Fix FakeAnthropic mock to accept kwargs (timeout parameter)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: a-deal

tests/test_v1_api.py

@@ -677,7 +677,7 @@ def create(self, **kwargs):
                 return FakeMessage()
 
         class FakeAnthropic:
-            def __init__(self):
+            def __init__(self, **kwargs):
                 self.messages = FakeMessages()
 
         monkeypatch.setattr(fp_mod.anthropic, "Anthropic", FakeAnthropic)