Add Technitium backup sync automation

technitium-serenity/bin/prepare_pd.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+STACK_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$STACK_DIR"
+
+if [[ ! -f .env ]]; then
+  echo "Missing .env in $STACK_DIR"
+  exit 1
+fi
+
+set -a
+source .env
+set +a
+
+if [[ -z "${LAN_INTERFACE:-}" || -z "${LAN_SUBNET:-}" || -z "${LAN_GATEWAY:-}" || -z "${TECHNITIUM_BIND_IP:-}" || -z "${APPDATA_TECHNITIUM_ROOT:-}" ]]; then
+  echo "LAN_INTERFACE, LAN_SUBNET, LAN_GATEWAY, TECHNITIUM_BIND_IP, and APPDATA_TECHNITIUM_ROOT must be set in .env"
+  exit 1
+fi
+
+sudo mkdir -p "${APPDATA_TECHNITIUM_ROOT}/config" "${APPDATA_TECHNITIUM_ROOT}/logs"
+
+echo "Validating compose config"
+sudo docker compose --env-file .env config >/tmp/technitium-pilot-compose.rendered.yaml
+
+echo "Rendered compose saved to /tmp/technitium-pilot-compose.rendered.yaml"
+
+if [[ "${1:-}" == "--up" ]]; then
+  echo "Starting Technitium pilot"
+  sudo docker compose --env-file .env up -d
+fi