feat: add date_of_birth field to persons across all layers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Http/Requests/Api/V1/UpdatePersonRequest.php

@@ -20,6 +20,7 @@ final class UpdatePersonRequest extends FormRequest
             'crowd_type_id' => ['sometimes', 'ulid', 'exists:crowd_types,id'],
             'first_name' => ['sometimes', 'string', 'max:255'],
             'last_name' => ['sometimes', 'string', 'max:255'],
+            'date_of_birth' => ['nullable', 'date', 'before:today'],
             'email' => ['sometimes', 'email', 'max:255'],
             'phone' => ['nullable', 'string', 'max:30'],
             'company_id' => ['nullable', 'ulid', 'exists:companies,id'],