Implemented DLSiteClient.

JSMR.Infrastructure/Integrations/DLSite/Serialization/ProductInfoOptionsConverter.cs

@@ -0,0 +1,22 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace JSMR.Infrastructure.Integrations.DLSite.Serialization;
+
+public sealed class ProductInfoOptionsConverter : JsonConverter<string[]>
+{
+    public override string[] Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        string value = reader.GetString() ?? string.Empty;
+
+        if (string.IsNullOrEmpty(value))
+            return [];
+
+        return [.. value.Split('#')];
+    }
+
+    public override void Write(Utf8JsonWriter writer, string[] value, JsonSerializerOptions options)
+    {
+        writer.WriteStringValue(string.Join("#", value));
+    }
+}