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.
- Add Origin parameter (default: BottomLeft)
- Add Width/Height as alternatives to X2/Y2
- Validation: Either (X2+Y2) OR (Width+Height) required, not both
- FluentValidation rules enforce mutual exclusivity
- Create AddAnnotationCommand (Command/Handler/Validator merged in single file)
- Use primary constructors for handler (IPdfProcessor dependency)
- FluentValidation rules: stream required, pageNumber > 0, content for FreeText/StickyNote
- Validate textMarkupStyle required for TextMarkup annotations
- Validate color format (6-digit hex) and rectangle coordinates (X2>X1, Y2>Y1)
