Fix transfer recipient emails not sending in production.

Map MAIL_ENCRYPTION to a valid SMTP scheme, send recipient notifications
synchronously, document mail/queue env vars, and add a supervisor worker template.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/shared.env.example

@@ -28,6 +28,17 @@ SESSION_DRIVER=database
 SESSION_LIFETIME=120
 SESSION_DOMAIN=.ladill.com
 
+QUEUE_CONNECTION=database
+
+MAIL_MAILER=smtp
+MAIL_HOST=mail.ladill.com
+MAIL_PORT=587
+MAIL_USERNAME=noreply@ladill.com
+MAIL_PASSWORD=
+MAIL_ENCRYPTION=tls
+MAIL_FROM_ADDRESS=noreply@ladill.com
+MAIL_FROM_NAME="Ladill Transfer"
+
 LADILL_SSO_CLIENT_ID=
 LADILL_SSO_CLIENT_SECRET=