refactor: update namespace from MiniPdf to MiniSoftware across all files

Enhance PDF rendering capabilities:

- Improved Excel to PDF conversion by ensuring images are rendered correctly even when they are outside the data area.
- Added support for embedded JPEG and PNG images in PDF pages, including proper handling of image dimensions and rendering.
- Updated PDF writer to accommodate image XObjects, ensuring images are placed correctly in the output PDF.
- Enhanced text extraction and comparison in benchmarks to account for structural differences and improve accuracy in similarity scoring.
- Introduced content-coverage penalties in pixel comparison to better reflect visual differences between rendered PDFs.

Refactor code structure for improved readability and maintainability

Merge pull request #41 from openaitx-system/feature/nuget-package

feat: add NuGet package support