fix(email): correct Reply-To header shape for listmonk (was silently dropped)

Listmonk applies campaign headers as `for hdr,val := range set { h.Add(hdr,val) }`
(internal/manager/manager.go v6.1.0): each map's KEY is the literal header name.
The trucking/CRTC/deficiency builders wrote {"name":"Reply-To","value":..} (and
{"key":..,"value":..}), which emits junk `name:`/`value:` headers and NO real
Reply-To, so replies fell back to the From address (noreply@send.performancewest.net)
instead of info@performancewest.net. HC builder already used the correct
{"Reply-To": value} shape; match it everywhere. Verified against listmonk source.

Impact: outbound only; no customer replies were lost (noreply@ is a real mailbox),
but reply UX pointed at a no-reply address. Live campaign headers re-patched separately.

scripts/workers/create_compliance_campaign.py

@@ -251,7 +251,7 @@ def create_campaign():
         "content_type": "html",
         "body": campaign_html,
         "status": "draft",
-        "headers": [{"key": "Reply-To", "value": "info@performancewest.net"}],
+        "headers": [{"Reply-To": "info@performancewest.net"}],
     }, timeout=30)
 
     if not r.ok: