Add Russian documentation for UDP handling, backup settings, core settings, discovery settings, geodata, payloads, security, and domain monitoring

- Created UDP documentation detailing traffic handling and filtering options.
- Added backup settings documentation for configuration backup and restoration.
- Introduced core settings documentation covering service management, packet processing, and logging.
- Added discovery settings documentation for automatic configuration detection.
- Created geodata documentation explaining GeoSite and GeoIP databases and their usage.
- Added payloads documentation for generating and managing TLS payloads for faking.
- Introduced security documentation for web interface authorization and HTTPS setup.
- Added domain monitoring documentation for automatic detection of blocked domains and recovery processes.
- Created footer and navbar localization files for Russian language support.

docs/i18n/ru/docusaurus-plugin-content-docs/current/install/docker.md

@@ -0,0 +1,74 @@
+---
+sidebar_position: 6
+title: Docker
+---
+
+# Docker
+
+Образ: [lavrushin/b4](https://hub.docker.com/r/lavrushin/b4) на Docker Hub.
+
+## docker-compose
+
+Создайте файл `docker-compose.yml`:
+
+```yaml
+services:
+  b4:
+    image: lavrushin/b4:latest
+    container_name: b4
+    network_mode: host
+    cap_add:
+      - NET_ADMIN
+      - NET_RAW
+      - SYS_MODULE
+    volumes:
+      - ./config:/etc/b4
+    restart: unless-stopped
+```
+
+Запуск:
+
+```bash
+mkdir -p config
+docker compose up -d
+```
+
+## docker run
+
+```bash
+mkdir -p config
+docker run -d \
+  --name b4 \
+  --network host \
+  --cap-add NET_ADMIN \
+  --cap-add NET_RAW \
+  --cap-add SYS_MODULE \
+  -v ./config:/etc/b4 \
+  --restart unless-stopped \
+  lavrushin/b4:latest
+```
+
+## Параметры
+
+| Параметр | Зачем |
+| --- | --- |
+| `network_mode: host` | b4 работает с сетевым стеком хоста напрямую |
+| `NET_ADMIN` | управление netfilter и правилами firewall |
+| `NET_RAW` | работа с raw-сокетами |
+| `SYS_MODULE` | загрузка модулей ядра (modprobe) |
+| `-v ./config:/etc/b4` | конфигурация сохраняется на хосте |
+
+## Управление
+
+```bash
+docker compose logs -f b4     # логи
+docker compose restart b4     # перезапуск
+docker compose down            # остановка
+docker compose pull && docker compose up -d   # обновление
+```
+
+## Веб-интерфейс
+
+После запуска: `http://localhost:7000`
+
+Порт настраивается в `config/b4.json` (параметр `web_server.port`).