try flask_restful -> flask_restx

[asukaminato0721]

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part of #24173

Summary

This is only a test, to try to update something.

this can have auto swagger doc generation. https://flask-restx.readthedocs.io/en/latest/swagger.html

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[laipz8200]

merged into our development environment for testing.

[laipz8200]

I think this change has been tested. Would you be willing to rebase main and verify it's up to date?