feat: event registration emails and reminders (reminders untested)

apps/cms/.env.example

@@ -26,6 +26,8 @@ IS_PROXIED=false
 # Log verbosity: fatal | error | warn | info | http | debug | trace
 LOG_LEVEL=info
 # Enable the Strapi cron runner (config/server.ts -> cron.enabled).
+# This also turns on the hourly event-reminder e-mails (see src/lib/event-mail).
+# Needs SMTP below to be real - with no provider configured the job logs errors.
 CRON_ENABLED=false
 # Include relations in webhook payloads. Off by default: heavier payloads.
 WEBHOOKS_POPULATE_RELATIONS=false
@@ -149,6 +151,8 @@ SMTP_USERNAME=your-username
 SMTP_PASSWORD=your-password
 DEFAULT_FROM=no-reply@yourdomain.com
 DEFAULT_REPLY_TO=support@yourdomain.com
+# The values above are also the from/reply-to for the registration
+# confirmation and event-reminder e-mails (src/lib/event-mail.ts).
 
 # Production only - switching the upload provider to S3. Uncomment these after
 # adding @strapi/provider-upload-aws-s3 and editing the upload block in