fix(backend): make API types internal

backend/src/Socialize.Api/Modules/Channels/Handlers/CreateChannel.cs

@@ -6,14 +6,14 @@ using Socialize.Api.Modules.Channels.Data;
 
 namespace Socialize.Api.Modules.Channels.Handlers;
 
-public record CreateChannelRequest(
+internal record CreateChannelRequest(
     Guid WorkspaceId,
     string Name,
     string Network,
     string? Handle,
     string? ExternalUrl);
 
-public class CreateChannelRequestValidator
+internal class CreateChannelRequestValidator
     : Validator<CreateChannelRequest>
 {
     private static readonly string[] AllowedNetworks =
@@ -39,7 +39,7 @@ public class CreateChannelRequestValidator
     }
 }
 
-public class CreateChannelHandler(
+internal class CreateChannelHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService)
     : Endpoint<CreateChannelRequest, ChannelDto>