Carry the level everywhere a position is drawn, and gate it per occurrence

The hover mini-map said "This asset has a position (2835, 1410) but no level"
for every asset in the product. When 0.11.0 gave LocationMapTooltip a levelid
prop, NONE of its seven call sites were taught to pass one - printer, machine and
PC detail pages, the toner report, enforcement reports, the warranty chip and the
dashboard cards - so the component correctly reported a missing level and the
preview never drew. Two payloads behind those views also emitted mapx/mapy with
no level: the toner report and the enforcement report.

The map PDF export had the ORIGINAL bug still in it: it plotted every filtered
asset onto the sheet, so exporting the ground floor printed second-floor markers
on it. Worse than on screen, because nobody can correct a sheet once it has been
printed and carried onto the floor. It now exports only the level being viewed.

The legacy import loader sent mapleft/maptop with no level at three call sites.
That loader is the one still to run against production, and every marker it
created would have been undrawable. It now resolves the site's default level -
the legacy schema predates levels and has one floor plan, so that is what its
coordinates mean.

THE GATE MISSED ALL OF THIS because it asked whether a FILE mentions 'levelid',
not whether each position does: one module emitted 'mapx' six times and 'levelid'
once and passed. It now checks per occurrence, covers scripts/ as well as shopdb/
and plugins/, and fails any Vue file that binds tooltip coordinates without
:levelid. Both new rules were confirmed to fail the build against planted
violations before being relied on.

Printer QR labels: the asset number is no longer printed. A label now reads name
(8201-HPLaserJetPro), QR, FQDN, then IP. The name falls back to the assetnumber
because that is where sites actually keep it - every printer here has an empty
name field, so preferring the Windows queue name alone would have printed a blank
line on every label.

plugins/computers/frontend/views/PCDetail.vue

@@ -185,6 +185,7 @@
                     v-if="computer.mapx != null && computer.mapy != null"
                     :left="computer.mapx"
                     :top="computer.mapy"
+                    :levelid="computer.levelid"
                     :machineName="computer.assetnumber"
                   >
                     <span class="location-link">{{ computer.locationname || 'On Map' }}</span>