fix: add ORDER BY to ListUsers query for deterministic ordering

The query had no ORDER BY clause, causing non-deterministic result
ordering on PostgreSQL where row order is not guaranteed.

pkg/user/users_project.go

@@ -149,6 +149,7 @@ func ListUsers(s *xorm.Session, search string, currentUser *User, opts *ProjectU
 
 	err = s.
 		Where(cond).
+		OrderBy("id").
 		Find(&users)
 
 outer: