Sách Giáo Khoa Việt Nam - sachgiaokhoa.org

CodeIgniter 4 website:
- Catalog 999 SGK (lớp 1-12) từ API, lọc theo lớp/môn/NXB, tìm kiếm
- Trang chủ grouped browse (bậc học -> lớp -> môn, ưu tiên môn quan trọng)
- Chi tiết sách: metadata đầy đủ, cover nghệ thuật /thumb/{W}x{H}/
- Đọc online qua gate captcha + countdown, PDF viewer pdf.js
- Download: captcha + token một lần + auto cache-bust version
- Tự đồng bộ catalog/cover khi API thay đổi (refresh:catalog)
- Legal: DMCA, miễn trừ trách nhiệm, điều khoản, bảo mật, liên hệ

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