Remove unsafe unregistered Elo update endpoint

[shwetd19]

Fixes #392

UpdateEloAfterDebate accepted client-supplied winnerId/loserId with no participation checks, letting any logged-in user set arbitrary ratings. The handler is not registered in main.go and has no frontend callers, so it is removed along with its route wrapper and the now-unused calculateEloRating helper. Ratings continue to be updated through the existing debate-result flow (services.UpdateRatings).

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📥 Commits

Reviewing files that changed from the base of the PR and between 51532ff and 30ee13b.

📒 Files selected for processing (2)

• backend/controllers/profile_controller.go
• backend/routes/profile.go

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