Add Flux GitOps bootstrap for minikube

Set up a complete GitOps pipeline using Flux CD to manage a minikube
cluster. Includes bootstrap script, Traefik ingress controller via
HelmRelease, and a hello-world nginx deployment.

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

apps/nginx-hello/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: nginx-hello