Add open-webui resource to Kustomization configuration for Noble cluster, enhancing application deployment structure.

clusters/noble/apps/open-webui/values.yaml

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+# Open WebUI — https://github.com/open-webui/helm-charts (chart **open-webui**).
+# Ingress: Traefik + cert-manager (same pattern as **`clusters/noble/apps/homepage/values.yaml`**).
+#
+# After sync: set an OpenAI-compatible API key (**`openaiApiKey`** below or **`openaiApiKeyExistingSecret`**),
+# or enable in-cluster **Ollama** / **Pipelines** in this file. Chart defaults ship a placeholder key — override before use.
+#
+# Optional: protect with ForwardAuth like **`clusters/noble/bootstrap/longhorn/values-authentik-forwardauth.yaml`**.
+#
+ollama:
+  enabled: false
+
+pipelines:
+  enabled: false
+
+# External Ollama (when not using the subchart), e.g. `http://ollama.ollama.svc.cluster.local:11434`
+ollamaUrls: []
+
+ingress:
+  enabled: true
+  class: traefik
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+  host: open-webui.apps.noble.lab.pcenicni.dev
+  additionalHosts: []
+  tls: true
+  existingSecret: ""
+
+enableOpenaiApi: true
+openaiBaseApiUrl: "https://api.openai.com/v1"
+openaiApiKey: ""
+# openaiApiKeyExistingSecret: open-webui-openai
+# openaiApiKeyExistingSecretKey: api-key
+
+persistence:
+  enabled: true
+  size: 5Gi