Initial commit

src/PowderCoating.Core/Entities/AuditLog.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Platform-wide audit trail. Not a BaseEntity — no soft delete, no tenant filter.
+/// </summary>
+public class AuditLog
+{
+    public long Id { get; set; }
+
+    // Who
+    public string? UserId { get; set; }
+    public string UserName { get; set; } = "System";
+    public int? CompanyId { get; set; }
+    public string? CompanyName { get; set; }
+
+    // What
+    public string Action { get; set; } = string.Empty;      // Created | Updated | Deleted | Restored | Login | ManualChange
+    public string EntityType { get; set; } = string.Empty;  // Customer | Job | Quote | …
+    public string? EntityId { get; set; }
+    public string? EntityDescription { get; set; }          // Human-readable label (e.g. "JOB-2501-0042")
+
+    // Change detail (JSON)
+    public string? OldValues { get; set; }
+    public string? NewValues { get; set; }
+
+    // Context
+    public string? IpAddress { get; set; }
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+}