fix: Pass fake api_key to the internal ai model

Author: szykol

tests/ai_test_model.py

@@ -85,7 +85,7 @@ async def _buildInternalAIModel(
     return OpenAIModel(
         model=model,
         base_url=f"{base_url}/{model}",
-        api_key="",  # unused
+        api_key="test-api-key",  # unused
         extra_body={"user": f'{{"appkey":"{app_key}"}}'},
         httpx_client=httpx.AsyncClient(auth=auth_handler),
         temperature=0.0,