feat: 激活码与VIP充值支持按天计费

- 新增 VIP 天数概念，支持月数与天数组合计算过期时间
- 激活码商品新增 VipDays 配置，并新增 1 天会员试用组合包
- VIP 充值统一按天数计算（1 个月 = 31 天），兼容原有逻辑
- 激活码兑换时支持仅天数或天月组合的 VIP 充值

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/ActivationCodeService.cs

@@ -92,7 +92,7 @@ public class ActivationCodeService : ApplicationService, IActivationCodeService
                 isCreateRechargeRecord: !goods.IsCombo);
         }
 
-        if (goods.VipMonths > 0)
+        if (goods.VipMonths > 0 || goods.VipDays > 0)
         {
             await _rechargeService.RechargeVipAsync(new RechargeCreateInput
             {
@@ -100,6 +100,7 @@ public class ActivationCodeService : ApplicationService, IActivationCodeService
                 RechargeAmount = totalAmount,
                 Content = packageName,
                 Months = goods.VipMonths,
+                Days = goods.VipDays,
                 Remark = "激活码兑换",
                 ContactInfo = null
             });