- Replace obsolete DocumentController implementation using EnvelopeOldService and direct dependencies
- Migrate to MediatR-based query handling via ReadEnvelopeReceiverAsync
- Remove obsolete constructors and actions marked for deprecation
- Add proper error handling with NotFoundException for missing envelope or document data
- Improve logging with structured JSON output for diagnostics
- Update base class from BaseController to ControllerBase and add ApiController attribute
- Rename action to GetDocument and apply explicit HttpGet routing
- Use IMediator for clean separation of concerns and alignment with CQRS pattern
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