feat: simplify handling of ski pass service

src/BusProNet/DataProcessor/BookingDataProcessor.php

@@ -120,11 +120,15 @@ class BookingDataProcessor
         $servicesToMap = [
             ...$participant->courses,
             ...$participant->additionalServices,
-            ...($participant->skiPass ? [$participant->skiPass] : []),
             ...$participant->board,
             ...$participant->rentals,
         ];
 
+        // Add ski pass if selected (single service, not an array)
+        if (null !== $participant->skiPass) {
+            $servicesToMap[] = $participant->skiPass;
+        }
+
         foreach ($servicesToMap as $service) {
             if (false === isset($bookingData->additionalServices[$service->id])) {
                 $serviceToAdd = $travelData->additionalServices[$service->id] ?? null;

src/BusProNet/Model/Booking.php

@@ -150,6 +150,29 @@ class Booking
         return null;
     }
 
+    /**
+     * Retrieves ski pass for a specific participant.
+     *
+     * Since each participant can only have one ski pass, this method returns
+     * the single ski pass assigned to the participant or null if none is assigned.
+     *
+     * @param int $participantIndex The participant index to search for
+     *
+     * @return Service|null The participant's ski pass or null if not found
+     */
+    public function getSkiPassForParticipant(int $participantIndex): ?Service
+    {
+        $skiPasses = $this->getAdditionalServicesByGroup('SPA');
+
+        foreach ($skiPasses as $service) {
+            if (in_array($participantIndex, $service->mapping)) {
+                return $service;
+            }
+        }
+
+        return null;
+    }
+
     /**
      * Retrieves room assignment for a specific participant.
      *