feat: BCC team@valleyofthecommons.com on all registration/signup emails

Adds BCC to application confirmation, payment confirmation, and
waitlist welcome emails for team visibility over signups.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/application.js

@@ -331,6 +331,7 @@ module.exports = async function handler(req, res) {
           const info = await smtp.sendMail({
             from: process.env.EMAIL_FROM || 'Valley of the Commons <contact@valleyofthecommons.com>',
             to: application.email,
+            bcc: 'team@valleyofthecommons.com',
             subject: confirmEmail.subject,
             html: confirmEmail.html,
           });

api/mollie.js

@@ -210,6 +210,7 @@ async function handleWebhook(req, res) {
           const info = await smtp.sendMail({
             from: process.env.EMAIL_FROM || 'Valley of the Commons <contact@valleyofthecommons.com>',
             to: application.email,
+            bcc: 'team@valleyofthecommons.com',
             subject: confirmEmail.subject,
             html: confirmEmail.html,
           });

api/waitlist-db.js

@@ -199,6 +199,7 @@ module.exports = async function handler(req, res) {
         const info = await smtp.sendMail({
           from: process.env.EMAIL_FROM || 'Valley of the Commons <contact@valleyofthecommons.com>',
           to: signup.email,
+          bcc: 'team@valleyofthecommons.com',
           subject: email.subject,
           html: email.html,
         });