Refactor imports: organize and add noqa comments for clarity

[Mihailorama]

Summary

This PR refactors import statements across multiple engine files and test files to improve code organization and readability. The changes follow PEP 8 import ordering conventions and add noqa comments where appropriate to suppress linting warnings for intentional naming patterns.

Key Changes

• Test files (tests/engines/test_adapters.py):

  • Reorganized imports in multiple test methods to follow PEP 8 conventions (stdlib → third-party → local imports)
  • Separated imports with blank lines for better readability
  • Simplified long patch statements by extracting prefix variables to reduce line length
  • Removed unused variable assignment (result = await e.process(...) → await e.process(...))

• Engine files:

  • nougat_engine.py: Reordered imports to group stdlib, third-party, and local imports separately with proper spacing
  • mineru_engine.py: Added # noqa: N814 comments to aliased imports using uppercase naming convention (e.g., _SPM, _FBDW, _PDD) to suppress naming style warnings; reordered imports in _run_mineru method
  • marker_local_engine.py: Renamed import alias from _PC to _PdfConverter for clarity and added # noqa: N814 comment
  • surya_engine.py: Alphabetically sorted imports from the same module (get_page_images, open_pdf)

Notable Details

• All changes are non-functional; they improve code style and maintainability
• The noqa comments are used specifically for intentional uppercase aliases that follow the pattern of importing with underscores to avoid namespace pollution
• Import reorganization follows the standard Python convention: standard library → third-party packages → local imports

https://claude.ai/code/session_01TekPoY1vxh8UTY4TsSs1Fg