Add risk score to fraud prevention log table

🔍 Problem Statement

The fraud prevention log table does not include a risk score for flagged transactions. Admins can see that a transaction was flagged but have no quantitative measure to prioritise review — treating all flags equally regardless of severity.

💡 User Story

As a Pelcro admin, I want a risk score displayed in the fraud prevention log table, so that I can prioritise reviews by severity rather than treating all flagged transactions equally.

🎯 Definition of Done (DoD)

A feature is done when:

✔️ Given a flagged transaction in the fraud prevention log, when an admin views the table, then a risk score (e.g. 0–100) is displayed for each entry — and the table can be sorted by risk score.