feat(domain): BATCH 2 - Permiso entity + catalogo const [UDT-005]

src/api/SIGCM2.Domain/Exceptions/PermisoNotFoundException.cs

@@ -0,0 +1,12 @@
+namespace SIGCM2.Domain.Exceptions;
+
+public sealed class PermisoNotFoundException : Exception
+{
+    public string Codigo { get; }
+
+    public PermisoNotFoundException(string codigo)
+        : base($"El permiso '{codigo}' no existe.")
+    {
+        Codigo = codigo;
+    }
+}