Fix bot debate outcome update filtering on wrong field

[shwetd19]

Fixes #395

UpdateDebateVsBotOutcome filtered on a userId field while being passed an email, and the documents store it under email — so the update matched nothing. It now filters on email, targets the most recent debate (sorted by createdAt), and the caller logs the error instead of silently discarding it.

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📥 Commits

Reviewing files that changed from the base of the PR and between 51532ff and de4f136.

📒 Files selected for processing (2)

• backend/controllers/debatevsbot_controller.go
• backend/db/db.go

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