feat: add payment order provider snapshots

backend/ent/schema/payment_order.go

@@ -95,6 +95,9 @@ func (PaymentOrder) Fields() []ent.Field {
 			Optional().
 			Nillable().
 			MaxLen(30),
+		field.JSON("provider_snapshot", map[string]any{}).
+			Optional().
+			SchemaType(map[string]string{dialect.Postgres: "jsonb"}),
 
 		// 状态
 		field.String("status").