[CORRUPTED] Synthetic Benchmark PR #30638 - refactor: port api/fields/file_fields.py

[ofir-frd]

Benchmark PR langgenius#30638

Type: Corrupted (contains bugs)

Original PR Title: refactor: port api/fields/file_fields.py
Original PR Description: > [!IMPORTANT]

1. Make sure you have read our contribution guidelines
2. Ensure there is an associated issue and you have been assigned to it
3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

part of langgenius#28015

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 make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

Original PR URL: langgenius#30638

Compliance Violation

• Rule: Backend HTTP Requests Must Use SSRF Proxy Helper
• Language: Python
• File: api/controllers/web/remote_files.py