Implemented DLSiteClient.

JSMR.Infrastructure/Integrations/DLSite/Models/RelatedProductSeries.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+
+namespace JSMR.Infrastructure.Integrations.DLSite.Models;
+
+public class RelatedProductSeries
+{
+    [JsonPropertyName("data")]
+    public RelatedProductSeriesData? Data { get; set; }
+
+    [JsonPropertyName("status")]
+    public string? Status { get; set; }
+
+    [JsonPropertyName("msg")]
+    public string? Message { get; set; }
+}