fix: Pass Subdomains field through to HAProxy InstanceRoute

The reconciliation was building InstanceRoutes without setting the
Subdomains field, so all services were exact-match only — breaking
wildcard subdomain routing for *.cloud.payne.io and *.cloud2.payne.io.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/api/v1/helpers.go

@@ -44,6 +44,7 @@ func (api *API) reconcileNetworking() {
 				Name:       svc.Domain,
 				Domain:     svc.Domain,
 				BackendIP:  extractHost(svc.Backend.Address),
+				Subdomains: svc.Subdomains,
 			})
 		case services.BackendHTTP:
 			httpRoutes = append(httpRoutes, haproxy.HTTPRoute{