Admin panel - Enhanced User Management & Fix: #1630

[Ludy87]

Description

• Blocking automatic user registration: By adding the blockRegistration key to the settings, admins can prevent users from logging in via SSO (Single Sign-On) without being pre-approved by the admin. Example: blockRegistration: true.
• Addition of active session display in the admin panel: Admins can now view currently active user sessions in the admin panel, including session ID and username information.
• Added ability to disable users: Admins now have the option to disable user accounts, effectively locking them out of the system.
• Display of the last request timestamp: The time of the last user request is now displayed in the admin panel, making it easier to manage and monitor user activity.
• Bugfix for setting loginMethod: normal: Fixed an issue that occurred when setting loginMethod: normal, ensuring the correct authentication method is applied.
• Removal of unused code: Unnecessary and outdated code has been removed from the codebase, improving maintainability.
• Optimization of session management functionality: Enhanced session management, including the ability to terminate sessions and display the last request information.

Closes #1630

Checklist:

• I have read the Contribution Guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

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(This does not change the general open-source nature of Stirling-PDF, simply moving from one license to another license)