YEU CAU: BAO CAO MUA HANG THANG 10/2026 — KY "TU 1->3 THANG 10/2026"

File du lieu moi: "mua hang thang 10- 26.xlsx" (nam ngay trong thu muc nay, vua nhan tu Zalo ngay 05/10/2026).
Trong thu muc nay DA CO san cac quy uoc cua ky truoc (thang 9): SKILL\Skill.txt, skill.md, SKILL\clean_purchase_reports.py, process_all.py, generate_docx_report.py, Bao_cao\build_muahang_t9_portal.py, File-lam-sach\MUA_HANG_26T9-26_DA-LAM-SACH.xlsx (ky T9: 1->26 thang 9), NHAT_KY_agy_T9_26.md.
HAY DOC cac file skill + script do TRUOC de lam dung quy uoc dang co, roi thuc hien 5 buoc sau:

1) LAM SACH (theo SKILL\Skill.txt):
   - Giu 1 sheet "FILE GỐC" (xoa cac sheet phu "QN- T 10" va "MUA HÀNG T- 10").
   - Header dong 4: them " (Khối lượng Kg)" vao cac cot thang 01..09/2026; cot cuoi (cot 13) dat tieu de "Từ 1->3 Tháng 10 2026".
   - Giu nguyen du lieu + dong "Tổng cộng" cuoi bang (dong 195: Tong 116.584 Kg cho cot ky moi). So nguyen (int). Do rong cot theo skill.
   - Luu: File-lam-sach\MUA_HANG_03T10-26_DA-LAM-SACH.xlsx

2) SO SANH + BAO CAO DOCX (theo skill.md):
   - Tinh TB/ngay (Kg/ngay) tung thang: T1..T9 dung so ngay 31/28/31/30/31/30/31/31/30; ky T10 = 3 ngay.
   - So sanh ky T10 (3 ngay) voi T9 (30 ngay): chenh lech Kg/ngay va %.
   - Tao DOCX co 2 bang: (a) bang tom tat toan cong ty theo tung thang (Tong Kg, so ngay, TB/ngay, so sanh voi thang truoc); (b) bang chi tiet 191 KH (STT, Ma KH, Ten KH, TB/ngay T1..T9, TB/ngay T10, chenh lech Kg/ngay, chenh lech %).
   - Dinh dang theo skill.md (Tieu de 16pt in dam can giua; heading 13-14pt; noi dung 11-12pt; so nguyen; phan tram 1 chu so thap phan co dau +/-).
   - Luu: Bao_cao\BAO_CAO_SO_SANH_MUA_HANG_T10_ky03.docx

3) PORTAL HTML:
   - Dung Bao_cao\build_muahang_t9_portal.py lam mau, doc tu DOCX vua tao (doi SRC/OUT dung file moi).
   - Luu: Bao_cao\Baocaomuahang_thang10_ky01-03-10-2026.html

4) XUAT DU LIEU DE NAP CSDL (quan trong):
   - Tao file JSON: Bao_cao\capnhat_csdl_T10_ky03.json voi cau truc:
     {"ky": "T10", "so_ngay": 3, "tong_kg": <so>, "tb_ngay": <so>, "so_sanh": "<chuoi dang +X (+Y%)>",
      "khach_hang": [{"ma_kh": "KH1090", "ten": "XI NGHIEP THANG LOI", "tong_kg": <so>, "kg_ngay": <so>, "so_sanh": "<chuoi>"}, ...]}
   - Trong do: kg_ngay = tong_kg/3 (lam tron 0 chu so thap phan), so_sanh so voi T9 dang "+X (+Y%)" hoac "-X (-Y%)".
   - Phai co du 191 khach hang (bo dong "Tổng cộng").

5) NHAT KY: ghi dan tien do vao file NHAT_KY_agy_T10_ky03.md (moi buoc xong ghi 1-2 dong, co so lieu). Dong cuoi ghi "HOAN TAT".

LUU Y: BAT BUOC ghi file that (khong chi in ra chat). So lieu phai dung, khong duoc bia. Neu 1 buoc loi thi ghi ro loi vao nhat ky va tiep tuc buoc khac.