fix: add universal-2 fallback for languages unsupported by universal-…

[dtrn2048]

universal-3-pro does not support all languages (e.g. Dutch/nl). Setting speech_models to ["universal-3-pro", "universal-2"] lets AssemblyAI fall back to universal-2 for the 99 languages not covered by universal-3-pro.

Also fetch and store the real AssemblyAI error reason in the webhook error handler instead of the generic "AssemblyAI error for transcript ".

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