UPLOAD IMAGE - KHONG GIOI HAN DUNG LUONG O TANG APPLICATION

Da bo cac rule max:<KB> tren cac validation upload anh va bo gioi han 10MB/50MB trong upload local.
Van GIU NGUYEN kiem tra image/mimes/MIME hien co de tranh upload sai loai file.

Luu y: day khong the tao dung luong vo han tren HTTP. Gioi han thuc te van do PHP/web server/CDN quyet dinh, vi du:
- PHP: upload_max_filesize, post_max_size
- Nginx: client_max_body_size
- Apache/LiteSpeed/hosting: request/body limits
- CDN/proxy: request upload limits

Khong nen dat gioi han server qua lon/vo han tren public endpoint vi co the bi loi dung de lam day disk/RAM/bandwidth (DoS).
