Buildings and levels for the floor map, and make every identifier searchable

The map was one picture of one floor. A second floor was added, the blueprint
changed size, and machines moved, so a position now records WHICH DRAWING its
coordinates belong to.

Buildings and levels (ADR-017). Each level owns its blueprint per theme and its
own native pixel size; assets.mapx/mapy are pixels of assets.levelid, not of the
site. A position whose level is unknown renders "level unknown" and is never
drawn on the default level, because a marker on the wrong floor plan looks
entirely correct while pointing at the wrong place.

Repositioning in bulk: filter by unplaced, needs-review or level, search, place,
confirm. Landmark recalibration solves the transform PER AXIS from landmark
pairs and never from image dimensions - the canvas grew taller without
rescaling, so a dimension-derived scale would stretch Y by 1.57 and be wrong
everywhere. It defaults to a dry run, reports what would land off the drawing,
snapshots before applying, and clears mapverifiedat because a transform is a
guess awaiting review. Snapshots restore, including the level and the review
state, and a restore snapshots first so an undo is undoable.

Search: gaugelabreference was matched only for measuring tools and
maintenancereference was matched nowhere at all, for any asset type, while
Settings happily offers both identifiers on machines and PCs. A tag an operator
is told to record has to be findable or it is a write-only field. USB devices
and printed items were unreachable from search entirely - neither is an asset,
so the generic asset search could not see them and no searcher existed; they
now match on serial, asset tag, label, bin code and gage-lab tag, honouring
isactive, with Settings toggles and result labels to match.

The retired-application rule was half a rule: GET /api/knowledgebase hid
articles whose topic application is retired while global search still returned
them and printed the retired application as the subject. A filter is only real
if every path that reaches the row applies it.

Contract to 0.20.0 (additive): Asset gained levelid and mapverifiedat, Location
gained levelid, and resolve_asset_position returns the levelid belonging to
whichever source supplied the coordinates. The five plugins that write a map
position are re-pinned. The install-list text format gained levelid as a NINTH
field, appended, because the shipped Pascal installer reads fields 0-7 by index.

That installer still compiles in one drawing's dimensions and bundles one
blueprint, so its map is accurate for the default level only; /api/maplevels is
deliberately unauthenticated so it can read both at runtime once rebuilt.
Recorded in PRINTER-INSTALLER.md section 6 along with the other known gaps.

Migration 7d33 converts an existing single-map site into one building and one
default level carrying the old map_* settings, then assigns every placed asset
and location to it. Nothing moves on screen. Old settings rows are kept so a
rollback still finds them. Verified end to end on MySQL 5.6 from a
production-shaped database.

plugins/printers/frontend/views/PrinterInstallerMap.vue

@@ -43,7 +43,7 @@
 import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
 import L from 'leaflet'
 import 'leaflet/dist/leaflet.css'
-import { loadMapConfig, blueprintUrlFor, state as mapConfig } from '@/composables/mapConfig'
+import { loadMapConfig, blueprintUrlFor, dimensionsFor, state as mapConfig } from '@/composables/mapConfig'
 import { printersApi } from '@/api'
 import { withBase } from '@/utils/basePath'
 import { currentTheme } from '@/stores/theme'
@@ -55,8 +55,10 @@ const selected = ref({})   // printerid -> true
 let map = null
 let imageOverlay = null
 let markers = {}           // printerid -> circleMarker
-let MAP_WIDTH = mapConfig.width
-let MAP_HEIGHT = mapConfig.height
+// The level being shown. The installer map runs before anyone logs in, which is
+// why /api/maplevels is public - without it there is no blueprint to draw.
+let MAP_WIDTH = 0
+let MAP_HEIGHT = 0
 
 const SELECTED_COLOR = '#e53935'
 const NORMAL_COLOR = '#4CAF50'
@@ -120,13 +122,13 @@ function renderMarkers() {
 }
 
 watch(currentTheme, (theme) => {
-  if (imageOverlay) imageOverlay.setUrl(blueprintUrlFor(theme))
+  if (imageOverlay) imageOverlay.setUrl(blueprintUrlFor(theme, mapConfig.currentlevelid))
 })
 
 onMounted(async () => {
   await loadMapConfig()
-  MAP_WIDTH = mapConfig.width
-  MAP_HEIGHT = mapConfig.height
+  MAP_WIDTH = dimensionsFor(mapConfig.currentlevelid).width
+  MAP_HEIGHT = dimensionsFor(mapConfig.currentlevelid).height
 
   try {
     const response = await printersApi.installList()
@@ -142,7 +144,7 @@ onMounted(async () => {
     attributionControl: false,
   })
   const bounds = [[0, 0], [MAP_HEIGHT, MAP_WIDTH]]
-  imageOverlay = L.imageOverlay(blueprintUrlFor(currentTheme.value), bounds).addTo(map)
+  imageOverlay = L.imageOverlay(blueprintUrlFor(currentTheme.value, mapConfig.currentlevelid), bounds).addTo(map)
   map.setView([MAP_HEIGHT / 2, MAP_WIDTH / 2], -2)
   map.setMaxBounds(bounds)
   renderMarkers()