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

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# B-Tree 索引
用于高效范围扫描和点查询的有序索引结构。
## 用法
```nim
import barabadb/storage/btree
var btree = newBTreeIndex[string, string]()
btree.insert("key1", "value1")
btree.insert("key2", "value2")
let values = btree.get("key1")
let range = btree.scan("key_a", "key_z")
btree.delete("key1")
```
## 特性
- 有序键值存储
- 范围查询(BETWEEN, >, <, >=, <=
- 前缀扫描
- 可配置的页面大小
- 迭代器支持