refactor: Simplify PDF ticket download functionality

- Rename download_ticket action to download for consistency
- Use QR code lookup consistently in both show and download actions
- Simplify routes to use QR code pattern for both viewing and downloading
- Remove complex dual-lookup logic in favor of consistent QR code access
- Clean up route constraints and duplicate route definitions

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

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

config/routes.rb

@@ -53,7 +53,7 @@ Rails.application.routes.draw do
   get   "orders/payments/success", to: "orders#payment_success",  as: "order_payment_success"
   get   "orders/payments/cancel",  to: "orders#payment_cancel",   as: "order_payment_cancel"
 
-  # Legacy routes - redirect to order system  
+  # Legacy routes - redirect to order system
   get   "events/:slug.:id/tickets/checkout", to: "tickets#checkout", as: "ticket_checkout"
   post  "events/:slug.:id/tickets/retry",    to: "tickets#retry_payment", as: "ticket_retry_payment"
   get   "payments/success", to: "tickets#payment_success", as: "payment_success"
@@ -61,9 +61,8 @@ Rails.application.routes.draw do
 
   # === Tickets ===
   # Support both ticket_id and qr_code for backward compatibility
-  get   "tickets/:qr_code", to: "tickets#show", as: "ticket", constraints: { qr_code: /[^\/]+/ }
-  get   "tickets/:ticket_id", to: "tickets#show", as: "ticket_by_id"
-  get   "tickets/:ticket_id/download", to: "tickets#download_ticket", as: "download_ticket"
+  get   "tickets/:qr_code", to: "tickets#show", as: "ticket"
+  get   "tickets/:qr_code/download", to: "tickets#download", as: "ticket_download"
 
   # === Promoter Routes ===
   namespace :promoter do