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.
Added `CONTROLLER_ENDPOINTS.md` to define REST API endpoints and
`REQUIRED_FEATURES.md` to outline required functions and features
for the `DocumentOperator` service. These documents include
detailed specifications for controllers, input/output formats,
usage scenarios, and technical requirements.
Updated `DocumentOperator.sln` to include the new documentation
files under a "Solution Items" section for better visibility.
Defined a prioritization strategy for feature implementation,
technical requirements, and a comprehensive test strategy.
Referenced relevant standards (e.g., PDF/A, ZUGFeRD) and
documented usage of the DevExpress Office File API.
