Services often need their own public origin — the URL a browser loads them
at through the gateway — to populate CORS/WebSocket/secure-context allowlists.
Previously this had to be hardcoded in the app's own config, which silently
broke when the subdomain-routing migration changed the address (openclaw's
Control UI rejected its new origin).
${public_url} resolves at deploy to the service's gateway-facing base URL:
https://<name>.<gateway.domain> when exposed under tls: acme, else the
node-local http://localhost:<port>. It tracks gateway.domain, so a domain
change needs no per-app edit. Jobs (not exposed) don't get it.
Matches the TLS mode as the raw lowercased string == "acme", the same way the
Caddyfile generator does (the TLSMode enum is stale).
Paul Payne
c28198dab6