Fix: Add voice_id to allowed fields in lecture repository update_fields method When regenerating lecture audio with an updated professor voice, the voice_id field was being silently ignored during the update. This caused lectures to retain their old voice_id even after audio regeneration. The update_fields method had an allowed_fields whitelist that did not include 'voice_id', and the return statement also omitted it. This fix: - Adds 'voice_id' to the allowed_fields set - Includes voice_id in the returned Lecture model Now when audio is regenerated with a professor's updated voice, the lecture record correctly stores the new voice_id.

[ballPointPenguin]

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