Seayon

**What kind of change does this PR introduce?** (check at least one) - [ ] Bugfix - [ ] Feature - [ ] Code style update - [ ] Refactor...

Improve MIME type detection for image URLs

1

Implement fallback to content-based detection using Pillow when URL-based guess fails, enhancing accuracy while maintaining efficiency. # Checklist: > [!IMPORTANT] > Please review the checklist below before submitting your pull...

### Self Checks - [X] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [X] I confirm that I am using English to submit this...