feat: 审核通过时按月续费订阅

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/ReviewTenantCommand.cs

@@ -24,4 +24,9 @@ public sealed record ReviewTenantCommand : IRequest<TenantDto>
     /// 审核备注或拒绝原因。
     /// </summary>
     public string? Reason { get; init; }
+
+    /// <summary>
+    /// 审核通过后续费时长（月）。
+    /// </summary>
+    public int? RenewMonths { get; init; }
 }

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/ReviewTenantCommandHandler.cs

@@ -53,11 +53,44 @@ public sealed class ReviewTenantCommandHandler(
         // 4. 更新租户与订阅状态
         if (request.Approve)
         {
+            var renewMonths = request.RenewMonths ?? 0;
+            if (renewMonths <= 0)
+            {
+                throw new BusinessException(ErrorCodes.ValidationFailed, "续费时长必须为正整数（月）");
+            }
+
             verification.Status = TenantVerificationStatus.Approved;
             tenant.Status = TenantStatus.Active;
             if (subscription != null)
             {
                 subscription.Status = SubscriptionStatus.Active;
+
+                var now = DateTime.UtcNow;
+                if (subscription.EffectiveFrom == default || subscription.EffectiveFrom > now)
+                {
+                    subscription.EffectiveFrom = now;
+                }
+
+                var previousEffectiveTo = subscription.EffectiveTo;
+                var baseEffectiveTo = subscription.EffectiveTo > now ? subscription.EffectiveTo : now;
+                subscription.EffectiveTo = baseEffectiveTo.AddMonths(renewMonths);
+                subscription.NextBillingDate = subscription.EffectiveTo;
+
+                await tenantRepository.AddAuditLogAsync(new Domain.Tenants.Entities.TenantAuditLog
+                {
+                    TenantId = tenant.Id,
+                    Action = TenantAuditAction.SubscriptionUpdated,
+                    Title = "订阅续费",
+                    Description = $"续费 {renewMonths} 月，到期时间：{previousEffectiveTo:yyyy-MM-dd HH:mm:ss} -> {subscription.EffectiveTo:yyyy-MM-dd HH:mm:ss}",
+                    OperatorId = currentUserAccessor.UserId == 0 ? null : currentUserAccessor.UserId,
+                    OperatorName = actorName,
+                    PreviousStatus = previousStatus,
+                    CurrentStatus = tenant.Status
+                }, cancellationToken);
+            }
+            else
+            {
+                throw new BusinessException(ErrorCodes.BadRequest, "订阅不存在，无法续费");
             }
         }
         else