feat: wip on login endpoint

- added basic REPR pattern
- added basic vert architecture
- implemented basica validation for single test case

src/FiscalOS.API/Program.cs

@@ -1,5 +1,6 @@
 var builder = WebApplication.CreateBuilder(args);
 
+builder.Services.AddValidation();
 builder.Services.AddOpenApi();
 
 var app = builder.Build();
@@ -11,4 +12,6 @@ if (app.Environment.IsDevelopment())
 
 app.UseHttpsRedirection();
 
+app.MapLoginEndpoint();
+
 app.Run();