feat: Implement complete ticket purchasing flow with new TicketsController

- Create new TicketsController with actions for name collection, creation, and checkout
- Add dedicated ticket views (new.html.erb, checkout.html.erb, show.html.erb)
- Update ticket_selection_controller.js to handle form submission via AJAX
- Add store_cart endpoint in EventsController for session-based cart management
- Update routes to support new ticket flow: /tickets/new, /create, /checkout
- Fix attribute name consistency across views (title→name, starts_at→start_time)
- Add Stripe checkout integration with proper error handling
- Remove deprecated collect_names flow in favor of streamlined approach

The flow is now: Event selection → AJAX cart storage → Name collection → Checkout → Payment

config/database.yml

@@ -16,7 +16,7 @@ default: &default
   username: <%= ENV.fetch("DB_USERNAME") { "root" } %>
   password: <%= ENV.fetch("DB_PASSWORD") { "root" } %>
   host: <%= ENV.fetch("DB_HOST") { "127.0.0.1" } %>
-  port: <%= ENV.fetch("DB_port") { 3306 } %>
+  port: <%= ENV.fetch("DB_PORT") { 3306 } %>
 
 development:
   <<: *default