Separate the public docs (how to understand, deploy, and use IoT DC3) from
engineering material (design drafts, analyses, roadmaps, legacy operation
screenshots):
- add an internal archive area with its own nav, grouping design,
analysis, strategy, backlog, and legacy-operation sections
- migrate design, operation (data/device/driver/template), analyses, and
todo notes into the archive, preserving history
- refresh public docs: README (en/zh/ja/vi), operation guides
(agentic/concepts/data-commands/device-onboarding), architecture,
development, guide, quickstart, and modules
- promote the project overview to README.ai.md at the repo root
pnoker