Initial commit

src/PowderCoating.Core/Entities/InAppNotification.cs

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+namespace PowderCoating.Core.Entities;
+
+public class InAppNotification : BaseEntity
+{
+    public string Title { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public string? Link { get; set; }
+    public string NotificationType { get; set; } = string.Empty; // QuoteApproved, QuoteDeclined, InvoicePaid
+    public bool IsRead { get; set; }
+    public DateTime? ReadAt { get; set; }
+
+    // Optional FK links for context
+    public int? QuoteId { get; set; }
+    public int? InvoiceId { get; set; }
+    public int? CustomerId { get; set; }
+
+    // Navigation
+    public virtual Quote? Quote { get; set; }
+    public virtual Invoice? Invoice { get; set; }
+    public virtual Customer? Customer { get; set; }
+}