feat: special treatment of participants with age 0-2 (babies)

src/Form/Model/ParticipantDto.php

@@ -78,7 +78,8 @@ class ParticipantDto
     public array $courses = [];
     public array $additionalServices = [];
 
-    #[Assert\NotNull(message: 'Bitte auswählen', groups: ['strict_required'])]
+    // Note: Ski pass validation is conditional - see ParticipantEditDto::validateSkiPassRequired()
+    // Babies (0-2 years) are exempt from ski pass requirement
     public ?Service $skiPass = null;
 
     public array $board = [];