Initial commit: HTTP wrapper around the existing falah-ibaas email connector

Gives Supabase Edge Functions (and anything else outside the VPS) a real,
authenticated endpoint onto the VPS's already-working internal Postfix
relay (the same one Ghost uses in production), via the falah-ibaas
EmailConnector that was fully built but never actually deployed.

Deployed live at https://nfmailrelay.falahos.my as a Docker Swarm service
on the existing Traefik network, TLS via Let's Encrypt, shared-secret
bearer auth. Built for Nur Falah's heir notification emails.

Dockerfile

@@ -0,0 +1,8 @@
+FROM python:3.12-slim
+WORKDIR /app
+COPY relay.py .
+ENV PORT=8091
+EXPOSE 8091
+# The falah-ibaas email connector (handler.py) is bind-mounted at
+# /opt/falah-ibaas/connectors/email at runtime — see docker service create.
+CMD ["python3", "relay.py"]