feat: 归档佣金计算触发和快照变更，同步规范文档

- 归档 OpenSpec 变更到 archive 目录
- 创建 2 个新的主规范文件：commission-trigger 和 order-commission-snapshot
- 实现订单佣金快照字段和支付自动触发
- 确保事务一致性，所有佣金操作在同一事务内完成
- 提取成本价计算为公共工具函数

internal/service/order/service_test.go

@@ -124,7 +124,7 @@ func setupOrderTestEnv(t *testing.T) *testEnv {
 	require.NoError(t, tx.Create(wallet).Error)
 
 	purchaseValidationSvc := purchase_validation.New(tx, iotCardStore, deviceStore, packageStore, seriesAllocationStore)
-	orderSvc := New(tx, orderStore, orderItemStore, walletStore, purchaseValidationSvc, nil)
+	orderSvc := New(tx, orderStore, orderItemStore, walletStore, purchaseValidationSvc, nil, nil, nil)
 
 	userCtx := middleware.SetUserContext(ctx, &middleware.UserContextInfo{
 		UserID:   1,