add message template

app/Enums/MessageTemplateNameEnum.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Enums;
+
+use function PHPUnit\Framework\matches;
+
+enum MessageTemplateNameEnum: string
+{
+    case REGISTER_WELCOME = "register_welcome";
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::REGISTER_WELCOME => nexus_trans("message-template.register_welcome"),
+            default => '',
+        };
+    }
+}