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

infra/ansible/playbooks/site.yaml

@@ -0,0 +1,9 @@
+---
+- name: Full cluster deployment
+  ansible.builtin.import_playbook: bootstrap.yaml
+
+- name: Install k3s servers
+  ansible.builtin.import_playbook: k3s-server.yaml
+
+- name: Install k3s agents
+  ansible.builtin.import_playbook: k3s-agent.yaml