feat: add Umami analytics deployment

Deploys Umami with PostgreSQL backend, Traefik ingress, cert-manager
TLS, and ArgoCD GitOps pattern matching existing services.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

umami/argocd-app.yaml

@@ -0,0 +1,28 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: umami
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://git.chemavx.xyz/chemavx/k8s-manifests
+    targetRevision: HEAD
+    path: umami
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: umami
+  ignoreDifferences:
+    - group: ""
+      kind: Secret
+      name: umami-secrets
+      namespace: umami
+      jsonPointers:
+        - /data
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - RespectIgnoreDifferences=true