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

docs/zh/api-websocket.md

@@ -0,0 +1,67 @@
+# WebSocket API
+
+用于实时数据流和推送通知的全双工流。
+
+## 连接
+
+```
+ws://localhost:9471/ws
+```
+
+## 客户端示例
+
+```javascript
+const ws = new WebSocket('ws://localhost:9471/ws');
+
+ws.onopen = () => {
+  ws.send(JSON.stringify({
+    type: 'query',
+    sql: 'SELECT * FROM users'
+  }));
+};
+
+ws.onmessage = (event) => {
+  console.log('Received:', JSON.parse(event.data));
+};
+```
+
+## 消息格式
+
+```json
+{
+  "type": "query",
+  "id": "uuid",
+  "sql": "SELECT * FROM users"
+}
+```
+
+## 消息类型
+
+### 查询请求
+
+```json
+{
+  "type": "query",
+  "id": "123",
+  "sql": "SELECT * FROM users"
+}
+```
+
+### 查询响应
+
+```json
+{
+  "type": "result",
+  "id": "123",
+  "data": [{"id": 1, "name": "Alice"}]
+}
+```
+
+### 订阅
+
+```json
+{
+  "type": "subscribe",
+  "table": "users"
+}
+```