment
     @order.mark_as_paid!
-    
+
     # Order should still be marked as paid even if email fails
     assert_equal "paid", @order.reload.status
   end
-end
+end