feat: kaskad memo site with Basic Auth

Flask + Docker, header support links, install/uninstall curl scripts, password file or ADMIN_PASSWORD.

Co-authored-by: Cursor <cursoragent@cursor.com>

uninstall.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CONTAINER="${KASKAD_CONTAINER:-kaskad-web-vpn}"
+IMAGE="${KASKAD_IMAGE:-kaskad-web-vpn:latest}"
+
+if docker ps -a --format '{{.Names}}' | grep -qx "$CONTAINER"; then
+  docker rm -f "$CONTAINER"
+  echo "Контейнер ${CONTAINER} удалён."
+else
+  echo "Контейнер ${CONTAINER} не найден."
+fi
+
+if [[ "${REMOVE_IMAGE:-0}" == "1" ]]; then
+  docker rmi "$IMAGE" 2>/dev/null && echo "Образ ${IMAGE} удалён." || echo "Образ ${IMAGE} не найден или занят."
+fi