Add public close() to release the HTTP client

src/saic_ismart_client_ng/api/base.py

@@ -53,6 +53,10 @@ def __init__(
         self.__api_client = SaicApiClient(configuration, listener=listener)
         self.__token_expiration: datetime.datetime | None = None
 
+    async def close(self) -> None:
+        """Close the API client and release its HTTP resources."""
+        await self.__api_client.close()
+
     async def login(self) -> LoginResp:
         headers = {
             "Content-Type": "application/x-www-form-urlencoded",

src/saic_ismart_client_ng/net/client/__init__.py

@@ -38,6 +38,10 @@ def __init__(
     async def send(self, request: Request) -> Response:
         return await self.__client.send(request)
 
+    async def close(self) -> None:
+        """Close the underlying HTTP client and release its connections."""
+        await self.__client.aclose()
+
     @property
     def user_token(self) -> str:
         return self.__user_token