chore: adopt namespace pattern for accommodation booking controllers

templates/email/_price_breakdown.html.twig

@@ -1,5 +1,5 @@
 {#- Prices only — travel dates and group size belong to _stay_details.html.twig and the
-    PDF's own data block. Mirrors groups/booking/_offer_summary.html.twig, but with inline
+    PDF's own data block. Mirrors groups/offer/_summary.html.twig, but with inline
     styles: neither the email layout nor dompdf ships table styling or Tailwind.
     Context: booking, priceBreakdown, currency (set in AccommodationBookingService and
     AccommodationBookingPdfGenerator). -#}