add no-JS fallback for contact page order tracking form

Both order tracking forms now have action="/contact/lookup" so they
POST to a new OrderLookupController.lookup action when JS is off.
The controller mirrors the LiveView handler: checks for paid orders,
sends the verification email, and redirects with a flash message.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/router.ex

@@ -90,6 +90,9 @@ defmodule BerrypodWeb.Router do
     # Checkout (POST — creates Stripe session and redirects)
     post "/checkout", CheckoutController, :create
 
+    # Order lookup (no-JS fallback for contact page form)
+    post "/contact/lookup", OrderLookupController, :lookup
+
     # Cart form actions (no-JS fallbacks for LiveView cart events)
     post "/cart/add", CartController, :add
     post "/cart/remove", CartController, :remove