feat: list and respect all surcharges

src/BusProNet/Model/Booking.php

@@ -121,6 +121,13 @@ class Booking
         return $price;
     }
 
+    public function getSurchargesForParticipant(int $participantIndex): array
+    {
+        return array_filter($this->surcharges, function (Surcharge $surcharge) use ($participantIndex) {
+            return in_array($participantIndex, $surcharge->mapping);
+        });
+    }
+
     public function isEditable(): bool
     {
         return $this->travelDate > new \DateTimeImmutable() && false === in_array($this->status, ['S', 'U']);