feat(email): HTTP API transport via Resend (fallback SMTP).

Outbound SMTP ports are often blocked on VPS; EMAIL_TRANSPORT=http_api
sends via Resend HTTPS (Brevo optional). OpenSMTPd/SMTP remain available.

docker/.env.example

@@ -20,7 +20,13 @@ ADMIN_MODER_PASSWORD=замените-сильный-пароль-модерат
 ADMIN_SUPPORT_EMAIL=support@eventhub.local
 ADMIN_SUPPORT_PASSWORD=замените-сильный-пароль-поддержки
 
-# SMTP (пусто SMTP_HOST = только лог; пароль не коммитить)
+# Email: EMAIL_TRANSPORT=auto|smtp|http_api|log (auto: API key → http_api, else SMTP_HOST → smtp, else log)
+EMAIL_TRANSPORT=auto
+# HTTP API (HTTPS — when outbound SMTP ports blocked). Canon: Resend (Brevo optional).
+EMAIL_API_KEY=
+EMAIL_API_PROVIDER=resend
+# EMAIL_API_URL=https://api.resend.com/emails
+# SMTP (пусто SMTP_HOST + нет API key = только лог; пароль не коммитить)
 SMTP_HOST=
 SMTP_PORT=587
 SMTP_USER=

docker/docker-compose.stage.yml

@@ -41,6 +41,10 @@ services:
       - ADMIN_SUPPORT_PASSWORD=${ADMIN_SUPPORT_PASSWORD}
       - CLUSTER_MODE=true
       - DNS_NAME=eventhub-node
+      - EMAIL_TRANSPORT=${EMAIL_TRANSPORT:-auto}
+      - EMAIL_API_KEY=${EMAIL_API_KEY:-}
+      - EMAIL_API_PROVIDER=${EMAIL_API_PROVIDER:-resend}
+      - EMAIL_API_URL=${EMAIL_API_URL:-}
       - SMTP_HOST=${SMTP_HOST:-}
       - SMTP_PORT=${SMTP_PORT:-587}
       - SMTP_USER=${SMTP_USER:-}