feat: remove SMTP env vars from Logto compose template

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

templates/docker-compose.saas.yml

@@ -27,12 +27,6 @@ services:
       PG_DB_SAAS: cameleer_saas
       SAAS_ADMIN_USER: ${SAAS_ADMIN_USER:-admin}
       SAAS_ADMIN_PASS: ${SAAS_ADMIN_PASS:?SAAS_ADMIN_PASS must be set in .env}
-      # SMTP (for email verification during registration)
-      SMTP_HOST: ${SMTP_HOST:-}
-      SMTP_PORT: ${SMTP_PORT:-587}
-      SMTP_USER: ${SMTP_USER:-}
-      SMTP_PASS: ${SMTP_PASS:-}
-      SMTP_FROM_EMAIL: ${SMTP_FROM_EMAIL:-noreply@cameleer.io}
     extra_hosts:
       # Logto validates M2M tokens by fetching its own JWKS from ENDPOINT.
       # Route the public hostname back to the Docker host (Traefik on :443)