WIP: Record history

DiunaBI.Application/DTOModels/RecordHistoryDto.cs

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+namespace DiunaBI.Application.DTOModels;
+
+public class RecordHistoryDto
+{
+    public Guid Id { get; set; }
+    public Guid RecordId { get; set; }
+    public Guid LayerId { get; set; }
+
+    // When and who
+    public DateTime ChangedAt { get; set; }
+    public Guid ChangedById { get; set; }
+    public string ChangedByName { get; set; } = string.Empty;
+
+    // Type of change
+    public string ChangeType { get; set; } = string.Empty; // "Created", "Updated", "Deleted"
+
+    // Snapshot values
+    public string Code { get; set; } = string.Empty;
+    public string? Desc1 { get; set; }
+
+    // What changed
+    public string? ChangedFields { get; set; } // "Code, Desc1"
+    public string? ChangesSummary { get; set; } // JSON: {"Code": {"old": "A", "new": "B"}}
+
+    // Formatted display text
+    public string FormattedChange { get; set; } = string.Empty;
+}