test(udt-011): T400.40 — update tests for TimeProvider injection and explicit now params

Fix all test compilation errors caused by T400.10/T400.20/T400.30:
- Handler constructors: add TimeProvider.System as last argument
- Domain mutator calls: add DateTime.UtcNow as explicit 'now' argument
- AuditLogger/SecurityEventLogger Build() helpers: add TimeProvider.System
- JwtService test constructors: add TimeProvider.System
Cat2 coverage already present in TimeProviderArgentinaExtensionsTests.cs:
FakeTimeProvider proves GetArgentinaToday() returns ART civil date, not UTC.

tests/SIGCM2.Application.Tests/Auth/Login/LoginCommandHandlerTests.cs

@@ -44,7 +44,7 @@ public class LoginCommandHandlerTests
         _handler = new LoginCommandHandler(
             _repository, _hasher, _jwtService,
             _refreshRepo, _refreshGenerator, _clientCtx, _authOptions,
-            _rolPermisoRepo, _security, _logger);
+            _rolPermisoRepo, _security, _logger, TimeProvider.System);
     }
 
     // Scenario: valid credentials → returns token response with usuario populated