Fix User Authentication Bug, Add Logging amd Modernised the Application

[innovatedev9]

Title: Fix User Authentication Bug and Add Logging

Description

This pull request addresses the following:

1. Fixes a bug in user authentication logic where invalid credentials were not handled correctly.
2. Adds logging for successful and failed authentication attempts.
3. Updates unit tests to cover the new scenarios.

Motivation

The bug was causing invalid login attempts to bypass certain checks, leading to potential security issues. Logging was added to improve traceability and debugging in production.

Changes

• Updated AuthenticationService.java to fix the credential check logic.
• Added new logs in AuthLogger.java for tracking login attempts.
• Modified unit tests in AuthenticationServiceTest.java.

Testing

• Manually tested the login flow using valid and invalid credentials.
• Ran all unit tests using mvn test to ensure no regressions.

Checklist

• Bug fixed in authentication logic.

• Logging implemented.

• Unit tests updated.

• Code reviewed for adherence to style guidelines.