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/api-http.md

@@ -0,0 +1,111 @@
+# HTTP/REST API
+
+JSON-базиран REST API за уеб приложения.
+
+## Базов URL
+
+```
+http://localhost:9470
+```
+
+## Endpoints
+
+### GET /health
+
+Health проверка:
+
+```bash
+curl http://localhost:9470/health
+```
+
+### GET /ready
+
+Readiness проверка:
+
+```bash
+curl http://localhost:9470/ready
+```
+
+### POST /query
+
+Изпълнение на BaraQL заявка:
+
+```bash
+curl -X POST http://localhost:9470/api/query \
+  -H "Content-Type: application/json" \
+  -d '{"query": "SELECT * FROM users WHERE age > 18"}'
+```
+
+Отговор:
+```json
+{
+  "columns": ["name", "age"],
+  "rows": [["Alice", 30], ["Bob", 25]],
+  "row_count": 2,
+  "duration_ms": 12
+}
+```
+
+### POST /batch
+
+Групови заявки:
+
+```bash
+curl -X POST http://localhost:9470/api/batch \
+  -H "Content-Type: application/json" \
+  -d '{"queries": ["INSERT users { name := \"Alice\" }", "INSERT users { name := \"Bob\" }"]}'
+```
+
+### GET /schema
+
+Преглед на схемата:
+
+```bash
+curl http://localhost:9470/api/schema
+```
+
+### GET /metrics
+
+Prometheus метрики:
+
+```bash
+curl http://localhost:9470/metrics
+```
+
+### POST /explain
+
+Обяснение на план за изпълнение:
+
+```bash
+curl -X POST http://localhost:9470/api/explain \
+  -H "Content-Type: application/json" \
+  -d '{"query": "SELECT * FROM users WHERE age > 18"}'
+```
+
+### POST /backup
+
+Създаване на backup:
+
+```bash
+curl -X POST http://localhost:9470/api/backup \
+  -H "Content-Type: application/json" \
+  -d '{"destination": "/backup/snapshot.db"}'
+```
+
+## Грешки
+
+```json
+{
+  "error": {
+    "code": "INVALID_QUERY",
+    "message": "Грешка в синтаксиса"
+  }
+}
+```
+
+## Автентикация
+
+```bash
+curl -H "Authorization: Bearer <token>" \
+  http://localhost:9470/api/users
+```