feat: add Docker support with demo mode and database reset functionality

scripts/docker-entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+# SPDX-FileCopyrightText: 2026 Paul Schoeneck
+#
+# SPDX-License-Identifier: AGPL-3.0-only AND LicenseRef-KIBU-Additional-Terms
+
+set -eu
+node node_modules/tsx/dist/cli.mjs scripts/prepare-container.ts
+exec node node_modules/next/dist/bin/next start --hostname 0.0.0.0 --port "${PORT:-3000}"