fix: give chatbot pickups per-leg surcharges including the return leg

src/Service/ProductExportBuilder.php

@@ -188,7 +188,8 @@ class ProductExportBuilder
     }
 
     /**
-     * Outbound boarding points joined against zustiege.xml, in source order.
+     * Outbound boarding points joined against zustiege.xml, in source order, each with the
+     * same point's return-leg entry. A point listed on the return leg only is not emitted.
      *
      * getPickups() resolves both zeit shapes and rolls a bare time past midnight onto the
      * next day. Entries with id 0 are kept: the consumer drops them itself.
@@ -206,6 +207,7 @@ class ProductExportBuilder
     {
         $resolved = [];
         $clockDate = new \DateTimeImmutable($dateFrom->format('Y-m-d'), new \DateTimeZone('UTC'));
+        $returnLegs = $this->travelParser->getPickups($this->productExportParser->children($dateNode, 'zustiege_rueck/zustieg_rueck'), null, false);
 
         foreach ($this->travelParser->getPickups($this->productExportParser->children($dateNode, 'zustiege/zustieg'), $clockDate, true) as $pickup) {
             $pickupId = (int) $pickup->id;
@@ -221,6 +223,8 @@ class ProductExportBuilder
                 'city' => $details?->city,
                 'street' => $details?->street,
                 'price' => $pickup->price,
+                'returnLeg' => isset($returnLegs[$pickupId]),
+                'returnPrice' => ($returnLegs[$pickupId] ?? null)?->price,
                 'datetime' => $pickup->time?->format('Y-m-d\TH:i:s'),
             ];
         }