CVE-2026-48074: OpenReception: Staff deletion removes pending invites cross-tenant by email match

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.6, when a TENANTADMIN deletes an existing staff user, the underlying StaffService.deleteStaffMember() runs an additional invite cleanup that deletes from the central userinvite table by email. The email clause has no tenantId predicate. Any pending invite in any tenant that shares the deleted staff's email is removed. A TENANTADMIN of tenant A who deletes a staff record with email victim[@]example[.]com also deletes the pending invite for victim[@]example[.]com in tenant B, even though they have no relationship to tenant B. The user-side delete is correctly scoped (eq(user.id, staffId), eq(user.tenantId, tenantId)), and the pending-invite-only delete path (when staffId is itself an invite ID) is also tenant-scoped. The bug is specifically in the invite cleanup that runs as a side effect of deleting an existing staff user. Version 1.0.6 patches the issue.