This commit implements a complete rebranding of the project:
- Updated all namespaces from `DocumentOperator` to `DocumentService`.
- Renamed file paths, embedded resources, and test data references.
- Updated configuration keys, logging paths, and Redis instance names.
- Revised documentation to reflect the new project name.
- Modified project and solution files to align with the new structure.
- Updated class names, DTOs, commands, queries, and handlers.
- Adjusted middleware, controllers, and API endpoints.
- Updated Swagger metadata and API titles to `DocumentService API`.
- Refactored test namespaces, resource paths, and embedded resources.
- Updated build and deployment configurations for the new name.
- Replaced all references to `DocumentOperator` in comments and literals.
These changes ensure consistency across the codebase and documentation.
Introduced endpoints for embedding attachments in PDFs and converting
between standard PDFs and PDF/A formats. Added `PdfAttachmentController`
and `PdfConversionController` with multipart/form-data and Base64-based
support. Implemented commands, handlers, and validators for these
operations.
Extended `IPdfProcessor` with methods for adding attachments and
PDF/A conversion. Partially implemented functionality in
`DevExpressPdfProcessor`, including `ConvertFromPdfAAsync`.
Added `attachment.xml` and `withoutAttachment.pdf` as resources for
testing. Marked endpoints as `[Obsolete]` to indicate incomplete
implementation. Improved validation and error handling for commands.
