feat: initial GitOps infrastructure

ArgoCD app definitions, Kustomize manifests for health-app,
cert-manager ClusterIssuer, and AppProject configuration.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

projects/infinicaretech.yaml

@@ -0,0 +1,24 @@
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: infinicaretech
+  namespace: argocd
+spec:
+  description: InfinicareTech applications
+  sourceRepos:
+    - "https://github.com/infinicaretech/gitops-infra.git"
+  destinations:
+    - namespace: health-app
+      server: https://kubernetes.default.svc
+    - namespace: hera-app
+      server: https://kubernetes.default.svc
+  clusterResourceWhitelist: []
+  namespaceResourceWhitelist:
+    - group: ""
+      kind: "*"
+    - group: apps
+      kind: "*"
+    - group: networking.k8s.io
+      kind: Ingress
+  orphanedResources:
+    warn: true