remove Weave GitOps addon

Drop the Flux UI addon and its Tailscale exposure because the UI lags the
current Flux APIs and reports misleading HelmRelease errors. Keep Flux managed
through the controllers themselves and use Rancher or the flux CLI for access.

infrastructure/addons/kustomization-flux-ui.yaml

@@ -1,19 +0,0 @@
-apiVersion: kustomize.toolkit.fluxcd.io/v1
-kind: Kustomization
-metadata:
-  name: addon-flux-ui
-  namespace: flux-system
-spec:
-  interval: 10m
-  prune: true
-  sourceRef:
-    kind: GitRepository
-    name: platform
-  path: ./infrastructure/addons/flux-ui
-  dependsOn:
-    - name: addon-external-secrets
-    - name: addon-tailscale-operator
-    - name: addon-tailscale-proxyclass
-  wait: true
-  timeout: 5m
-  suspend: false