add fornax-ui Argo CD application

Deploys fornax/ui:latest (nginx serving React SPA) to the media
namespace. Image is now pushed by the fornax CI pipeline.

servers/legion/apps/fornax.yaml

@@ -64,6 +64,28 @@ spec:
     syncOptions:
       - CreateNamespace=true
 ---
+# Fornax UI — React SPA served by nginx
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: fornax-ui
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: http://10.43.1.53:3000/will/infrastructure.git
+    targetRevision: main
+    path: servers/legion/k8s/fornax/ui
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: media
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+---
 # Fornax Grafana dashboard — auto-discovered by Grafana sidecar (grafana_dashboard=1)
 apiVersion: argoproj.io/v1alpha1
 kind: Application