🤖 Limit the size and number of uploaded files

[Yanyutin753]

Pull Request Checklist

• [x] Target branch: Please verify that the pull request targets the dev branch.
• [x] Description: Provide a concise description of the changes made in this pull request.
• [x] Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
• [x] Documentation: Have you updated relevant documentation Open WebUI Docs, or other documentation sources?
• [x] Testing: Have you written and run sufficient tests for validating the changes?
• [x] Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?

Changelog Entry

Description

Limit the size and number of uploaded files #4327

Warning

[Yanyutin753]

@tjbck everything is Ok, Tkanks for reviewing the code!

[tjbck]

Feel free to reopen after rebasing!