[Hotfix] change postAPI embedding model _parse_resonse to OpenAI format

[ZiTao-Li]

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name: Pull Request about: Create a pull request

Description

As title, we change postAPI embedding model _parse_resonse to OpenAI format for more general scenarios.

Checklist

Please check the following items before code is ready to be reviewed.

• [x] Code has passed all tests
• [x] Docstrings have been added/updated in Google Style
• [x] Documentation has been updated
• [x] Code is ready for review