feat: organize Grafana dashboards into folders
Enable sidecar folderAnnotation + foldersFromFilesStructure to group
26 dashboards into 5 managed folders:
- Cluster (6): k8s health, API server, nodes, pods, kube-state-metrics
- Networking (6): CoreDNS, Technitium, Headscale, ingress, network traffic
- Hardware (5): node-exporter, proxmox, iDRAC, UPS, NVIDIA GPU
- Operations (4): backup health, registry, audit logs, Loki
- Applications (2): realestate-crawler, qBittorrent
Dashboard-to-folder mapping defined in grafana.tf locals block.
External stacks (headscale, technitium) annotated individually.
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