feat(doc): add API documentation and architectural design for Vermeer

[coderzc]

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Purpose of the PR

• close #xxx

Main Changes

Verifying these changes

• [x] Trivial rework / code cleanup without any test coverage. (No Need)
• [ ] Already covered by existing tests, such as (please modify tests here).
• [ ] Need tests and can be verified as follows.

Does this PR potentially affect the following parts?

• [ ] Nope
• [ ] Dependencies (add/update license info)
• [ ] Modify configurations
• [ ] The public API
• [ ] Other affects (typed here)

Documentation Status

• [ ] Doc - TODO
• [x] Doc - Done
• [ ] Doc - No Need