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

turbo.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "globalDependencies": ["**/.env.*local"],
+  "tasks": {
+    "build": {
+      "dependsOn": ["^build"],
+      "outputs": [".next/**", "!.next/cache/**", "dist/**"]
+    },
+    "lint": {
+      "dependsOn": ["^build"]
+    },
+    "dev": {
+      "cache": false,
+      "persistent": true
+    },
+    "test": {
+      "dependsOn": ["^build"]
+    }
+  }
+}