Re-export __version__ from the async PEP 249 module

The sync dqlitedbapi module exposes __version__; the async variant did
not, so dqlitedbapi.aio.__version__ raised AttributeError and the symbol
was absent from aio.__all__. Pull the version string through a single
source-of-truth import and list it in __all__, mirroring the sync module.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: antoineleclair

src/dqlitedbapi/aio/__init__.py

@@ -1,5 +1,6 @@
 """Async PEP 249-style interface for dqlite."""
 
+from dqlitedbapi import __version__
 from dqlitedbapi.aio.connection import AsyncConnection
 from dqlitedbapi.aio.cursor import AsyncCursor
 from dqlitedbapi.exceptions import (
@@ -45,6 +46,7 @@
 
 __all__ = [
     # Module attributes
+    "__version__",
     "apilevel",
     "threadsafety",
     "paramstyle",

tests/test_version_export.py

@@ -1,6 +1,7 @@
 """Test that __version__ is in __all__."""
 
 import dqlitedbapi
+from dqlitedbapi import aio
 
 
 class TestVersionExport:
@@ -9,3 +10,10 @@ def test_version_in_all(self) -> None:
 
     def test_version_is_string(self) -> None:
         assert isinstance(dqlitedbapi.__version__, str)
+
+    def test_aio_module_exports_version(self) -> None:
+        assert hasattr(aio, "__version__")
+        assert aio.__version__ == dqlitedbapi.__version__
+
+    def test_aio_version_in_all(self) -> None:
+        assert "__version__" in aio.__all__