chore: remove obsolete per-folder scripts, add cookies-cron reference, update docs

- Remove get_cookies.sh (targets a container without yt-dlp, already
  broken), get_cookies_local.sh, start_all.sh/stop_all.sh — these
  implement the old per-service-compose startup that now conflicts
  with the unified root docker-compose.yml.
- Add cookies-cron/ — a reference copy of the scripts actually running
  via cron on the separate browser-equipped machine, with setup
  requirements and instructions for standing up a new cron host.
- Update README.md/ARCHITECTURE.md to describe the current unified
  docker-compose + CI/CD deploy flow and host-mounted cookies instead
  of the old per-folder workflow.

instagram-downloader/get_instagram_cookies.sh

@@ -45,11 +45,8 @@ if [ -f "$COOKIES_FILE" ]; then
         echo "✅ Cookies успешно сохранены в $COOKIES_FILE"
         echo "   Найдено строк с cookies: $COOKIE_LINES"
         echo ""
-        echo "Теперь перезапустите instagram-downloader:"
-        echo "  docker compose -f instagram-downloader/docker-compose.yml restart"
-        echo ""
-        echo "Или перезапустите все сервисы:"
-        echo "  ./stop_all.sh && ./start_all.sh"
+        echo "Если cookies смонтированы с хоста (см. docker-compose.yml/docker-compose.prod.yml),"
+        echo "перезапуск не нужен — yt-dlp читает файл заново при каждом запросе."
     else
         echo ""
         echo "❌ Ошибка: файл cookies создан, но не содержит данных"