chore(scripts): add compose, k3s, backup, and media helpers

Automate image load, Helm install, database backup, and sample video regeneration.

scripts/k3s-load-images.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Build compose images and import them into local k3s containerd.
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$ROOT"
+
+if ! command -v k3s >/dev/null 2>&1; then
+  echo "k3s not found. Install: https://docs.k3s.io/quick-start" >&2
+  exit 1
+fi
+
+./scripts/compose-dev.sh build backend frontend
+
+echo "Importing images into k3s..."
+docker save pargar-backend:local pargar-frontend:local | sudo k3s ctr images import -
+echo "Done. Images: pargar-backend:local pargar-frontend:local"