test: Add PDF/A validation tests and manual testing guide
- Add unit tests for ValidatePdfAQueryHandler (4 tests)
- Add integration tests for PDF/A validation endpoint (6 tests)
- Fix FluentValidation: Add Base64 format validation to ValidatePdfAQueryValidator
- Update AGENTS.md: Document 3-folder test structure rationale and test count (30 tests)
- Add DocumentOperator.API/README.md: 16 manual test scenarios for all endpoints
Test coverage:
- Unit: ValidatePdfAQueryHandler (compliant, non-compliant, encrypted, exceptions)
- Integration: PDF/A endpoint (multipart + Base64, validation, error handling)
- Manual: Step-by-step Swagger UI testing guide for all features
All 30 automated tests passing.
TekH
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