Add batch ULINE label printing for all asset types

A multi-select batch sheet at /print/asset-label-batch/<type> lays
selected assets onto ULINE label pages (6-up 3x3 or dense 72-up mini),
with code-type and encode toggles matching the single label, plus a
start-cell offset for partial sheets. Print Labels buttons on all five
asset list pages. The per-type config and encode resolution are
extracted to a shared print/assetLabel.js used by both the single and
batch views. Measuring-tool batches encode each tool inspection-
operation code (decode-verified 0615).

808 tests pass.

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

frontend/src/router/index.js

@@ -85,6 +85,12 @@ const routes = [
     name: 'print-asset-label',
     component: () => import('../views/print/AssetLabel.vue')
   },
+  // Batch label sheets (ULINE 6-up / mini 72-up) for one asset type.
+  {
+    path: '/print/asset-label-batch/:assettype',
+    name: 'print-asset-label-batch',
+    component: () => import('../views/print/AssetLabelBatch.vue')
+  },
   {
     path: '/print/printer-qr',
     name: 'print-printer-qr-batch',