fix: correct nodemailer method name from createTransporter to createTransport

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Co-Authored-By: Claude <noreply@anthropic.com>

server/alertManager.js

@@ -1011,7 +1011,7 @@ class AlertManager extends EventEmitter {
     initializeEmailTransporter() {
         if (process.env.SMTP_HOST) {
             try {
-                this.emailTransporter = nodemailer.createTransporter({
+                this.emailTransporter = nodemailer.createTransport({
                     host: process.env.SMTP_HOST,
                     port: parseInt(process.env.SMTP_PORT) || 587,
                     secure: process.env.SMTP_SECURE === 'true', // true for 465, false for other ports

server/index.js

@@ -776,7 +776,7 @@ app.post('/api/test-email', async (req, res) => {
         
         // Create a temporary transporter for testing
         const nodemailer = require('nodemailer');
-        const testTransporter = nodemailer.createTransporter({
+        const testTransporter = nodemailer.createTransport({
             host: host,
             port: parseInt(port),
             secure: secure === true,