Cleaning up the admin auth features

[SOG-web]

Description

Clean up and improve the admin authentication features in the auth library.

Tasks

• Review current admin authentication implementation
• Refactor admin routes and controllers
• Improve admin user management
• Enhance admin role and permission system
• Add comprehensive admin dashboard API
• Implement better admin session management
• Add audit logging for admin actions
• Improve security for admin endpoints
• Document admin features and API

Acceptance Criteria

• Admin features are well-organized and maintainable
• Admin API is intuitive and secure
• Admin dashboard functionality is comprehensive
• Documentation is complete