Wire measuring tools into identifiers and global search

The measuringtools plugin was missing from two cross-cutting surfaces:
the asset-identifier matrix (no measuring_tool column or per-type
keys - gauge lab reference is their primary identifier) and global
search (results fell to a generic URL and gaugelabreference was never
searched). Measuring tools now have identifier toggles, gated
gauge-lab and maintenance-reference fields on their form and detail,
a search domain toggle, gage-tag search, and proper labels, routes,
and filter chips in search results.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/composables/identifierSettings.js

@@ -14,7 +14,7 @@ const state = reactive({
 
 let inflight = null
 
-const KEY_RE = /^identifier_(.+?)(?:_(machine|computer|printer|network_device))?_enabled$/
+const KEY_RE = /^identifier_(.+?)(?:_(machine|computer|printer|network_device|measuring_tool))?_enabled$/
 
 function applySetting(key, value) {
   const match = KEY_RE.exec(key)