misc: zot registry, k8s OIDC, server configs, sandbox experiments, and notes

- docker-30/zot: add Zot OCI registry with on-demand sync to docker.io,
  registry.k8s.io, ghcr.io, quay.io
- kubernetes-kvm-terraform: wire Kanidm OIDC via structured
  AuthenticationConfiguration; add reference apiserver manifest and
  join-node-02 helper
- servers: reorganize shadow/ under servers/, add saint vhost config and
  utility-101 VM definition, add shadow hrajfrisbee.cz vhost and
  storage-23 notes
- experiments: add notes and configs for e2b dev VM, kata + firecracker
  on kube, microsandbox, orb-stack k3s (terraform + cloud-init), rke2
- vms/docker: document tailscale + node-exporter setup
- blog: stub post on Gateway API
- chore: gitignore tmp/, smtp_password, and the two local-only
  credential caches; add per-project .claude/settings.json

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

experiments/kata_and_fc_on_kube/manifests/runtime-class_kata-fc.yaml

@@ -0,0 +1,14 @@
+apiVersion: node.k8s.io/v1
+kind: RuntimeClass
+metadata:
+  name: kata-fc
+handler: kata-fc
+scheduling:
+  nodeSelector:
+    # Ensure these pods only land on your specialized node
+    runtime: kata-fc
+  tolerations:
+    - key: "dedicated"
+      operator: "Equal"
+      value: "kata-fc"
+      effect: "NoSchedule"