930b76ecb5
Implemented the ValidatePDF feature end-to-end: - Added `/api/v1/documents/validate` Minimal API endpoint. - Introduced centralized ExceptionHandlingMiddleware. - Configured Swagger with `AddSwaggerDocumentation` extension. - Enabled XML comments in `DocumentOperator.API.csproj`. - Updated DTOs with XML comments and added `FileSizeMB`. - Added integration tests for the ValidatePDF endpoint (3 tests). - Registered infrastructure services (e.g., `IPdfProcessor`). - Refactored `Program.cs` to include middleware and endpoints. - Updated PHASENPLAN.md and ROADMAP.md to reflect progress. - Cleaned up code and made `Program` accessible for tests.