Establish clean homelab infrastructure baseline

Reorganize the brownfield repository, remove retired and generated artifacts, harden ignore rules, and record the GitOps/IaC redesign.

platform/observability/grafana/dashboards/apply.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Load every *.json in this folder into Grafana as a sidecar dashboard ConfigMap.
+# The Grafana chart's dashboard sidecar (sidecar.dashboards.enabled) watches for
+# ConfigMaps labeled grafana_dashboard=1 in the monitoring namespace and imports them.
+# Idempotent — re-run after adding/updating a dashboard JSON.
+#
+# The VictoriaMetrics board uses a `$ds` datasource variable that resolves to the
+# default datasource (VictoriaMetrics), so no per-panel rewiring is needed.
+set -euo pipefail
+cd "$(dirname "$0")"
+
+NS=monitoring
+for f in *.json; do
+  [ -e "$f" ] || continue
+  name="grafana-dashboard-$(basename "$f" .json)"
+  echo "applying $name from $f"
+  kubectl create configmap "$name" \
+    --namespace "$NS" \
+    --from-file="$f" \
+    --dry-run=client -o yaml \
+  | kubectl label --local -f - grafana_dashboard=1 --dry-run=client -o yaml \
+  | kubectl apply -f -
+done