Clean up kind handling in the front

back/src/Kyoo.Abstractions/Models/Resources/User.cs

@@ -17,7 +17,6 @@
 // along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
 
 using System;
-using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using Kyoo.Abstractions.Controllers;
 using Kyoo.Abstractions.Models.Attributes;

back/src/Kyoo.Authentication/Views/AuthApi.cs

@@ -18,7 +18,6 @@
 
 using System;
 using System.Linq;
-using System.Security.Claims;
 using System.Threading.Tasks;
 using Kyoo.Abstractions.Controllers;
 using Kyoo.Abstractions.Models;

back/src/Kyoo.Core/Views/Helper/Serializers/JsonSerializerContract.cs

@@ -25,6 +25,7 @@ using Kyoo.Abstractions.Models.Attributes;
 using Microsoft.AspNetCore.Http;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
+using static System.Text.Json.JsonNamingPolicy;
 
 namespace Kyoo.Core.Api
 {
@@ -99,7 +100,7 @@ namespace Kyoo.Core.Api
 						PropertyName = "kind",
 						UnderlyingName = "kind",
 						PropertyType = typeof(string),
-						ValueProvider = new FixedValueProvider(type.Name),
+						ValueProvider = new FixedValueProvider(CamelCase.ConvertName(type.Name)),
 						Readable = true,
 						Writable = false,
 						TypeNameHandling = TypeNameHandling.None,