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/ansible.cfg

@@ -0,0 +1,14 @@
+[defaults]
+inventory = inventory/hosts.yaml
+roles_path = roles
+remote_user = julia
+private_key_file = ~/.ssh/homelab
+host_key_checking = False
+retry_files_enabled = False
+stdout_callback = yaml
+callbacks_enabled = profile_tasks
+
+[privilege_escalation]
+become = True
+become_method = sudo
+become_user = root