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/vite.config.js

@@ -0,0 +1,29 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import path from 'path'
+
+export default defineConfig({
+  // Mount path of the built app. Default '/' (own IIS site / dev). Set
+  // VITE_BASE_PATH='/ops/' (trailing slash) to build for a subpath mount under
+  // Default Web Site, e.g. `VITE_BASE_PATH=/ops/ npm run build`.
+  base: process.env.VITE_BASE_PATH || '/',
+  plugins: [vue()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src')
+    }
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:5001',
+        changeOrigin: true
+      },
+      '/static': {
+        target: 'http://localhost:5001',
+        changeOrigin: true
+      }
+    }
+  }
+})