feat: load availability data once per booking session

src/Controller/Booking/Edit/IndexController.php

@@ -168,9 +168,8 @@ class IndexController extends AbstractController
             return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
         }
 
-        // Fetch fresh availabilities when entering participant form
-        // This ensures up-to-date data and populates cache for subsequent HTMX refreshes
-        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel, cached: false);
+        // Use cached availability data (populated during booking init)
+        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel);
 
         // Create wrapper DTO for email uniqueness validation
         $wrapper = new ParticipantEditDto(