launch: deploy daemon StatefulSet, fix neuron-rest security context, add daemon Argo CD app

- Add neuron-daemon Argo CD Application (apps/neuron-daemon.yaml) pointing to
  k8s/neuron-technologies/daemon/ on main — daemon will deploy once image is built
- Add daemon k8s manifests: StatefulSet (2 replicas, imagePullPolicy: Always),
  Service (ClusterIP :7749, session affinity), ExternalSecret (Anthropic API key from Vault)
- Fix neuron-rest runAsNonRoot: remove constraint since v0.15.3 image runs as root,
  clears the CreateContainerConfigError on the 11h-old stale pod
- Add NEURON_DAEMON_WS_URL env var to marketing deployment for chat UI connectivity
- Add neuron.neurontechnologies.ai Cloudflare DNS record and tunnel ingress rule (Terraform)

servers/legion/apps/neuron-daemon.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: neuron-daemon
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: http://10.43.1.53:3000/will/infrastructure.git
+    targetRevision: main
+    path: servers/legion/k8s/neuron-technologies/daemon
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: neuron-prod
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=false