feat: Merge PDF ticket generation functionality from feat/pdf-ticket branch

- Add TicketPdfGenerator service for creating PDF tickets with QR codes
- Implement download_ticket action in TicketsController
- Update ticket routes to support both ID and QR code access
- Add to_pdf method to Ticket model using TicketPdfGenerator
- Resolve conflicts between email notifications and PDF ticket features
- Maintain backward compatibility with existing QR code routes

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

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

app/javascript/controllers/ticket_selection_controller.js

@@ -118,7 +118,7 @@ export default class extends Controller {
       await this.storeCartInSession(cartData);
 
       // Redirect to event-scoped orders/new page
-      const OrderNewUrl = `/events/${this.eventSlugValue}.${this.eventIdValue}/orders/new`;
+      const OrderNewUrl = `/orders/new/events/${this.eventSlugValue}.${this.eventIdValue}`;
       window.location.href = OrderNewUrl;
     } catch (error) {
       console.error("Error storing cart:", error);