Add DiscountAmount column to Invoices table

Distribution/Migrations/AppDBContextModelSnapshot.cs

@@ -848,6 +848,9 @@ namespace Distribution.Migrations
                     b.Property<Guid>("CreatedBy")
                         .HasColumnType("char(36)");
 
+                    b.Property<decimal>("DiscountAmount")
+                        .HasColumnType("decimal(65,30)");
+
                     b.Property<Guid>("FK_ShopPOId")
                         .HasColumnType("char(36)");
 
@@ -887,6 +890,7 @@ namespace Distribution.Migrations
                             Id = new Guid("34500000-0000-0000-0000-000000000001"),
                             CreatedAt = new DateTime(2026, 8, 25, 8, 30, 0, 0, DateTimeKind.Unspecified),
                             CreatedBy = new Guid("29000000-0000-0000-0000-000000000002"),
+                            DiscountAmount = 0m,
                             FK_ShopPOId = new Guid("33000000-0000-0000-0000-000000000001"),
                             FinalizedAt = new DateTime(2026, 8, 25, 9, 0, 0, 0, DateTimeKind.Unspecified),
                             FinalizedBy = new Guid("29000000-0000-0000-0000-000000000001"),
@@ -902,6 +906,7 @@ namespace Distribution.Migrations
                             Id = new Guid("34500000-0000-0000-0000-000000000002"),
                             CreatedAt = new DateTime(2026, 8, 31, 9, 0, 0, 0, DateTimeKind.Unspecified),
                             CreatedBy = new Guid("29000000-0000-0000-0000-000000000003"),
+                            DiscountAmount = 0m,
                             FK_ShopPOId = new Guid("33000000-0000-0000-0000-000000000003"),
                             IsActive = true,
                             PaymentStatus = 1,