Every briefing topic with its count, the newest items across all of them and the subscription state.

Topics are public bookmark folders (CUDA, inference, RAG, agents…). Each item is a post someone saved, its main source, the source type and a two-line summary in English and Portuguese. ?resumo=1 returns only total and each topic's slug and total. 404 until the first publication. Returns: { total, atualizado_em, topicos[{slug,nome,descricao,total,atualizado_em,tipos,api?,pagina?}], recentes[{id,slug,data,autor,post,fonte,tipo,previa?,titulo,resumo,importa}], inscricao, _links }