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

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "homelab",
+  "private": true,
+  "scripts": {
+    "build": "turbo build",
+    "dev": "turbo dev",
+    "lint": "turbo lint",
+    "test": "turbo test",
+    "format": "prettier --write \"**/*.{ts,tsx,js,jsx,json,md,yaml,yml}\""
+  },
+  "devDependencies": {
+    "prettier": "^3.2.5",
+    "turbo": "^2.4.0"
+  },
+  "packageManager": "pnpm@9.15.4",
+  "engines": {
+    "node": ">=20"
+  }
+}