feat: add two- and four-weekly series and drop the weekday picker

src/Form/BookingRequest.php

@@ -28,9 +28,6 @@ final class BookingRequest
 
     public ?RecurrenceRule $repeat = null;
 
-    /** @var list<int> ISO weekdays, 1 = Monday */
-    public array $weekdays = [];
-
     public ?\DateTimeImmutable $until = null;
 
     public function __construct(?\DateTimeImmutable $date = null, ?TimeRange $time = null)
@@ -92,10 +89,6 @@ final class BookingRequest
             return;
         }
 
-        if (RecurrenceRule::WEEKLY === $this->repeat && [] === $this->weekdays) {
-            $context->buildViolation('Bitte mindestens einen Wochentag wählen.')->atPath('weekdays')->addViolation();
-        }
-
         if (null === $this->until) {
             $context->buildViolation('Bitte ein Enddatum für die Serie angeben.')->atPath('until')->addViolation();