Ask old password during password change

[cotosso]

The current UI allows users to change their password without requiring re-entry of the old password.
Requiring additional authentication during password would enhance system security.

Proposed Solution
Update the password change workflow to require the current password before allowing a new password to be set.

Specifically:
Modify the UI to include a field for the old password.
Update the API to validate the old password as part of the password change request.

[gsanchietti]

This change requires extensive modifications and thorough testing. It involves:

• Removing all calls to ubus to avoid bypass issues.
• Creating a new API inside the api-server directory to enforce security checks and password change
• Updating the UI to integrate with the new API.
• Removing all UI calls togetUciConfig and replacing them with the new API.
• Deleting the ns.account API.

These changes will significantly affect the codebase and require comprehensive testing to ensure system stability and security. For more details, refer to Issue #1023.

Instances of getUciConfig were found in the following files:

1. src/lib/standalone/ubus.ts
2. src/composables/useUciNetworkConfig.ts
3. src/components/standalone/ssh/SshConfig.vue
4. src/views/standalone/network/InterfacesAndDevicesView.vue
5. src/components/standalone/system_settings/GeneralSettings.vue
6. src/components/standalone/system_settings/TimeSynchronization.vue