List every input layer row of a project, per kind, with whether it has features.

For each of boundary, friction, inflow, rainfall, building and mesh_region: the rows (row_id, title, gn_layer — the dataset pk — and dataset_alternate, the workspace:name WFS typename) and has_features. has_features comes from the API for boundary, rainfall and mesh_region; for friction, inflow and building (whose records do not carry it) it is a WFS feature count, at most 24 lookups per call — past that, or when a lookup fails, it is null (unknown, not false). A row with no gn_layer has no layer yet (has_features false). Use the row ids with create_scenario; this is the listing primitive — no need to probe files.