Add Nostr relay + seed data to Docker deployment

- Add nostr-rs-relay service to docker-compose for persistent
  comments, reactions, and profiles on the dev server
- Add one-shot seeder container that auto-populates the relay
  with test personas, reactions, and comments on first deploy
- Proxy WebSocket connections through nginx at /relay so the
  frontend connects to the relay on the same host (no CORS)
- Make relay URL dynamic: reads from VITE_NOSTR_RELAYS in dev,
  auto-detects /relay proxy path in production Docker builds
- Make seed scripts configurable via RELAY_URL and ORIGIN env vars
- Add wait-for-relay script for reliable container orchestration
- Add "Resume last played" hero banner on My List tab

Co-authored-by: Cursor <cursoragent@cursor.com>

nginx.conf

@@ -27,6 +27,22 @@ server {
         add_header Cache-Control "public, immutable";
     }
 
+    # WebSocket proxy to Nostr relay (Docker service)
+    location /relay {
+        resolver 127.0.0.11 valid=30s ipv6=off;
+        set $relay_upstream http://relay:8080;
+
+        rewrite ^/relay(.*) /$1 break;
+        proxy_pass $relay_upstream;
+        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_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+
     # Vue Router - SPA fallback
     location / {
         try_files $uri $uri/ /index.html;