feat(email): Add "test" kind

Author: pan93412

src/Entity/EmailKind.php

@@ -11,12 +11,14 @@ enum EmailKind: string implements TranslatableInterface
 {
     case Transactional = 'transactional';
     case Marketing = 'marketing';
+    case Test = 'test';
 
     public function trans(TranslatorInterface $translator, ?string $locale = null): string
     {
         return match ($this) {
             self::Transactional => $translator->trans('email-kind.transactional', locale: $locale),
             self::Marketing => $translator->trans('email-kind.marketing', locale: $locale),
+            self::Test => $translator->trans('email-kind.test', locale: $locale),
         };
     }
 }

translations/messages.zh_TW.yaml

@@ -184,3 +184,4 @@ challenge:
 email-kind:
   transactional: 通知型信件
   marketing: 行銷型信件
+  test: 測試用信件