fix: Move API document files from openapi/v3 to openapi

[cherrycl]

Closes #4978

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

New Dependency Instructions (If applicable)

[cloudxxx8]

LGTM

[cloudxxx8]

@cherrycl please rebase to the latest main branch

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.74%. Comparing base (b42af75) to head (c7c3680).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4979   +/-   ##
=======================================
  Coverage   30.74%   30.74%           
=======================================
  Files         266      266           
  Lines       19680    19680           
=======================================
  Hits         6051     6051           
  Misses      12295    12295           
  Partials     1334     1334           

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