docs: complete documentation for Milestone 4

- Rewrite README.md with overview, requirements, setup, run, tests
  sections
- Add docs/flowchart.md with Mermaid diagram and link to diagrams.net
  source
- Update docs/plan.md to mark Milestone 4 as complete
This commit is contained in:
2026-10-04 14:21:31 +08:00
parent 8d13657773
commit 6a8ab289c6
3 changed files with 94 additions and 84 deletions
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