Bring nearle stack and routing manifests under Flux management

- manifests/core/kustomization.yaml: add ingress-unified.yaml and
  traefik-middlewares.yaml, which were never in any kustomization and so
  were never actually GitOps-managed - the queue.workolik.com routing fix
  from c38a367 turned out to be live already (likely applied manually
  before this session), but was completely undetected by Flux until now.
  Dropped the redundant top-level `namespace: core` override since every
  existing resource already sets its own namespace explicitly, and the
  two new files span alaska/nearle.
- manifests/nearle/kustomization.yaml + clusters/production/apps-nearle.yaml:
  same GitOps treatment already applied to alaska/core, so a fiesta/jupiter/
  atlantis/titan/ariane version bump in git now auto-deploys instead of
  requiring manual kubectl apply.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

clusters/production/apps-nearle.yaml

@@ -0,0 +1,14 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: nearle
+  namespace: flux-system
+spec:
+  interval: 10m
+  sourceRef:
+    kind: GitRepository
+    name: flux-system
+  path: ./manifests/nearle
+  prune: true
+  wait: true
+  timeout: 5m