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/ar/baraql.md

@@ -97,5 +97,172 @@ RETURN friend.name;
 ```sql
 BEGIN;
 INSERT users { name := 'Alice', age := 30 };
+INSERT orders { user_id := last_insert_id(), total := 100 };
 COMMIT;
-```
+
+-- مع نقطة حفظ
+BEGIN;
+INSERT users { name := 'Bob', age := 25 };
+SAVEPOINT sp1;
+INSERT orders { user_id := last_insert_id(), total := 200 };
+-- خطأ، التراجع إلى نقطة الحفظ
+ROLLBACK TO sp1;
+COMMIT;
+```
+
+## البحث النصي الكامل
+
+```sql
+-- بحث أساسي
+SELECT * FROM articles
+WHERE MATCH(title, body) AGAINST('database programming');
+
+-- مع درجة الصلة
+SELECT title, relevance()
+FROM articles
+WHERE MATCH(title, body) AGAINST('Nim language')
+ORDER BY relevance() DESC;
+
+-- الوضع المنطقي
+SELECT * FROM articles
+WHERE MATCH(title, body) AGAINST('+Nim -Python' IN BOOLEAN MODE);
+
+-- البحث الضبابي
+SELECT * FROM articles
+WHERE MATCH(title) AGAINST('programing' WITH FUZZINESS 2);
+```
+
+## الدوال المحددة من المستخدم
+
+```sql
+-- تسجيل UDF
+CREATE FUNCTION greet(name str) -> str {
+  RETURN 'Hello, ' || name || '!';
+};
+
+-- استخدامها
+SELECT greet(name) FROM users;
+
+-- الدوال المدمجة
+SELECT abs(-5), sqrt(16), lower('HELLO'), len('test');
+```
+
+## تلميحات الاستعلام
+
+```sql
+-- فرض استخدام الفهرس
+SELECT /*+ USE_INDEX(idx_users_age) */ * FROM users WHERE age > 18;
+
+-- فرض البحث المتجهي التقريبي
+SELECT /*+ APPROXIMATE */ * FROM vectors
+ORDER BY cosine_distance(embedding, [...])
+LIMIT 10;
+
+-- التنفيذ المتوازي
+SELECT /*+ PARALLEL(4) */ * FROM large_table;
+```
+
+## دوال النوافذ
+
+```sql
+-- دوال الترتيب
+SELECT
+  name,
+  department,
+  ROW_NUMBER() OVER (PARTITION BY department ORDER BY salary DESC) AS rn,
+  RANK() OVER (PARTITION BY department ORDER BY salary DESC) AS r,
+  DENSE_RANK() OVER (PARTITION BY department ORDER BY salary DESC) AS dr
+FROM employees;
+
+-- دوال القيمة
+SELECT
+  name,
+  salary,
+  LAG(salary, 1, 0) OVER (ORDER BY salary) AS prev_salary,
+  LEAD(salary, 1, 0) OVER (ORDER BY salary) AS next_salary,
+  FIRST_VALUE(name) OVER (PARTITION BY department ORDER BY salary) AS cheapest,
+  LAST_VALUE(name) OVER (PARTITION BY department ORDER BY salary) AS most_expensive
+FROM employees;
+
+-- دوال التوزيع
+SELECT name, NTILE(4) OVER (ORDER BY salary) AS quartile FROM employees;
+```
+
+### مواصفات الإطار
+
+```sql
+-- إطار ROWS
+SUM(salary) OVER (
+  PARTITION BY department
+  ORDER BY hire_date
+  ROWS BETWEEN 1 PRECEDING AND CURRENT ROW
+)
+
+-- إطار RANGE
+SUM(salary) OVER (
+  PARTITION BY department
+  ORDER BY hire_date
+  RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+)
+```
+
+## ERP متعدد المستأجرين
+
+يدعم BaraDB تشغيل عدة شركات (مستأجرين) في مثيل قاعدة بيانات واحد، باستخدام **أمان مستوى الصف (RLS)** مع **متغيرات الجلسة**.
+
+### متغيرات الجلسة
+
+```sql
+SET app.tenant_id = 'company-123';
+SELECT current_setting('app.tenant_id') AS tenant;
+```
+
+### المستخدم / الدور الحالي
+
+```sql
+SELECT current_user AS me, current_role AS my_role;
+```
+
+### عزل المستأجر عبر RLS
+
+```sql
+-- تمكين RLS على جدول
+ALTER TABLE invoices ENABLE ROW LEVEL SECURITY;
+
+-- إنشاء سياسة تصفية حسب المستأجر
+CREATE POLICY tenant_isolation ON invoices
+  FOR SELECT USING (tenant_id = current_setting('app.tenant_id'));
+
+-- كل جلسة ترى فقط بياناتها
+SET app.tenant_id = 'company-a';
+SELECT * FROM invoices;  -- صفوف company-a فقط
+```
+
+### لماذا متعدد المستأجرين؟
+
+- **مثيل واحد، مستأجرون كثيرون** — لا حاجة لتشغيل 100 قاعدة بيانات منفصلة
+- **مستندات JSONB** — تخزين مخطط مرن، سهل إضافة حقول لكل مستأجر
+- **RLS يضمن العزل** — قاعدة البيانات تفرض حدود المستأجر، وليس فقط التطبيق
+
+## الكلمات المفتاحية المدعومة
+
+| الفئة | الكلمات المفتاحية |
+|----------|----------|
+| DQL | SELECT, FROM, WHERE, ORDER BY, GROUP BY, HAVING, LIMIT, OFFSET, DISTINCT |
+| DML | INSERT, UPDATE, DELETE, SET, VALUES |
+| DDL | CREATE TYPE, DROP TYPE, CREATE INDEX, DROP INDEX, ALTER TYPE |
+| Join | INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN, CROSS JOIN, ON |
+| Set | UNION, UNION ALL, INTERSECT, EXCEPT |
+| CTEs | WITH, RECURSIVE, AS |
+| Case | CASE, WHEN, THEN, ELSE, END |
+| Transaction | BEGIN, COMMIT, ROLLBACK, SAVEPOINT |
+| Graph | MATCH, RETURN, WHERE, shortestPath, type |
+| FTS | MATCH, AGAINST, relevance, IN BOOLEAN MODE, WITH FUZZINESS |
+| Vector | cosine_distance, euclidean_distance, inner_product, l1_distance, l2_distance, <-> |
+| JSON | ->, ->> |
+| FTS | @@ (تطابق BM25) |
+| Recovery | RECOVER TO TIMESTAMP |
+| Functions | count, sum, avg, min, max, stddev, variance, abs, sqrt, lower, upper, len, trim, substr, now, last_insert_id, current_setting |
+| Session | SET, current_setting, current_user, current_role |
+| Window | OVER, PARTITION BY, ROWS, RANGE, UNBOUNDED PRECEDING, CURRENT ROW, FOLLOWING |
+| Window Functions | ROW_NUMBER, RANK, DENSE_RANK, LEAD, LAG, FIRST_VALUE, LAST_VALUE, NTILE |