fix(vision-handoff): omit temperature on vision transcription call (Kimi rejects temperature: 0)

The vision handoff hardcoded temperature: 0 for the transcription sub-call,
but the Moonshot/Kimi vision model only allows temperature: 1 (or omitted),
causing an HTTP 400 "invalid temperature: only 1 is allowed for this model"
that blocked the entire image analysis for non-vision models like GLM 5.2.

Fix: omit temperature entirely so each vision provider uses its own default —
the truly universal, provider-agnostic approach (different providers have
different temperature constraints).

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