fix: DocumentAddByFileApi miss data_source_type field but there is a mandatory value check

[lyfuci]

Summary

Fixed a bug in DocumentAddByFileApi where the data_source_type field and its corresponding value were missing when constructing the data_source. Fixes #12272

Screenshots

before:

after:

Checklist

Important

Please review the checklist below before submitting your pull request.

• 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

[crazywoola]

Please fix the error in CI.

[JohnJyong]

pls fix the python style check @lyfuci

[lyfuci]

@JohnJyong I am quite a rookie for this project, and after running the ruff format command, I found that a comma was missing at the end, and adjusted.

After checking the DocumentUpdateByFileApi, I noticed the same problem of the issue relatted to this PR exists and has been fixed as well.

[laipz8200]

Just run dev/reformat to fix this.

[lyfuci]

Just run dev/reformat to fix this.

@laipz8200 thanks，I use "ruff format" command seems work, anything wrong just tell me.