Migrate k8s config from Terraform to Argo CD + ESO

Phase 1: Install External Secrets Operator via Argo CD app
- apps/external-secrets.yaml — ESO Helm chart install
- apps/external-secrets-config.yaml — ClusterSecretStore deployment
- k8s/external-secrets/cluster-secret-store.yaml — Vault backend using vault-token Secret

Phase 2: Create k8s manifests for all services
- k8s/neuron/ — PVC, ConfigMap, ExternalSecrets (neuron-secrets, cloudflared-secret), Ingress
- k8s/gitea/ — PVC, ConfigMap (custom CSS), ExternalSecret (gitea-db), Ingress
- k8s/github-runner/ — ExternalSecret (github-runner-secret)
- k8s/gitea-runner/ — ExternalSecret (gitea-runner-secret)
- k8s/monitoring/ — ExternalSecrets (grafana, slack), Alloy OTLP service+middleware, datasources ConfigMap, Ingress
- k8s/postgres/ — ExternalSecret (postgres-passwords)
- k8s/vault/ — ExternalSecret (vault-gcp-sa from Vault)
- k8s/adguard/ — PVCs, ConfigMap, Certificate, Ingress, ddclient Deployment+ExternalSecret
- k8s/ollama/ — PVC, Ingress
- k8s/headscale/ — PVC
- k8s/packages/ — PVCs, ConfigMap, Ingresses
- k8s/registry/ — PVC, Ingresses
- k8s/backup/ — CronJob, ExternalSecret (backup-credentials)

New Argo CD apps for Helm releases:
- apps/kube-prometheus-stack.yaml, loki.yaml, tempo.yaml, alloy.yaml
- apps/postgres.yaml, redis.yaml, vault.yaml

New Argo CD apps for k8s config paths:
- apps/neuron-config, gitea-config, ci-config, gitea-runner-config
- apps/monitoring-config, adguard-config, ollama-config, headscale-config
- apps/packages-config, registry-config, postgres-config, vault-config, backup

Phase 3: Strip Terraform to infrastructure-only
- All kubernetes_* and helm_release resources removed from service .tf files
- Each service .tf now contains only kubernetes_namespace (bootstrap dependency)
- variables.tf stripped to only cloudflare_api_key, cloudflare_email, gitea_api_token
- namespaces.tf gains external-secrets namespace
- ingress.tf, backup.tf, ddclient.tf emptied (resources in k8s/)
- cert-manager.tf, argocd.tf, traefik.tf unchanged (bootstrap)

servers/legion/k8s/packages/configmap.yaml

@@ -0,0 +1,32 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: verdaccio-config
+  namespace: packages
+data:
+  config.yaml: |
+    storage: /verdaccio/storage
+    auth:
+      htpasswd:
+        file: /verdaccio/storage/htpasswd
+        max_users: 1
+    uplinks:
+      npmjs:
+        url: https://registry.npmjs.org/
+        cache: true
+    packages:
+      '@harmonic-framework/*':
+        access: $authenticated
+        publish: $authenticated
+        unpublish: $authenticated
+      '**':
+        access: $all
+        publish: $authenticated
+        proxy: npmjs
+    listen: 0.0.0.0:4873
+    server:
+      keepAliveTimeout: 60
+    log:
+      type: stdout
+      format: pretty
+      level: http

servers/legion/k8s/packages/ingress.yaml

@@ -0,0 +1,54 @@
+---
+# npm registry — Verdaccio
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: npm-registry
+  namespace: packages
+  annotations:
+    traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+spec:
+  ingressClassName: traefik
+  tls:
+    - hosts:
+        - npm.neuralplatform.ai
+      secretName: npm-registry-tls
+  rules:
+    - host: npm.neuralplatform.ai
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: verdaccio
+                port:
+                  number: 4873
+---
+# PyPI registry — devpi
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: pypi-registry
+  namespace: packages
+  annotations:
+    traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+spec:
+  ingressClassName: traefik
+  tls:
+    - hosts:
+        - pypi.neuralplatform.ai
+      secretName: pypi-registry-tls
+  rules:
+    - host: pypi.neuralplatform.ai
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: devpi
+                port:
+                  number: 3141

servers/legion/k8s/packages/pvc.yaml

@@ -0,0 +1,24 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: verdaccio-data
+  namespace: packages
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: devpi-data
+  namespace: packages
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi