Enhance basic-auth.middleware example with password hashing and env variables

[vincenzodomina]

I have elaborated on the basic auth example to be more production friendly, of course open for feedback.

Changes

• Replace hardcoded credentials with ConfigService-based configuration
• Implement bcrypt for secure password hashing and comparison
• Improve error handling and code structure

This change significantly improves the security of the Bull Board authentication

[felixmosh]

Hi @vincenzodomina thank you for this improvments