fix(deploy): stage blackbox config + derive bare Grafana SMTP from-address

Two contour-deploy failures from PR4: (1) the deploy did not stage deploy/blackbox/, so
blackbox_exporter crash-looped on a missing config mount — add blackbox to the ci.yaml cp
and the prod-deploy tar; (2) Grafana rejects the 'Name <addr>' From form the backend go-mail
accepts and validates it even when SMTP is disabled, crash-looping Grafana — the deploy now
splits SMTP_RELAY_SERVICE_FROM into a bare GF_SMTP_FROM_ADDRESS + GRAFANA_SMTP_FROM_NAME
(handles both display and bare forms). Verified the sed split + compose render.

deploy/docker-compose.yml

@@ -509,7 +509,9 @@ services:
       GF_SMTP_HOST: ${SMTP_RELAY_HOST:-}:${GRAFANA_SMTP_PORT:-}
       GF_SMTP_USER: ${SMTP_RELAY_USER:-}
       GF_SMTP_PASSWORD: ${SMTP_RELAY_PASS:-}
-      GF_SMTP_FROM_ADDRESS: ${SMTP_RELAY_SERVICE_FROM:-}
+      # A BARE address (Grafana rejects the "Name" <addr> form); the deploy derives it from
+      # SMTP_RELAY_SERVICE_FROM, splitting off the display name into GRAFANA_SMTP_FROM_NAME.
+      GF_SMTP_FROM_ADDRESS: ${GRAFANA_SMTP_FROM_ADDRESS:-}
       GF_SMTP_FROM_NAME: ${GRAFANA_SMTP_FROM_NAME:-Erudit Alerts}
       GF_SMTP_STARTTLS_POLICY: MandatoryStartTLS
       # The alert recipient(s), read by the provisioned contact point via $__env{SERVICE_EMAIL}.