[CORRUPTED] Synthetic Benchmark PR #30254 - chore: use from __future__ import annotations

[tomerqodo]

Benchmark PR langgenius#30254

Type: Corrupted (contains bugs)

Original PR Title: chore: use from future import annotations
Original PR Description: ## Summary
Fixes: langgenius#24303. This PR refactors type annotations across the codebase by enabling from __future__ import annotations and replacing quoted type annotations (e.g. "T") with direct references (T). This is a refactor-only change with no functional or behavioral impact. The goal is to simplify type hints and improve readability and
maintainability.

Testing

• Ran backend locally to ensure the application starts and imports correctly
• Verified no syntax or runtime errors after refactoring

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 dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Original PR URL: langgenius#30254