Wire SMTP env vars into main-site container, document in .env.example

Contact form needs SMTP_HOST/PORT/SECURE/USER/PASS and CONTACT_TO passed
through docker-compose. Added to main-site environment block and documented
in .env.example.

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

.env.example

@@ -14,3 +14,14 @@
 #
 # All other secrets (access tokens, passwords, etc.) belong only in estore/.env
 # — never put them here.
+
+# ── Main site admin ───────────────────────────────────────────────────────────
+MAIN_ADMIN_PASSWORD=
+
+# ── Contact form (main-site) ──────────────────────────────────────────────────
+SMTP_HOST=mail.beachpartyballoons.com
+SMTP_PORT=587
+SMTP_SECURE=false
+SMTP_USER=info@beachpartyballoons.com
+SMTP_PASS=
+CONTACT_TO=info@beachpartyballoons.com

docker-compose.yml

@@ -25,6 +25,12 @@ services:
     environment:
       NODE_ENV: production
       ADMIN_PASSWORD: ${MAIN_ADMIN_PASSWORD}
+      SMTP_HOST: ${SMTP_HOST}
+      SMTP_PORT: ${SMTP_PORT:-587}
+      SMTP_SECURE: ${SMTP_SECURE:-false}
+      SMTP_USER: ${SMTP_USER}
+      SMTP_PASS: ${SMTP_PASS}
+      CONTACT_TO: ${CONTACT_TO}
     volumes:
       - ./main-site/update.json:/usr/src/app/update.json
     restart: always