Initial monorepo scaffold

Turborepo + pnpm monorepo for k3s homelab cluster on Intel NUCs.

- Apps: Next.js web frontend, Express API (TypeScript, Dockerfiles, k8s manifests)
- Packages: shared UI, ESLint config, TypeScript config, Drizzle DB schemas
- Infra/Ansible: bare-metal provisioning with roles for common, k3s-server, k3s-agent, hardening
- Infra/Kubernetes: ArgoCD GitOps (app-of-apps + ApplicationSets), platform components
  (cert-manager, Traefik, CloudNativePG, Valkey, Longhorn, Sealed Secrets), namespaces
- Observability: kube-prometheus-stack, Loki, Promtail as ArgoCD Applications
- CI/CD: GitHub Actions for PR builds, preview deploys, production deploys
- DX: Taskfile, utility scripts, copier templates, Ubiquiti network docs

apps/api/k8s/overlays/preview/kustomization.yaml

@@ -0,0 +1,25 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../base
+patches:
+  - target:
+      kind: Deployment
+      name: api
+    patch: |
+      apiVersion: apps/v1
+      kind: Deployment
+      metadata:
+        name: api
+      spec:
+        replicas: 1
+  - target:
+      kind: Ingress
+      name: api
+    patch: |
+      - op: replace
+        path: /spec/rules/0/host
+        value: api-preview.homelab.local
+      - op: replace
+        path: /spec/tls/0/hosts/0
+        value: api-preview.homelab.local