feat(application): repository abstraction + DTOs + validators + handlers CRUD PuntosDeVenta con auditoría + retry deadlock

src/api/SIGCM2.Application/PuntosDeVenta/Reactivate/ReactivatePuntoDeVentaCommandHandler.cs

@@ -0,0 +1,60 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Application.PuntosDeVenta.Deactivate;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.PuntosDeVenta.Reactivate;
+
+public sealed class ReactivatePuntoDeVentaCommandHandler : ICommandHandler<ReactivatePuntoDeVentaCommand, PuntoDeVentaStatusDto>
+{
+    private readonly IPuntoDeVentaRepository _repo;
+    private readonly IMedioRepository _medioRepo;
+    private readonly IAuditLogger _audit;
+
+    public ReactivatePuntoDeVentaCommandHandler(
+        IPuntoDeVentaRepository repo,
+        IMedioRepository medioRepo,
+        IAuditLogger audit)
+    {
+        _repo = repo;
+        _medioRepo = medioRepo;
+        _audit = audit;
+    }
+
+    public async Task<PuntoDeVentaStatusDto> Handle(ReactivatePuntoDeVentaCommand command)
+    {
+        var target = await _repo.GetByIdAsync(command.Id)
+            ?? throw new PuntoDeVentaNotFoundException(command.Id);
+
+        var medio = await _medioRepo.GetByIdAsync(target.MedioId)
+            ?? throw new MedioNotFoundException(target.MedioId);
+
+        if (!medio.Activo)
+            throw new MedioInactivoException(medio.Id);
+
+        // Idempotent: already active → return as-is without writing an audit event
+        if (target.Activo)
+            return new PuntoDeVentaStatusDto(target.Id, target.NumeroAFIP, target.Activo);
+
+        var updated = target.WithActivo(true);
+
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        await _repo.UpdateAsync(updated);
+
+        await _audit.LogAsync(
+            action: "punto_de_venta.reactivate",
+            targetType: "PuntoDeVenta",
+            targetId: command.Id.ToString());
+
+        tx.Complete();
+
+        return new PuntoDeVentaStatusDto(updated.Id, updated.NumeroAFIP, updated.Activo);
+    }
+}