refactor: remove PdfMetadata/PdfAMetadata, use result DTOs directly

PdfMetadata and PdfAMetadata were redundant intermediate classes that
mirrored PdfValidationResult and PdfAValidationResult exactly.

Changes:
- Delete PdfMetadata.cs and PdfAMetadata.cs
- IPdfProcessor.ValidateAsync now returns PdfValidationResult directly
- IPdfProcessor.ValidatePdfAAsync now returns PdfAValidationResult directly
- ValidatePdfQueryHandler: remove IMapper dependency, return result directly
- ValidatePdfAQueryHandler: remove IMapper dependency, return result directly
- MappingProfile: remove the two now-obsolete CreateMap calls
- PdfValidationResult: add IsEncrypted parameter (was missing)

DocumentOperator.Application/Common/DTOs/PdfAMetadata.cs

@@ -1,34 +0,0 @@
-namespace DocumentService.Application.Common.DTOs;
-
-/// <summary>
-/// PDF/A validation metadata including conformance level and validation errors/warnings
-/// </summary>
-public sealed class PdfAMetadata(
-    bool isValid,
-    string pdfVersion,
-    int pageCount,
-    long fileSizeBytes,
-    bool encrypted,
-    string? pdfaVersion,
-    bool pdfaCompliant,
-    IReadOnlyList<string> errors,
-    IReadOnlyList<string> warnings)
-{
-    public bool IsValid { get; } = isValid;
-    public string PdfVersion { get; } = pdfVersion;
-    public int PageCount { get; } = pageCount;
-    public long FileSizeBytes { get; } = fileSizeBytes;
-    public bool Encrypted { get; } = encrypted;
-    public string? PdfAVersion { get; } = pdfaVersion;
-    public bool PdfACompliant { get; } = pdfaCompliant;
-    public IReadOnlyList<string> Errors { get; } = errors;
-    public IReadOnlyList<string> Warnings { get; } = warnings;
-
-    // Computed property
-    public double FileSizeMB => FileSizeBytes / 1024.0 / 1024.0;
-
-    public override string ToString()
-    {
-        return $"PDF/A: {PdfAVersion ?? "None"}, {PageCount} pages, {FileSizeMB:F2} MB, Compliant: {PdfACompliant}";
-    }
-}

DocumentOperator.Application/Common/DTOs/PdfMetadata.cs

@@ -1,23 +0,0 @@
-namespace DocumentService.Application.Common.DTOs;
-
-public sealed class PdfMetadata(
-    int pageCount,
-    long fileSizeBytes,
-    string pdfVersion,
-    bool hasAttachments,
-    int attachmentCount)
-{
-    public int PageCount { get; } = pageCount;
-    public long FileSizeBytes { get; } = fileSizeBytes;
-    public string PdfVersion { get; } = pdfVersion;
-    public bool HasAttachments { get; } = hasAttachments;
-    public int AttachmentCount { get; } = attachmentCount;
-
-    // Computed Property (berechnet aus FileSizeBytes)
-    public double FileSizeMB => FileSizeBytes / 1024.0 / 1024.0;
-
-    public override string ToString()
-    {
-        return $"PDF: {PageCount} pages, {FileSizeMB:F2} MB, Version {PdfVersion}, Attachments: {AttachmentCount}";
-    }
-}

DocumentOperator.Application/Common/DTOs/PdfValidationResult.cs

@@ -9,10 +9,12 @@ namespace DocumentService.Application.Common.DTOs;
 /// <param name="PdfVersion">PDF-Version (z.B. "1.4")</param>
 /// <param name="HasAttachments">Hat das PDF Anhänge?</param>
 /// <param name="AttachmentCount">Anzahl der Anhänge</param>
+/// <param name="IsEncrypted">Ist das PDF passwortgeschützt/verschlüsselt?</param>
 public record PdfValidationResult(
     int PageCount,
     long FileSizeBytes,
     double FileSizeMB,
     string PdfVersion,
     bool HasAttachments,
-    int AttachmentCount);
+    int AttachmentCount,
+    bool IsEncrypted);

DocumentOperator.Application/Common/Interfaces/IPdfProcessor.cs

@@ -15,7 +15,7 @@ public interface IPdfProcessor
     /// <exception cref="Domain.Common.Exceptions.BadRequestException">
     /// Thrown when stream is empty, invalid, or not positioned at the beginning
     /// </exception>
-    Task<PdfMetadata> ValidateAsync(Stream pdfStream);
+    Task<PdfValidationResult> ValidateAsync(Stream pdfStream);
 
     /// <summary>
     /// Validates a PDF/A document and checks conformance level.
@@ -28,7 +28,7 @@ public interface IPdfProcessor
     /// <exception cref="Domain.Common.Exceptions.BadRequestException">
     /// Thrown when stream is empty, invalid, or not positioned at the beginning
     /// </exception>
-    Task<PdfAMetadata> ValidatePdfAAsync(Stream pdfStream);
+    Task<PdfAValidationResult> ValidatePdfAAsync(Stream pdfStream);
 
     /// <summary>
     /// Checks for embedded files (attachments) in a PDF document and returns detailed metadata.

DocumentOperator.Application/Common/Mapping/MappingProfile.cs

@@ -13,12 +13,6 @@ public class MappingProfile : Profile
 {
     public MappingProfile()
     {
-        // PdfMetadata -> PdfValidationResult
-        CreateMap<PdfMetadata, PdfValidationResult>();
-
-        // PdfAMetadata -> PdfAValidationResult
-        CreateMap<PdfAMetadata, PdfAValidationResult>()
-            .ForMember(dest => dest.FileSize, opt => opt.MapFrom(src => src.FileSizeBytes));
 
         // Codecrete Bill -> SwissQrBillDto
         CreateMap<Bill, SwissQrBillDto>()