CSRF due to overly permissive CORS headers in netease-youdao/qanything

A Cross-Site Request Forgery (CSRF) vulnerability exists in the backend API of netease-youdao/qanything, as of commit d9ab8bc. The backend server has overly permissive CORS headers, allowing all cross-origin calls. This vulnerability affects all backend endpoints, enabling actions such as creating, uploading, listing, deleting files, and managing knowledge bases.