Implement error classification flag to distinguish business and critical errors

[jboix]

Description

As a support engineer, I want to reduce noise in the error monitoring system by distinguishing between business errors and service errors so that I can focus on actionable issues without being overwhelmed by non-critical or expected errors.

Acceptance Criteria

• The system must parse incoming error messages server-side to classify them based on their error type.
• A new flag must be added to error events to indicate their classification.
• No client-side logic for error classification; all rules must be implemented server-side for centralized management and easier updates.