fix(backend): make API types internal

backend/src/Socialize.Api/Modules/Campaigns/Handlers/GetCampaigns.cs

@@ -6,9 +6,9 @@ using Socialize.Api.Modules.Campaigns.Data;
 
 namespace Socialize.Api.Modules.Campaigns.Handlers;
 
-public record GetCampaignsRequest(Guid? WorkspaceId, Guid? ClientId);
+internal record GetCampaignsRequest(Guid? WorkspaceId, Guid? ClientId);
 
-public record CampaignDto(
+internal record CampaignDto(
     Guid Id,
     Guid WorkspaceId,
     Guid ClientId,
@@ -19,7 +19,7 @@ public record CampaignDto(
     DateTimeOffset StartDate,
     DateTimeOffset EndDate);
 
-public class GetCampaignsHandler(
+internal class GetCampaignsHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService)
     : Endpoint<GetCampaignsRequest, IReadOnlyCollection<CampaignDto>>