Update settings.json

[iwayemi5]

Refactor authentication middleware for improved error handling

Summary

This PR refactors the authentication middleware to improve readability, error handling, and maintainability without changing existing functionality.

Changes

• Simplified token validation logic.
• Centralized authentication error responses.
• Removed duplicate null and expiration checks.
• Added inline comments for complex sections.
• Expanded unit test coverage for invalid and expired tokens.

Testing

• All existing unit tests pass.
• Added tests for malformed, expired, and missing tokens.
• Verified authentication flow manually in the development environment.

Notes

This is a refactor only—no API changes or database migrations are included. Existing clients should not experience any behavioral changes.

close #969

[RUKAYAT-CODER]

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