完善套餐与账单接口 & 完善支付数据保存，记录实付价格并关联优惠券

web/globals/orm/timez.go

@@ -0,0 +1,30 @@
+package orm
+
+import (
+	"fmt"
+	"time"
+)
+
+type DateTime struct {
+	time.Time
+}
+
+func (dt *DateTime) Scan(value any) error {
+	switch v := value.(type) {
+	case time.Time:
+		dt.Time = v
+	case string:
+		t, err := time.Parse(time.RFC3339, v)
+		if err != nil {
+			return err
+		}
+		dt.Time = t
+	default:
+		return fmt.Errorf("unsupported type: %T", value)
+	}
+	return nil
+}
+
+func (dt DateTime) Value() (any, error) {
+	return dt.Time.Format(time.RFC3339), nil
+}