feat: excluir transações de extrato + delete em lote por mês

Remove restrição que bloqueava delete de transações importadas.
Adiciona DELETE /transactions?month=YYYY-MM para exclusão em lote
e botão "EXCLUIR MÊS" na view de transações.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

apps/api/internal/handler/transaction.go

@@ -60,7 +60,7 @@ func (h *TransactionHandler) Update(w http.ResponseWriter, r *http.Request) {
 	}
 	t.ID = id
 	out, err := h.svc.Update(r.Context(), t)
-	if errors.Is(err, repository.ErrNotFound) || errors.Is(err, service.ErrCannotEditImported) {
+	if errors.Is(err, repository.ErrNotFound) {
 		respondError(w, http.StatusNotFound, err.Error())
 		return
 	}
@@ -83,3 +83,17 @@ func (h *TransactionHandler) Delete(w http.ResponseWriter, r *http.Request) {
 	}
 	w.WriteHeader(http.StatusNoContent)
 }
+
+func (h *TransactionHandler) DeleteByMonth(w http.ResponseWriter, r *http.Request) {
+	month := r.URL.Query().Get("month")
+	if len(month) != 7 {
+		respondError(w, http.StatusBadRequest, "month required (YYYY-MM)")
+		return
+	}
+	count, err := h.svc.DeleteByMonth(r.Context(), month)
+	if err != nil {
+		respondError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	respondJSON(w, http.StatusOK, map[string]int{"deleted": count})
+}