feat: add email notification channel

server/src/lib/email.js

@@ -4,14 +4,8 @@ function hasSmtpEnv() {
   return Boolean(process.env.SMTP_HOST && process.env.SMTP_PORT && process.env.SMTP_USER && process.env.SMTP_PASS)
 }
 
-export async function sendLoginCodeEmail({ to, code }) {
-  if (!hasSmtpEnv()) {
-    // dev fallback
-    console.log(`[DEV] login code for ${to}: ${code}`)
-    return
-  }
-
-  const transporter = nodemailer.createTransport({
+function createTransporter() {
+  return nodemailer.createTransport({
     host: process.env.SMTP_HOST,
     port: Number(process.env.SMTP_PORT),
     secure: process.env.SMTP_SECURE === 'true',
@@ -20,7 +14,15 @@ export async function sendLoginCodeEmail({ to, code }) {
       pass: process.env.SMTP_PASS,
     },
   })
+}
 
+export async function sendLoginCodeEmail({ to, code }) {
+  if (!hasSmtpEnv()) {
+    console.log(`[DEV] login code for ${to}: ${code}`)
+    return
+  }
+
+  const transporter = createTransporter()
   const from = process.env.MAIL_FROM || process.env.SMTP_USER
 
   await transporter.sendMail({
@@ -31,3 +33,24 @@ export async function sendLoginCodeEmail({ to, code }) {
   })
 }
 
+export async function sendNotificationEmail({ to, subject, html }) {
+  if (!hasSmtpEnv()) {
+    console.log(`[DEV] notification email to ${to}: ${subject}`)
+    return { success: true }
+  }
+
+  try {
+    const transporter = createTransporter()
+    const from = process.env.MAIL_FROM || process.env.SMTP_USER
+
+    await transporter.sendMail({
+      from,
+      to,
+      subject,
+      html,
+    })
+    return { success: true }
+  } catch (err) {
+    return { success: false, error: err.message }
+  }
+}