Merged in feature/track-filesize (pull request #200)

track file sizes for all documents in system

* feature complete

needs dev testing

internal/folder/service.go

@@ -248,6 +248,7 @@ type DocumentInFolder struct {
 	OriginalPath  *string
 	Labels        []LabelRecord
 	TextRecord    *TextRecord // Only populated when includeTextRecord=true
+	FileSizeBytes *int64      // File size in bytes (nil for legacy documents)
 }
 
 // LabelRecord represents a label applied to a document.
@@ -368,6 +369,7 @@ func (s *Service) GetDocumentsEnriched(ctx context.Context, folderID uuid.UUID,
 			OriginalPath:  doc.Originalpath,
 			Labels:        labels,
 			TextRecord:    textRecordsMap[doc.ID],
+			FileSizeBytes: doc.FileSizeBytes,
 		}
 	}