feat(application): RubroTreeBuilder + GetRubroTree con tieneAvisos (CAT-002)

src/api/SIGCM2.Application/Rubros/GetTree/GetRubroTreeQueryHandler.cs

@@ -8,16 +8,20 @@ namespace SIGCM2.Application.Rubros.GetTree;
 public sealed class GetRubroTreeQueryHandler : ICommandHandler<GetRubroTreeQuery, IReadOnlyList<RubroTreeNodeDto>>
 {
     private readonly IRubroRepository _repo;
+    private readonly IAvisoQueryRepository _avisoQuery;
 
-    public GetRubroTreeQueryHandler(IRubroRepository repo)
+    public GetRubroTreeQueryHandler(IRubroRepository repo, IAvisoQueryRepository avisoQuery)
     {
         _repo = repo;
+        _avisoQuery = avisoQuery;
     }
 
     public async Task<IReadOnlyList<RubroTreeNodeDto>> Handle(GetRubroTreeQuery query)
     {
         var all = await _repo.GetAllAsync(query.IncluirInactivos);
-        // CAT-002: avisoCounts injected via IAvisoQueryRepository (wired in Batch 6)
-        return RubroTreeBuilder.Build(all, query.IncluirInactivos, new Dictionary<int, int>());
+        var ids = all.Select(r => r.Id).ToList();
+        // CAT-002: single batch call — avoids N+1 when PRD-002 activates the real implementation
+        var avisoCounts = await _avisoQuery.CountAvisosBatchAsync(ids);
+        return RubroTreeBuilder.Build(all, query.IncluirInactivos, avisoCounts);
     }
 }