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

docs/zh/quickstart.md

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+# BaraDB - 快速入门指南
+
+## 启动服务器
+
+构建 BaraDB 后，启动服务器:
+
+```bash
+./build/baradadb
+```
+
+服务器默认在 `localhost:9470` 上启动。
+
+## 通过 CLI 连接
+
+BaraDB 包含一个交互式 shell:
+
+```bash
+./build/baradadb --shell
+```
+
+## 基本操作
+
+### 创建模式
+
+```sql
+CREATE TYPE Person {
+  name: str,
+  age: int32
+};
+
+CREATE TYPE Movie {
+  title: str,
+  year: int32,
+  director: Person
+};
+```
+
+### 插入数据
+
+```sql
+INSERT Person { name := 'Alice', age := 30 };
+INSERT Person { name := 'Bob', age := 25 };
+```
+
+### 查询数据
+
+```sql
+SELECT name, age FROM Person WHERE age > 18;
+```
+
+### 更新数据
+
+```sql
+UPDATE Person SET age = 31 WHERE name = 'Alice';
+```
+
+### 删除数据
+
+```sql
+DELETE FROM Person WHERE name = 'Bob';
+```
+
+## 高级查询
+
+### JOIN
+
+```sql
+SELECT u.name, o.total
+FROM users u
+INNER JOIN orders o ON u.id = o.user_id;
+```
+
+### 聚合
+
+```sql
+SELECT department, count(*), avg(salary)
+FROM employees
+GROUP BY department
+HAVING count(*) > 5;
+```
+
+### CTE (公共表表达式)
+
+```sql
+WITH active_users AS (
+  SELECT * FROM users WHERE active = true
+)
+SELECT * FROM active_users;
+```
+
+## 向量搜索
+
+```sql
+-- 插入向量
+INSERT vectors { id := 1, embedding := [0.1, 0.2, 0.3] };
+
+-- 搜索相似
+SELECT * FROM vectors ORDER BY cosine_distance(embedding, [0.1, 0.2, 0.3]) LIMIT 10;
+```
+
+## 图操作
+
+```sql
+-- 匹配图模式
+MATCH (p:Person)-[:KNOWS]->(other:Person)
+WHERE p.name = 'Alice'
+RETURN other.name;
+```
+
+## 全文搜索
+
+```sql
+-- 搜索文档
+SELECT * FROM articles WHERE MATCH(title, body) AGAINST('database');
+```
+
+## HTTP/REST API
+
+```bash
+# GET 请求
+curl http://localhost:9470/api/users
+
+# POST 请求
+curl -X POST http://localhost:9470/api/users \
+  -H "Content-Type: application/json" \
+  -d '{"name": "Alice", "age": 30}'
+```
+
+## 下一步
+
+- [BaraQL 参考](baraql.md)
+- [存储引擎](storage.md)
+- [架构概述](architecture.md)
+- [协议参考](protocol.md)