init: initial commit

- ticker / QR ad overlay / break slide graphics (1920×1080) with all
  geometry derived from one shared module (src/shared/obs-geometry.mjs)
- OBS scene-collection generator (scripts/generate-obs-scenes.mjs) and a
  read-only in-dashboard setup verifier, both driven by the same module
- en/sr dashboard i18n selected via bundle config; configschema.json with
  neutral first-run defaults seeded from optional branding config
- install.sh / systemd user service / update.sh for venue deployment
- reference OBS scene collection + profile from a real venue as fixtures

scripts/install-service.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# Install and enable the systemd user service for a NodeCG install created
+# by install.sh.
+#
+# Usage: ./install-service.sh [install-dir]   (default: ~/venue-gfx)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+UNIT_NAME=nodecg-venue-gfx.service
+TEMPLATE="$SCRIPT_DIR/../deploy/$UNIT_NAME"
+
+install_dir="${1:-$HOME/venue-gfx}"
+install_dir="$(cd "${install_dir/#\~/$HOME}" && pwd)"
+
+[[ -f $install_dir/index.js ]] || {
+  echo "$install_dir does not look like a NodeCG install (no index.js)" >&2
+  exit 1
+}
+
+mkdir -p "$HOME/.config/systemd/user"
+sed "s|__INSTALL_DIR__|$install_dir|" "$TEMPLATE" \
+  > "$HOME/.config/systemd/user/$UNIT_NAME"
+
+systemctl --user daemon-reload
+systemctl --user enable --now "$UNIT_NAME"
+systemctl --user status "$UNIT_NAME" --no-pager || true
+
+cat <<EOF
+
+Service installed and started. Useful commands:
+  systemctl --user status  $UNIT_NAME
+  systemctl --user restart $UNIT_NAME
+  journalctl --user -u $UNIT_NAME -f
+
+⚠ To start on boot without anyone logging in, lingering must be enabled once:
+  loginctl enable-linger $USER
+EOF