Update dashboard manifests and add automation

- Updated deployment with correct Pi 3 tolerations
- Updated ingress for cloudflare-tunnel
- Added crontab example for systemd alternative
- Updated go.sum

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

dashboard/deploy/kustomization.yaml

@@ -15,5 +15,5 @@ commonLabels:
   app.kubernetes.io/managed-by: argocd
 
 images:
-  - name: ghcr.io/will/k8s-agent-dashboard
+  - name: gitea-http.taildb3494.ts.net/will/k8s-agent-dashboard
     newTag: latest