feat(services): add generator for public holidays in cz

app/Services/WorkingDays/PublicHolidays/PublicHolidaysGeneratorFactory.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\WorkingDays\PublicHolidays;
+
+use App\Services\WorkingDays\PublicHolidays\Generator\PublicHolidaysCzechGenerator;
+use App\Services\WorkingDays\PublicHolidays\Generator\PublicHolidaysGenerator;
+
+/**
+ * Factory for creating public holidays generators
+ */
+class PublicHolidaysGeneratorFactory
+{
+    public function createPublicHolidaysGeneratorForCountry(string $countryCode): PublicHolidaysGenerator
+    {
+        return match ($countryCode) {
+            'CZ' => new PublicHolidaysCzechGenerator(),
+            default => throw new \RuntimeException('Unsupported country code'),
+        };
+    }
+}