Update documentation and clients for v1.1.0

Documentation updates:
- Fix v0.1.0 → v1.1.0 version numbers in en, ru, fa, zh docs
- Add missing Window Functions, Multi-Tenant ERP, Supported Keywords sections
  to ru, fa, zh baraql.md (~105 lines each)
- Expand Turkish and Arabic baraql.md (110 → 268 lines)
- Expand Turkish and Arabic installation.md (62 → 307 lines)
- Add new Bulgarian documentation files (18 new files)

Client updates:
- Python: Full async/await rewrite with asyncio, request queueing
- Rust: Full async/await rewrite with tokio, async examples
- Nim: Update README to v1.1.0
- All clients now support async patterns consistently

docs/bg/columnar.md

@@ -0,0 +1,58 @@
+# Колонково Съхранение (Columnar)
+
+Колонково-ориентирано съхранение за аналитични заявки и агрегации.
+
+## Употреба
+
+```nim
+import barabadb/core/columnar
+
+var batch = newColumnBatch()
+var ageCol = batch.addInt64Col("age")
+var nameCol = batch.addStringCol("name")
+
+ageCol.appendInt64(25)
+nameCol.appendString("Alice")
+```
+
+## Агрегации
+
+```nim
+echo ageCol.sumInt64()
+echo ageCol.avgInt64()
+echo ageCol.minInt64()
+echo ageCol.maxInt64()
+echo ageCol.count()
+```
+
+## Кодиране
+
+### RLE (Run-Length Encoding)
+
+```nim
+let rle = rleEncode(@[1'i64, 1, 1, 2, 2, 3])
+```
+
+### Dictionary Encoding
+
+```nim
+let dict = dictEncode(@["apple", "banana", "apple"])
+```
+
+## Типове Колони
+
+| Тип | Описание |
+|------|----------|
+| `int32` | 32-битов integer |
+| `int64` | 64-битов integer |
+| `float32` | 32-битов float |
+| `float64` | 64-битов float |
+| `string` | Низ с променлива дължина |
+| `bool` | Булев |
+
+## Случаи на Употреба
+
+- OLAP натоварвания
+- Мащабни агрегации
+- Data warehousing
+- Анализ на времеви редове