feat(saas): implement marketplace and tenant onboarding

Tiku.Api/Contracts/BackgroundJobDtos.cs

@@ -3,11 +3,26 @@ using Tiku.Application.Jobs;
 
 namespace Tiku.Api.Contracts;
 
+/// <summary>
+/// 创建租户后台任务请求。
+/// </summary>
 public sealed class CreateBackgroundJobDto
 {
+    /// <summary>
+    /// 任务类型。
+    /// </summary>
     public string JobType { get; set; } = string.Empty;
+    /// <summary>
+    /// 任务载荷。
+    /// </summary>
     public JsonElement Payload { get; set; }
+    /// <summary>
+    /// 计划运行时间。
+    /// </summary>
     public DateTimeOffset? RunAfter { get; set; }
+    /// <summary>
+    /// 最大重试次数。
+    /// </summary>
     public int MaxRetries { get; set; } = 3;
 
     public CreateBackgroundJobCommand ToCommand(Guid tenantId)