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>

config/routes.rb

@@ -38,7 +38,7 @@ Rails.application.routes.draw do
   get "events",                      to: "events#index",           as: "events"
   get "events/:slug.:id",            to: "events#show",            as: "event"
 
-  # === Orders (scoped to events) ===
+  # === Orders ===
   get "events/:slug.:id/orders/new", to: "orders#new", as: "event_order_new"
   post "events/:slug.:id/orders", to: "orders#create", as: "event_order_create"
 
@@ -60,6 +60,7 @@ Rails.application.routes.draw do
   get   "payments/cancel",              to: "tickets#payment_cancel", as: "payment_cancel"
 
   # === Tickets ===
+  get   "tickets/:ticket_id", to: "tickets#show", as: "ticket"
   get   "tickets/:ticket_id/download", to: "events#download_ticket", as: "download_ticket"
 
   # === Promoter Routes ===