feat(panel): serve authenticated app on dedicated panel subdomain

Separate the marketing landing site from the authenticated app by host.
Next.js middleware reads PANEL_HOST/LANDING_HOST at runtime and redirects
authenticated routes (/dashboard, /login, /register) from the landing host
to the panel host, and the landing root on the panel host to /dashboard.
Disabled (single-origin) when PANEL_HOST is unset, so local dev is unchanged.

Helm: add ingress.panel.host with a third ingress rule + TLS host routing to
the frontend service, pass LANDING_HOST/PANEL_HOST to the frontend, and append
the panel origin to the backend CORS list (frontend URL stays first so
PLATFORM_DOMAIN resolution is unaffected).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/helm/cloudhost-platform/templates/_helpers.tpl

@@ -74,6 +74,21 @@ app.kubernetes.io/instance: {{ .Release.Name }}
 {{- end }}
 {{- end }}
 
+{{- /*
+Comma-separated CORS origins for the backend's FRONTEND_URL.
+The frontend (landing) URL MUST stay first: configuration.ts derives
+PLATFORM_DOMAIN / preview domain from the first entry only. The panel host
+(when configured) is appended as an additional allowed origin.
+*/ -}}
+{{- define "cloudhost-platform.corsOrigins" -}}
+{{- $scheme := include "cloudhost-platform.urlScheme" . -}}
+{{- $origins := list (include "cloudhost-platform.frontendPublicUrl" .) -}}
+{{- if and .Values.ingress.enabled .Values.ingress.panel.host -}}
+{{- $origins = append $origins (printf "%s://%s" $scheme .Values.ingress.panel.host) -}}
+{{- end -}}
+{{- join "," $origins -}}
+{{- end }}
+
 {{- define "cloudhost-platform.apiPublicUrl" -}}
 {{- $scheme := include "cloudhost-platform.urlScheme" . -}}
 {{- if .Values.ingress.enabled }}

backend/helm/cloudhost-platform/templates/backend-deployment.yaml

@@ -79,7 +79,7 @@ spec:
                   name: {{ include "cloudhost-platform.secretName" . }}
                   key: jwt-refresh-secret
             - name: FRONTEND_URL
-              value: {{ include "cloudhost-platform.frontendPublicUrl" . | quote }}
+              value: {{ include "cloudhost-platform.corsOrigins" . | quote }}
             {{- range $key, $val := .Values.backend.env }}
             - name: {{ $key }}
               value: {{ $val | quote }}

backend/helm/cloudhost-platform/templates/frontend-deployment.yaml

@@ -28,6 +28,14 @@ spec:
               value: "3000"
             - name: HOSTNAME
               value: "0.0.0.0"
+            {{- if .Values.ingress.panel.host }}
+            # Host-based separation: landing on frontend.host, authenticated
+            # panel on panel.host. Read by Next.js middleware at runtime.
+            - name: LANDING_HOST
+              value: {{ .Values.ingress.frontend.host | quote }}
+            - name: PANEL_HOST
+              value: {{ .Values.ingress.panel.host | quote }}
+            {{- end }}
           livenessProbe:
             httpGet:
               path: /

backend/helm/cloudhost-platform/templates/ingress.yaml

@@ -25,6 +25,9 @@ spec:
         - {{ .Values.ingress.singleHost.host | quote }}
         {{- else }}
         - {{ .Values.ingress.frontend.host | quote }}
+        {{- if .Values.ingress.panel.host }}
+        - {{ .Values.ingress.panel.host | quote }}
+        {{- end }}
         - {{ .Values.ingress.api.host | quote }}
         {{- end }}
       secretName: {{ include "cloudhost-platform.tlsSecretName" . }}
@@ -59,6 +62,18 @@ spec:
                 name: {{ include "cloudhost-platform.frontend.fullname" . }}
                 port:
                   number: 3000
+    {{- if .Values.ingress.panel.host }}
+    - host: {{ .Values.ingress.panel.host | quote }}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ include "cloudhost-platform.frontend.fullname" . }}
+                port:
+                  number: 3000
+    {{- end }}
     - host: {{ .Values.ingress.api.host | quote }}
       http:
         paths:

backend/helm/cloudhost-platform/values.yaml

@@ -78,6 +78,10 @@ ingress:
   className: nginx
   frontend:
     host: platform.cloudhost.local
+  # Optional dedicated host for the authenticated panel. Empty = disabled
+  # (single-origin, dev). Production (abrban): panel.abrban.com
+  panel:
+    host: ""
   api:
     host: api.cloudhost.local
   singleHost: