feat: add public tenant packages listing and sort order

src/Application/TakeoutSaaS.Application/App/Tenants/Dto/TenantPackageDto.cs

@@ -74,4 +74,9 @@ public sealed class TenantPackageDto
     /// 是否可售。
     /// </summary>
     public bool IsActive { get; init; }
+
+    /// <summary>
+    /// 展示排序，数值越小越靠前。
+    /// </summary>
+    public int SortOrder { get; init; }
 }