This consolidates the docs site nav into 5 pillars and aligns the
technology-stack page URL with its new home inside the develop pillar.
Pillar restructure (docs/.vitepress/config.mts + locales):
* architecture absorbs the previous Overview pillar — its pages now
live under a '项目总览' group, with the existing architecture
detail groups following.
* AI is extracted out of Develop into a top-level pillar between
Drivers and Foundations. The previously orphaned
ai/spring-ai-deep-dive page is now reachable from the sidebar.
* Operations is merged into Develop. The Develop sidebar runs 6
groups ordered by reader workflow:
快速开始 → 部署与运维 → 开发 → 前端 → 自动化 → 运营.
File move:
* introduction/technology-stack.md -> development/technology-stack.md
(zh + en) so the page URL matches its sidebar home.
The zh / en locale files keep identical key sets (141 keys, no diff).
pnoker
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