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/main.js

@@ -0,0 +1,21 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import router from './router'
+import App from './App.vue'
+
+// Locally-bundled Inter (air-gap safe, no Google Fonts fetch)
+import '@fontsource-variable/inter'
+
+// Initialize theme on app load
+import './stores/theme'
+import { applyBranding } from './utils/siteSettings'
+
+const app = createApp(App)
+
+app.use(createPinia())
+app.use(router)
+
+app.mount('#app')
+
+// Apply per-site favicon + brand color once settings load (no-op on defaults).
+applyBranding()