refactor: Move order creation to event-scoped routes and OrdersController

- Add event-scoped order routes: GET/POST /events/:slug.:id/orders
- Move ticket name collection and order creation logic from TicketsController to OrdersController
- Update OrdersController#new to handle both order summary and name collection
- Add OrdersController#create with full order and ticket creation logic
- Add set_event and order_params methods to OrdersController
- Maintain RESTful design with proper event context

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

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

config/routes.rb

@@ -38,9 +38,9 @@ Rails.application.routes.draw do
   get "events",                      to: "events#index",           as: "events"
   get "events/:slug.:id",            to: "events#show",            as: "event"
 
-  # === Orders ===
-
-  get "orders/new", to: "orders#new", as: "order_new"
+  # === Orders (scoped to events) ===
+  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"
 
   resources :orders, only: [:show] do
     member do
@@ -53,11 +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"
 
-  # === Tickets ===
-  get "tickets/new",       to: "tickets#new",    as: "ticket_new"
-  post "tickets/create",   to: "tickets#create", as: "ticket_create"
-
-  # Keep these for now but they redirect to order system
+  # Legacy ticket 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"