Fix/update cur team

[MayueCif]

fix:insert or update on table "Staff" violates foreign key constraint "FK_Staff_Team_CurrentTeamId"

[Copilot]

Pull request overview

This PR fixes a foreign key constraint violation that occurred when attempting to clear a staff member's current team during LDAP synchronization. The root cause was using Guid.Empty instead of null to clear the CurrentTeamId, which violated the FK constraint since no Team with ID 00000000-0000-0000-0000-000000000000 exists.

Changes:

• Updated SetCurrentTeam method to accept nullable Guid? parameter instead of non-nullable Guid
• Changed the LDAP sync logic to pass null instead of Guid.Empty when clearing a staff's current team

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Domain/Masa.Auth.Domain/Subjects/Aggregates/Staff.cs	Modified SetCurrentTeam method signature to accept Guid? instead of Guid, allowing null values for clearing the current team
src/Services/Masa.Auth.Service.Admin/Application/Subjects/StaffCommandHandler.cs	Updated LDAP sync logic to pass null instead of Guid.Empty when disabling users and clearing their team assignments

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