* refactor(sdk): keep legacy migration out of client APIs Co-authored-by: Cursor <cursoragent@cursor.com> * fix(migration): stage SDK data before cutover Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: alvinfei <alvinfei@tencent.com> Co-authored-by: Cursor <cursoragent@cursor.com>