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50543c31f7
When an upstream Gemini SSE stream emitted partial content followed by a JSON
error object ({"error":{"code":503,...,"status":"UNAVAILABLE"}}) instead of a
candidates payload, the gemini→openai translator dropped it: the no-candidate
branch only handled promptFeedback and returned null otherwise, so the stream
ended with finish_reason "stop" and the client got HTTP 200 with a truncated
body — masking the failure and skipping combo fallback.
geminiToOpenAIResponse now detects an error object (optionally wrapped in
response), records it as state.upstreamError preserving the real status (503/
UNAVAILABLE, or 429 for RESOURCE_EXHAUSTED), and lets stream.ts error the stream
out via the existing onFailure/buildErrorBody/controller.error path — the same
mechanism the openai-responses translator already uses.
Closes #4177
Co-authored-by: hartmark <hartmark@users.noreply.github.com>