feat(clients): professional clients with tests, CI/CD, and examples

- Python: pyproject.toml, pytest suite (unit + integration), README, examples
- JavaScript: package.json, TypeScript definitions, node:test suite, README, examples
- Nim: integration tests, examples, README, improved nimble tasks
- Rust: fixed nodelay/localhost IPv6 bug, integration tests, examples, README
- Added GitHub Actions CI for all 4 clients against Docker server
- Added docker-compose.test.yml for local integration testing
- Added .gitignore for each client

clients/python/baradb/__init__.py

@@ -0,0 +1,39 @@
+"""
+BaraDB Python Client
+
+Official Python client for BaraDB — Multimodal Database Engine.
+Communicates via the BaraDB Wire Protocol (binary, big-endian, TCP).
+
+Install:
+    pip install baradb
+
+Quick Start:
+    from baradb import Client
+    client = Client("localhost", 9472)
+    client.connect()
+    result = client.query("SELECT name FROM users WHERE age > 18")
+    for row in result:
+        print(row["name"])
+    client.close()
+"""
+
+from .core import (
+    Client,
+    QueryBuilder,
+    QueryResult,
+    WireValue,
+    MsgKind,
+    FieldKind,
+    ResultFormat,
+)
+
+__version__ = "1.0.0"
+__all__ = [
+    "Client",
+    "QueryBuilder",
+    "QueryResult",
+    "WireValue",
+    "MsgKind",
+    "FieldKind",
+    "ResultFormat",
+]