- Introduced `disposeInputStream` parameter in `Pdf<TInputStream, TOutputStream>` constructor.
- Updated `Dispose` and `DisposeAsync` to conditionally dispose the input stream based on this flag.
- Updated `Pdf.FromMemory(MemoryStream)` to not dispose the provided MemoryStream by default.
- Ensures better control over resource management when reusing input streams.
- Introduced Page(Action<PdfPage>) method to apply design logic to every page in the document
- Simplified Background method by replacing per-page iteration with new Page overload
- Improved readability and maintainability by removing duplicate page loop logic
- Added `System.Linq` import to enable distinct and ordered page index selection
- Applied `ConcatMatrix` transformation once per page instead of per signature
- Improved performance and reduced redundant operations in `Background` method
