printedparts stage 3: read API + list page (first visible win)

GET /items (paginated, search across code/name/description/bin,
lowstock filter) and GET /items/<id> with recent transactions, both
open reads. printedpartsApi client, router file repointed at the
renamed views, PrintedItemsList with image thumbs and a red/green
quantity badge against the per-item threshold. Nav entry '3D Parts'
with a new 'box' Lucide icon mapping (the sidebar renders nothing for
unknown icon names - lab gotcha).

frontend/src/router/routes/printedparts.js

@@ -11,25 +11,25 @@ export default [
   {
     path: 'printedparts',
     name: 'printedparts',
-    component: () => import('../../views/printedparts/PrintedpartsList.vue'),
+    component: () => import('../../views/printedparts/PrintedItemsList.vue'),
     meta: { plugin: 'printedparts' }
   },
   {
     path: 'printedparts/new',
     name: 'printedparts-new',
-    component: () => import('../../views/printedparts/PrintedpartsForm.vue'),
+    component: () => import('../../views/printedparts/PrintedItemForm.vue'),
     meta: { requiresAuth: true, plugin: 'printedparts' }
   },
   {
     path: 'printedparts/:id',
     name: 'printedparts-detail',
-    component: () => import('../../views/printedparts/PrintedpartsDetail.vue'),
+    component: () => import('../../views/printedparts/PrintedItemDetail.vue'),
     meta: { plugin: 'printedparts' }
   },
   {
     path: 'printedparts/:id/edit',
     name: 'printedparts-edit',
-    component: () => import('../../views/printedparts/PrintedpartsForm.vue'),
+    component: () => import('../../views/printedparts/PrintedItemForm.vue'),
     meta: { requiresAuth: true, plugin: 'printedparts' }
   }
 ]