This PR introduces a series of improvements to enhance offline asset management and streamline the Windows build/test workflows for the project. The following changes have been made:

Offline Assets:

• Support for offline assets:
  • Added functionality to generate, cache, and restore offline assets in the build process.
  • Integrated offline asset support into pdf2zh using babeldoc.assets.assets.
  • Added test cases to validate offline translation functionality.

GitHub Actions Workflow Updates:

• Windows Executable Build Workflow:

  • Refactored Python version setup and environment variable handling.
  • Integrated caching for dependencies and offline assets metadata.
  • Enhanced artifact management, including compression level adjustments.
  • Included Visual C++ Redistributable installation in the runtime environment.
  • Introduced test modes for both online and offline scenarios.

• Fork Build Workflow:

  • Added offline asset generation and validation steps.
  • Uploaded build artifacts with offline assets for testing purposes.

• Python Publish Workflow:

  • Integrated offline asset preparation for publishable builds.
  • Enhanced repository condition checks and caching logic.

• Python Test Workflow:

  • Included caching for babeldoc assets to optimize dependency handling.
  • Added support for testing offline assets functionality.

Codebase Enhancements:

• Logging Improvements:

  • Introduced RichHandler for enhanced logging output.
  • Suppressed verbose logging for external libraries (e.g., httpx, openai).

• Font Handling Updates:

  • Replaced manual font downloads with utility functions (get_font_and_metadata) for better maintainability.
  • Improved font path resolution for Docker and local environments.

• Refactorings:

  • Simplified ONNX model loading with get_doclayout_onnx_model_path.
  • Clarified warning messages for missing dependencies (e.g., argostranslate).
  • Updated path handling in static scripts to support offline assets restoration.

• Dependency Updates:

  • Updated babeldoc to >=0.1.20.
  • Added rich as a dependency for improved logging.

Dockerfile:

• Disabled font downloads in the Dockerfile to reduce build time.
• Included babeldoc warmup commands for optimized runtime performance.