Trash icon in the library was firing PATCH /assets/:id with {status:"deleted"}. The PATCH route only accepts display_name/tags/notes so it returned "No fields to update" and the asset stayed put.
* api.js: add deleteAsset(id, {hard}) helper hitting the real DELETE route.
* index.html: deleteAssetPrompt now calls deleteAsset (soft archive). Confirm dialog reworded to match.
* mam-api/routes/assets.js: list endpoint hides status=archived by default. Pass ?include_archived=true to see them in a future restore-from-trash view. Filtering by ?status=archived still works for power users.
* All HTML: bump api.js cache-buster v=4 -> v=5 so the new helper is fetched.
