Match the optional identifiers in every list's search box

gaugelabreference and maintenancereference are collected on the form and shown
on the detail page for all five asset types, and no list's ?search= matched
either. Someone holding a physical tag could read it off the machine, type it
into the list they were already looking at, and get nothing back - while global
search, fixed in the previous commit, found it.

The clause is copy-pasted once per plugin, which is how all five came to omit
fields their own forms collect, so the test is one parametrized pass over all
five lists rather than five per-plugin tests that would drift the same way. It
also pins that widening the clause did not turn the box into a pass-through.

The api-inventory entries enumerate the fields each search matches, so all five
were stale the moment the queries changed; updated with the OpenAPI spec.

Not touched: the collector does not send either identifier, correctly - a
lab-assigned tag is not something an agent on a PC can discover. The legacy
import loader does not map them either, and the classic schema has no
gauge-named column to map from.

plugins/machines/api/routes.py

@@ -189,6 +189,11 @@ def list_machines():
                 Asset.assetnumber.ilike(pattern),
                 Asset.name.ilike(pattern),
                 Asset.serialnumber.ilike(pattern),
+                # The optional identifiers too (ADR-001). Global search matches
+                # these, and a tag read off the machine has to find it here as
+                # well - this box is where someone holding the label looks.
+                Asset.gaugelabreference.ilike(pattern),
+                Asset.maintenancereference.ilike(pattern),
                 MachineType.machinetype.ilike(pattern),
                 Vendor.vendor.ilike(pattern)
             )