chore: fix phpstan errors

src/Service/BookingPricingAssembler.php

@@ -31,7 +31,7 @@ class BookingPricingAssembler
     /**
      * Assembles a complete pricing breakdown for display or diagnostic use.
      *
-     * @return array{rooms: array, services: array, grandTotal: float, surcharges?: array}
+     * @return array{rooms: array<int, array<string, mixed>>, services: array<int, array<string, mixed>>, grandTotal: float, surcharges?: array<int, array<string, mixed>>}
      */
     public function getPricingBreakdown(
         BookingDto $bookingDto,
@@ -251,7 +251,8 @@ class BookingPricingAssembler
 
         foreach ($serviceAggregation as $serviceData) {
             $subType = $serviceData['subType'] ?? 'other';
-            if (null === $subType || '' === $subType) {
+
+            if ('' === $subType) {
                 $subType = 'other';
             }
 
@@ -308,6 +309,7 @@ class BookingPricingAssembler
         return Constants::SERVICE_LABELS[$subType] ?? 'Sonstige Leistungen';
     }
 
+    /** @param array<string, array<string, mixed>> $serviceAggregation */
     private function aggregateParticipantServices(
         ParticipantDto $participant,
         array &$serviceAggregation,
@@ -338,16 +340,15 @@ class BookingPricingAssembler
         ];
 
         foreach ($multipleServiceArrays as $serviceArray) {
-            if (true === is_array($serviceArray)) {
-                foreach ($serviceArray as $service) {
-                    if ($service instanceof Service && null !== $service->price) {
-                        $this->addToServiceAggregation($serviceAggregation, $service);
-                    }
+            foreach ($serviceArray as $service) {
+                if (null !== $service->price) {
+                    $this->addToServiceAggregation($serviceAggregation, $service);
                 }
             }
         }
     }
 
+    /** @param array<string, array<string, mixed>> $serviceAggregation */
     private function addToServiceAggregation(array &$serviceAggregation, Service $service, int $quantity = 1): void
     {
         $serviceKey = $service->id.'_'.$service->label;
@@ -367,6 +368,7 @@ class BookingPricingAssembler
         $serviceAggregation[$serviceKey]['totalPrice'] += $service->price * $quantity;
     }
 
+    /** @param array<string, array<string, mixed>> $serviceAggregation */
     private function addInsuranceToServiceAggregation(array &$serviceAggregation, Insurance $insurance, int $quantity = 1): void
     {
         $serviceKey = $insurance->id.'_'.$insurance->label;