feature: Optional OCR-Assisted Draft Pre-Fill

VigilCareRecordsAPI/Domain/Entities/OcrResult.cs

@@ -0,0 +1,12 @@
+public class OcrResult
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public string Provider { get; set; } = null!;       // "azure" or "tesseract"
+    public string FieldConfidencesJson { get; set; } = null!;  // serialized Dictionary<string, double>
+    public string? RawText { get; set; }
+    public int DurationMs { get; set; }
+    public DateTimeOffset ProcessedAt { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+}

VigilCareRecordsAPI/Domain/Enums/DigitizationEventType.cs

@@ -22,7 +22,10 @@ public enum DigitizationEventType
     DocumentAccessed,
     Cancelled,
     DraftFieldUpdated,
-    DraftObservationDeleted
+    DraftObservationDeleted,
+    OcrStarted,
+    OcrCompleted,
+    OcrFailed
 }
 
 public static class DigitizationEventTypeExtensions
@@ -52,6 +55,9 @@ public static class DigitizationEventTypeExtensions
         DigitizationEventType.Cancelled                   => "cancelled",
         DigitizationEventType.DraftFieldUpdated            => "draft_field_updated",
         DigitizationEventType.DraftObservationDeleted      => "draft_observation_deleted",
+        DigitizationEventType.OcrStarted                   => "ocr_started",
+        DigitizationEventType.OcrCompleted                 => "ocr_completed",
+        DigitizationEventType.OcrFailed                    => "ocr_failed",
         _ => throw new ArgumentOutOfRangeException(nameof(t))
     };
 
@@ -80,6 +86,9 @@ public static class DigitizationEventTypeExtensions
         "cancelled"                  => DigitizationEventType.Cancelled,
         "draft_field_updated"        => DigitizationEventType.DraftFieldUpdated,
         "draft_observation_deleted"  => DigitizationEventType.DraftObservationDeleted,
+        "ocr_started"                => DigitizationEventType.OcrStarted,
+        "ocr_completed"              => DigitizationEventType.OcrCompleted,
+        "ocr_failed"                 => DigitizationEventType.OcrFailed,
         _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown digitization event type: '{v}'")
     };
 }