Update environment variables in resend module

src/lib/server/resend.ts

@@ -11,7 +11,14 @@
 import { Resend } from 'resend';
 import { env } from '$env/dynamic/private';
 
-export const resend = new Resend(env.RESEND_API_KEY);
+let _resend: Resend;
+
+function getResend(): Resend {
+	if (!_resend) {
+		_resend = new Resend(env.RESEND_API_KEY);
+	}
+	return _resend;
+}
 
 /**
  * Send a transactional email using a Resend-hosted template.
@@ -38,7 +45,7 @@ export async function sendMail(options: {
 }) {
 	const { to, subject, templateId, data } = options;
 
-	const result = await resend.emails.send({
+	const result = await getResend().emails.send({
 		from: env.EMAIL_FROM,
 		to: [to],
 		subject: subject ?? 'Template Email',