Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

frontend/src/router/routes/printers.js

@@ -0,0 +1,42 @@
+/**
+ * Printers plugin routes
+ */
+export default [
+  {
+    path: 'printers',
+    name: 'printers',
+    component: () => import('../../views/printers/PrintersList.vue'),
+    meta: { plugin: 'printers' }
+  },
+  {
+    path: 'printers/new',
+    name: 'printer-new',
+    component: () => import('../../views/printers/PrinterForm.vue'),
+    meta: { requiresAuth: true, plugin: 'printers' }
+  },
+  {
+    path: 'printers/:id',
+    name: 'printer-detail',
+    component: () => import('../../views/printers/PrinterDetail.vue'),
+    meta: { plugin: 'printers' }
+  },
+  {
+    path: 'printers/:id/edit',
+    name: 'printer-edit',
+    component: () => import('../../views/printers/PrinterForm.vue'),
+    meta: { requiresAuth: true, plugin: 'printers' }
+  },
+  // printer-specific settings
+  {
+    path: 'settings/modelsupplies',
+    name: 'model-supplies',
+    component: () => import('../../views/settings/ModelSuppliesList.vue'),
+    meta: { requiresAuth: true, plugin: 'printers' }
+  },
+  {
+    path: 'settings/printerdrivers',
+    name: 'printer-drivers',
+    component: () => import('../../views/settings/PrinterDriversList.vue'),
+    meta: { requiresAuth: true, requiresAdmin: true, plugin: 'printers' }
+  }
+]