feat: Document timespan in api

Correctly document timespan model in the api documentation.

src/Services/Scheduling/Api/ConfigureServices.cs

@@ -2,6 +2,7 @@
 using KDVManager.Services.Scheduling.Application.Contracts.Services;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.OpenApi.Models;
+using Microsoft.OpenApi.Any;
 
 namespace Microsoft.Extensions.DependencyInjection;
 
@@ -26,6 +27,14 @@ public static IServiceCollection AddApiServices(this IServiceCollection services
                     Email = "[email protected]",
                 },
             });
+
+            // Add a custom schema filter to handle TimeSpan as string with time format
+            options.MapType<TimeSpan>(() => new OpenApiSchema
+            {
+                Type = "string",
+                Format = "time",
+                Example = new OpenApiString("14:30:00")
+            });
         });
 
         services.AddHealthChecks();