fix argocd install + add root bootstrap Application manifest

- remove server.httproute from argocd values.yaml: helm install failed
  since Gateway API CRDs (installed by envoy-gateway, wave 2) don't
  exist yet; HTTPRoute is already applied manually in Phase 6
- add bootstrap-app.yaml as the Git-committed root/seed Application,
  replacing ad-hoc UI creation (GitOps anti-pattern: apps not stored
  in Git can't be recreated)

bootstrap-app.yaml

@@ -0,0 +1,18 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: bootstrap
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://gitea.fireflylab.cc/duynguyen/cluster-bootstrap.git
+    targetRevision: main
+    path: bootstrap/apps
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: argocd
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true