Настройка запуска на Ubuntu + tmux и доступ извне (Арсен.)

- Добавлены инструкции `docs/UBUNTU_SETUP.md` и секции в README.
- Добавлены скрипты `scripts/setup-postgres-ubuntu.sh` и `scripts/start-tmux.sh` (tmux: front/back).
- Для доступа снаружи: Vite `allowedHosts: true`, бэкенд слушает `0.0.0.0`.
- Добавлен сид демо-пользователя портала `demo` / `demo123` с ролью DIRECTOR (как `its`).
- `.env` файлы добавлены в `.gitignore`, чтобы не коммитить секреты.

Выполнил: Арсен.

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

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