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>

shopdb/plugins/alembic_template.py

@@ -35,7 +35,7 @@ PLUGIN_TABLE_OWNERS: dict[str, Iterable[str]] = {
     'equipment':     ('equipmenttypes', 'equipment'),
     'network':       ('networkdevicetypes', 'networkdevices', 'vlans', 'subnets'),
     'notifications': ('notificationtypes', 'notifications'),
-    'printers':      ('printertypes', 'printers', 'printerdata'),
+    'printers':      ('printertypes', 'printers', 'printerdata', 'modelsupplies'),
     'usb':           ('usbdevicetypes', 'usbdevices', 'usbcheckouts'),
 }