chore(udt-011): register DateOnlyJsonConverter in Program.cs AddJsonOptions

src/api/SIGCM2.Api/Program.cs

@@ -2,12 +2,13 @@ using Microsoft.AspNetCore.Authorization;
 using Serilog;
 using Scalar.AspNetCore;
 using SIGCM2.Api.Authorization;
+using SIGCM2.Api.Filters;
 using SIGCM2.Api.HealthChecks;
+using SIGCM2.Api.Json;
 using SIGCM2.Api.Middleware;
 using SIGCM2.Application;
 using SIGCM2.Infrastructure;
 using SIGCM2.Infrastructure.Audit.Jobs;
-using SIGCM2.Api.Filters;
 
 // Bootstrap logger — before DI is built
 Log.Logger = new LoggerConfiguration()
@@ -36,10 +37,15 @@ builder.Services.AddAuthorization();
 builder.Services.AddScoped<IAuthorizationHandler, PermissionAuthorizationHandler>();
 builder.Services.AddSingleton<IAuthorizationMiddlewareResultHandler, ForbiddenProblemDetailsHandler>();
 
-// Controllers with exception filter
+// Controllers with exception filter + JSON options
+// UDT-011: DateOnlyJsonConverter ensures Cat2 date fields serialize as "yyyy-MM-dd"
+// and never as "2026-05-01T00:00:00" or with a UTC "Z" suffix.
 builder.Services.AddControllers(opts =>
 {
     opts.Filters.Add<ExceptionFilter>();
+}).AddJsonOptions(jsonOpts =>
+{
+    jsonOpts.JsonSerializerOptions.Converters.Add(new DateOnlyJsonConverter());
 });
 
 // OpenAPI / Scalar