v3: added onboarding email on account creation

.env.example

@@ -27,6 +27,16 @@ GERBEUR_JWT_SECRET=
 # Example: smtps://username:password@smtp.example.com:465
 GERBEUR_SMTPS_URL=
 
+# Sender address used in outgoing emails (e.g. no-reply@example.com)
+# Required when GERBEUR_SMTPS_URL is set.
+GERBEUR_FROM_EMAIL=
+
+# Markdown body for the account creation welcome email.
+# Supports {{username}} and {{site_name}} placeholders.
+# Defaults to a built-in template when unset.
+# Use \n for line breaks in single-line .env values, or use a quoted multiline block.
+GERBEUR_WELCOME_EMAIL_BODY="# Welcome to {{site_name}}!\n\nHi **{{username}}**,\n\nYour account has been created successfully. Welcome aboard!"
+
 # Site name used in OG meta tags
 GERBEUR_SITE_NAME=gerbeur