[docs] IAM — IP Whitelist user guide + Jul 2026 release note — VI + EN

[greennode-vdb]

VI + EN docs for the IAM IP Whitelist feature (released July 2026).

New pages

• Vietnamese/identity-and-access-management-iam/cau-hinh-ip-whitelist.md
• English/identity-and-access-management-iam/configure-ip-whitelist.md

Release note (global 2026, tab Tính năng mới / New features, under July 2026)

• Vietnamese/gioi-thieu-chung/thong-bao-va-cap-nhat/2026.md
• English/overview/product-updates-all/2026.md

Nav

• Vietnamese/SUMMARY.md, English/SUMMARY.md — 1 entry each, added as the last page of the IAM section.

Assets — 3 screenshots under .gitbook/assets/IP-whitelist/ in both language spaces.

Open questions for the product team (documented under assumptions, worth confirming before publish)

• Quota: number of IP whitelists per account is not specified anywhere; only the 10 IP/CIDR per rule limit is documented.
• The IAM action / policy name required to manage IP Whitelist is not documented.
• Lockout recovery path — the guide currently tells users to contact 24/7 support.
• UI copy issues spotted: Add form Scopes hint reads "Select at least scope…" (missing "one"); the same field is labelled IP addresses & IP ranges on Add but CIDRs on Edit; the Edit form's Description hint omits the 300-character rule.

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