Fix prezzi pubblici: Premium Light €5/€40, Full €20/€200.

Ripristina le etichette in PriceCatalog usate da prezzi, abbonamento e checkout.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/spec/helpers/public/billing_helper_spec.rb

@@ -32,7 +32,7 @@ RSpec.describe Public::BillingHelper, type: :helper do
       current_interval: "yearly"
     )
     expect(action[:kind]).to eq(:current)
-    expect(action[:label]).to include("€39,90/anno")
+    expect(action[:label]).to include("€40/anno")
   end
 
   it "propone cambio intervallo sullo stesso piano" do