Initial commit

src/PowderCoating.Core/Entities/JobChangeHistory.cs

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+namespace PowderCoating.Core.Entities;
+
+public class JobChangeHistory : BaseEntity
+{
+    public int JobId { get; set; }
+    public string? ChangedByUserId { get; set; }
+    public DateTime ChangedAt { get; set; } = DateTime.UtcNow;
+    public string FieldName { get; set; } = string.Empty;
+    public string? OldValue { get; set; }
+    public string? NewValue { get; set; }
+    public string ChangeDescription { get; set; } = string.Empty;
+
+    // Navigation properties
+    public Job Job { get; set; } = null!;
+    public ApplicationUser? ChangedBy { get; set; }
+}