[docs] AI Stack — Token Plan: fix glued words, add AI Coding cross-links, EN A-Z guide — VI + EN

[greennode-vdb]

What changed

1. Folder cleanup — a stray maas-plan/ duplicate of token-plan/ had appeared in both languages. Verified byte-identical (CRLF-only diff) and removed, so the SUMMARY.md paths and the published .../ai-stack/token-plan/... URLs stay intact.

2. Fixed glued words in the VI A-Z guide — 19 GitBook round-trip artifacts where a space was lost before **bold**, [links] or `code`:

Before	After
tính**riêng cho từng model** (rendered tínhriêng)	tính **riêng cho từng model**
Status,**Model code**, tab**Models**, tab**Subscription keys**	space added
So với**Tokens/cycle**, so**Tokens Consumed**, card**Errors**	space added
Mở[aiplatform...], Xem[Phân quyền theo Role]	space added
Chỉ`a-z A-Z...` , thiếu`/v1` , bằng`/v1` , nối`/v1` , bỏ`/v1`	space added
Usage & Cost ×2	Usage & Cost

3. AI Coding cross-links on the Buy / Manage pages (VI + EN) — users who buy a plan now have a path to actually integrating it:

• Buy pages: new "integrate the subscription-key into an AI coding tool" section — a table of the 3 values to collect (Base URL / API key / Model code, and where each lives), then a per-tool guide table (Getting Started, OpenAI-compatible, Claude Code, Codex CLI, OpenCode, Codex Desktop, MCP Servers).
• Manage pages: expanded "using a subscription-key with an AI coding tool" into CLI / GUI guide tables framed around handing a key to a team member, plus a warning that Claude Code uses the Anthropic standard (base URL without /v1).

4. New EN A-Z guide — English/ai-stack/token-plan/a-z-guide.md, translated from the corrected VI page. 23 headings mirrored 1:1; paths mapped to the EN tree (cli-tools/, getting-started.md, view-usage-cost.md, roles-and-permissions.md). Linked from the EN README and added to English/SUMMARY.md.

Verification

All 8 Token Plan files pass: 0 dead relative links, 0 dead heading anchors (including the diacritic-stripped anchors GitBook generates for Vietnamese headings), every table has a separator row, hint/tabs/tab blocks balanced, no unclosed code fences.

Files

• English/SUMMARY.md
• English/ai-stack/token-plan/{README,a-z-guide,buy-token-plan,manage-token-plan}.md
• Vietnamese/ai-stack/token-plan/{huong-dan-a-z,mua-goi-token-plan,quan-ly-token-plan}.md

🤖 Generated with Claude Code