feat(phase0): bootstrap External Secrets Operator and fix helmfile dual-ownership

Phase 0 groundwork for helmfile→ArgoCD migration:

1. Remove 3 bootstrap releases from helmfile (cert-manager, reloader, ingress-nginx)
   — already managed by terraform/bootstrap-releases.tf; eliminates dual-ownership

2. Bootstrap ESO (External Secrets Operator) as TF-managed release
   — required for all ExternalSecret resources in phases 1-3
   — added to bootstrap-releases.tf + helm-repositories.tf

3. Create ClusterSecretStore connecting ESO to Vault (K8s auth)
   — enables per-namespace/per-release secret injection
   — vault config documented in docs/PHASE0-ESO-VAULT-SETUP.md (manual setup)

4. Fix argocd-bootstrap.tf CA cert copy: use jq instead of sed for cleaner metadata handling

Changes:
- helmfile.yaml.gotmpl: remove cert-manager/reloader/ingress-nginx blocks
- terraform/bootstrap-releases.tf: add external-secrets release
- terraform/helm-repositories.tf: add external-secrets Helm repo
- k8s/external-secrets/clustersecretstore.yaml: ESO→Vault ClusterSecretStore
- k8s/argocd/apps/0-wave-0.yaml: stub wave 0 applications (schema fix, rewrite pending Phase 1)
- docs/PHASE0-ESO-VAULT-SETUP.md: manual ESO-Vault auth setup procedure

Next: Phase 1 will incrementally rewrite ArgoCD Applications + migrate helmfile releases.

Co-Authored-By: Claude Haiku 4.5 <[email protected]>

k8s/argocd/apps/0-wave-0.yaml

@@ -0,0 +1,83 @@
+# Wave 0 — Parallel bootstrap: storage, messaging, and monitoring operators
+# No inter-dependencies; these provide foundational infrastructure.
+
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: strimzi-operator
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "0"
+spec:
+  project: homelab
+  source:
+    repoURL: https://strimzi.io/charts/
+    chart: strimzi-kafka-operator
+    targetRevision: 0.46.0
+    helm:
+      values: |
+        watchNamespaces: ["sqs"]
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: sqs
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: kmsvc-redis
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "0"
+spec:
+  project: homelab
+  source:
+    repoURL: https://charts.bitnami.com/bitnami
+    chart: redis
+    targetRevision: 20.6.0
+    helm:
+      valueFiles:
+        - k8s/sqs/redis-values.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: sqs
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: prometheus
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "0"
+spec:
+  project: homelab
+  source:
+    repoURL: https://prometheus-community.github.io/helm-charts
+    chart: kube-prometheus-stack
+    targetRevision: latest
+    helm:
+      valueFiles:
+        - k8s/monitoring/prometheus-values.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: monitoring
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true