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.

deploy/nginx-gallery.conf

@@ -1,4 +1,9 @@
-# Reverse proxy for gallery.mysuperlab.netcraze.pro → Node on port 3520.
+# Reverse proxy for gallery.mysuperlab.netcraze.pro → Vite dev client on :5173.
+# Vite proxies /api and /images to the Node API on :3520 (see client/vite.config.ts).
+#
+# Dev stack: npm run dev:server && npm run dev:client
+# Production (built SPA on Node only): point location / at http://127.0.0.1:3520 instead.
+#
 # Install: copy to /etc/nginx/sites-available/gallery, symlink sites-enabled, nginx -t && systemctl reload nginx
 
 server {
@@ -8,8 +13,10 @@ server {
     client_max_body_size 20M;
 
     location / {
-        proxy_pass http://127.0.0.1:3520;
+        proxy_pass http://127.0.0.1:5173;
         proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;