fix(api): restful to restx migration issue

[MatriQ]

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Summary

Close #24415

This PR fixes a few endpoints that broke during the migration from restful to restx.

Screenshots

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

[Eric-Guo]

LGTM