Add ArgoCD insecure mode configuration

- Configure ArgoCD to run in HTTP mode behind HTTPS Ingress
- Required for proper TLS termination at Ingress level
- Ensures ArgoCD works correctly with cert-manager certificates

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

manifests/07-argocd-insecure-config.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: argocd-cmd-params-cm
+  namespace: argocd
+data:
+  # Run ArgoCD server in insecure mode (HTTP) behind HTTPS Ingress
+  server.insecure: "true"