docs: add multi-language documentation (ru, fa, zh, tr, ar)

docs/ru/api-websocket.md

@@ -0,0 +1,80 @@
+# WebSocket API
+
+Полнодуплексная потоковая передача для real-time лент данных и push-уведомлений.
+
+## Подключение
+
+```
+ws://localhost:9471/ws
+```
+
+## Пример клиента
+
+```javascript
+const ws = new WebSocket('ws://localhost:9471/ws');
+
+ws.onopen = () => {
+  console.log('Connected');
+  ws.send(JSON.stringify({
+    type: 'query',
+    sql: 'SELECT * FROM users'
+  }));
+};
+
+ws.onmessage = (event) => {
+  const data = JSON.parse(event.data);
+  console.log('Received:', data);
+};
+```
+
+## Формат сообщения
+
+```json
+{
+  "type": "query",
+  "id": "uuid",
+  "sql": "SELECT * FROM users"
+}
+```
+
+## Типы сообщений
+
+### Запрос
+
+```json
+{
+  "type": "query",
+  "id": "123",
+  "sql": "SELECT * FROM users"
+}
+```
+
+### Ответ
+
+```json
+{
+  "type": "result",
+  "id": "123",
+  "data": [{"id": 1, "name": "Alice"}]
+}
+```
+
+### Подписка
+
+```json
+{
+  "type": "subscribe",
+  "table": "users"
+}
+```
+
+### Push уведомление
+
+```json
+{
+  "type": "push",
+  "table": "users",
+  "action": "insert",
+  "data": {"id": 3, "name": "Charlie"}
+}
+```