Asset-side printer save, status CRUD, real printer types, network fix

- Printers save through the asset blueprint (PUT /printers) instead of the
  legacy machines API; restrict supply-model picker to printer models.
- Asset statuses get full CRUD (PUT/DELETE with in-use guard); canonical set.
- Printer types reseeded to a real classification set + list filter.
- Equipment accepts gauge/maintenance references.
- Fix network list emitting network_device instead of networkdevice (View 404).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/network/api/routes.py

@@ -207,7 +207,7 @@ def list_network_devices():
     data = []
     for netdev in items:
         item = netdev.asset.to_dict() if netdev.asset else {}
-        item['network_device'] = netdev.to_dict()
+        item['networkdevice'] = netdev.to_dict()
         data.append(item)
 
     return paginated_response(data, page, per_page, total)