Issue: Add Unit Tests for PII Logging Sanitizer

[NahomAlemu]

Description

The logging-sanitizer.ts prevents sensitive data (emails, passwords, tokens) from appearing in logs. No test coverage exists. Critical for GDPR/privacy compliance.

Tasks

Tasks:

• Test email masking
• Test password/token field removal
• Test deep object sanitization
• Test array sanitization

[NahomAlemu]

Closing this as my practicum has concluded and the associated PR has been withdrawn. The branch remains available for reference.