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/kubernetes/observability/promtail/application.yaml

@@ -0,0 +1,38 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: promtail
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://grafana.github.io/helm-charts
+    chart: promtail
+    targetRevision: 6.16.6
+    helm:
+      valuesObject:
+        config:
+          clients:
+            - url: http://loki.observability.svc:3100/loki/api/v1/push
+          snippets:
+            pipelineStages:
+              - cri: {}
+              - multiline:
+                  firstline: '^\d{4}-\d{2}-\d{2}'
+                  max_wait_time: 3s
+        resources:
+          requests:
+            memory: 64Mi
+            cpu: 50m
+          limits:
+            memory: 256Mi
+        tolerations:
+          - effect: NoSchedule
+            operator: Exists
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: observability
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true