e736de1ed9
DeriveUpstreamEndpoint hard-codes /v1/responses for PlatformOpenAI, but APIKey accounts probed to not support Responses API are forwarded directly to /v1/chat/completions via forwardAsRawChatCompletions. Add resolveRawCCUpstreamEndpoint which returns /v1/chat/completions when the account's extra.openai_responses_supported is explicitly false.