feat(application): Rubros commands/queries + RubroTreeBuilder + audit (CAT-001)

src/api/SIGCM2.Application/Rubros/Deactivate/DeactivateRubroCommandHandler.cs

@@ -0,0 +1,58 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Rubros.Deactivate;
+
+public sealed class DeactivateRubroCommandHandler : ICommandHandler<DeactivateRubroCommand, RubroStatusDto>
+{
+    private readonly IRubroRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public DeactivateRubroCommandHandler(
+        IRubroRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<RubroStatusDto> Handle(DeactivateRubroCommand command)
+    {
+        var target = await _repo.GetByIdAsync(command.Id)
+            ?? throw new RubroNotFoundException(command.Id);
+
+        var activeChildren = await _repo.CountActiveChildrenAsync(command.Id);
+        if (activeChildren > 0)
+            throw new RubroTieneHijosActivosException(command.Id, activeChildren);
+
+        var deactivated = target.WithActivo(false, _timeProvider);
+
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        await _repo.UpdateAsync(deactivated);
+
+        await _audit.LogAsync(
+            action: "rubro.deleted",
+            targetType: "Rubro",
+            targetId: command.Id.ToString(),
+            metadata: new
+            {
+                rubroId = command.Id,
+                nombre = target.Nombre,
+                activeChildrenCount = 0,
+            });
+
+        tx.Complete();
+
+        return new RubroStatusDto(Id: deactivated.Id, Activo: deactivated.Activo);
+    }
+}