Add seed scripts, proxy Vite on public domain, and seed painting images.

Restore seed-wikipedia.js and seed-catalog-data.js so npm run setup works on a fresh clone. Point nginx at the Vite dev client and allow the public hostname in Vite config.

client/vite.config.ts

@@ -10,6 +10,8 @@ export default defineConfig(({ mode }) => {
   return {
     plugins: [react()],
     server: {
+      host: true,
+      allowedHosts: ['gallery.mysuperlab.netcraze.pro', 'localhost'],
       proxy: {
         '/api': apiTarget,
         '/images': apiTarget,