feat: Add PDF/A validation endpoint (Feature 3)
Domain layer:
- PdfAMetadata value object (isValid, pdfVersion, pageCount, encrypted, pdfaVersion, pdfaCompliant, errors, warnings)
Infrastructure layer:
- IPdfProcessor.ValidatePdfAAsync() interface method
- DevExpressPdfProcessor.ValidatePdfAAsync() implementation
- DetectEncryption() - scans PDF raw data for /Encrypt keyword
- DetectPdfAConformance() - parses XMP metadata (pdfaid:part, pdfaid:conformance)
- Validation: encrypted PDF cannot be PDF/A compliant
Application layer:
- ValidatePdfAQuery + ValidatePdfAQueryHandler (co-located)
- ValidatePdfAQueryValidator (FluentValidation: PdfBytes XOR Base64Pdf)
- PdfAValidationResult DTO
- AutoMapper: PdfAMetadata -> PdfAValidationResult
API layer:
- PdfValidationController.ValidatePdfAFromFile() (multipart/form-data)
- PdfValidationController.ValidatePdfAFromBase64() (application/json)
- XML documentation with response codes
Result:
- POST /api/pdf/validation/validate-pdfa (both multipart and JSON)
- Returns: conformance level, errors, warnings
- Build: 0 errors, 4 warnings (DevExpress eval)
- Tests: 20/20 passing
Next: Integration tests + Swagger test case
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