Unify MOCK_USERS with backend auth (admin id=1), merge session identity on login, and migrate demo seeds/tests to id 2/3/4 for 张工/李/王. Co-authored-by: Cursor <cursoragent@cursor.com>
Unify MOCK_USERS with backend auth (admin id=1), merge session identity on login, and migrate demo seeds/tests to id 2/3/4 for 张工/李/王. Co-authored-by: Cursor <cursoragent@cursor.com>