Initial commit

src/PowderCoating.Core/Entities/BaseEntity.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Base entity class that all domain entities inherit from
+/// </summary>
+public abstract class BaseEntity
+{
+    public int Id { get; set; }
+
+    // Multi-tenancy
+    public int CompanyId { get; set; }
+
+    // Audit fields
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+    public string? CreatedBy { get; set; }
+    public string? UpdatedBy { get; set; }
+
+    // Soft delete
+    public bool IsDeleted { get; set; } = false;
+    public DateTime? DeletedAt { get; set; }
+    public string? DeletedBy { get; set; }
+}