fix pyright issues

Author: wzxxing

mcp_proxy_for_aws/proxy.py

@@ -78,7 +78,7 @@ class AWSMCPProxy(_FastMCPProxy):
     def __init__(
         self,
         *,
-        client_factory: ClientFactoryT | None = None,
+        client_factory: ClientFactoryT,
         **kwargs,
     ):
         """Initialize a client."""

tests/unit/test_utils.py

@@ -138,7 +138,8 @@ def test_create_transport_with_sigv4_kwargs_passthrough(
 
         assert hasattr(result, 'httpx_client_factory')
         factory = result.httpx_client_factory
-        factory(headers=None, timeout=None, auth=None, follow_redirects=True)
+        assert factory is not None
+        factory(headers=None, timeout=None, auth=None, follow_redirects=True)  # type: ignore[call-arg]
 
         mock_create_sigv4_client.assert_called_once_with(
             service=service,