add kingmaker-style header, full pagination, and CI/CD deployment

- Hero carousel header with logo and photos matching kingmaker site
- Renamed "League Rank" to "ITC Rank"
- Full cursor-paginated standings scan with circular-cursor detection
  to handle BCP API's pagination bug at the end of results; incremental
  rendering shows results as each page arrives
- credentials:omit on all BCP fetches to prevent session cookie 500s
- GitLab CI pipeline: npm ci + vite build, rsync dist/ to
  /var/www/domains/gateway-gamers.net/rankings/ on push to main
- nginx config for rankings.gateway-gamers.net with CSP allowing
  connect-src to newprod-api.bestcoastpairings.com

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

rankings.gateway-gamers.net.conf

@@ -0,0 +1,36 @@
+server {
+    listen 80;
+    listen [::]:80;
+    server_name rankings.gateway-gamers.net;
+    return 301 https://$host$request_uri;
+}
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    server_name rankings.gateway-gamers.net;
+
+    root /var/www/domains/gateway-gamers.net/rankings;
+    index index.html;
+
+    # SSL — managed by Certbot
+    # ssl_certificate /etc/letsencrypt/live/rankings.gateway-gamers.net/fullchain.pem;
+    # ssl_certificate_key /etc/letsencrypt/live/rankings.gateway-gamers.net/privkey.pem;
+    # include /etc/letsencrypt/options-ssl-nginx.conf;
+    # ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
+
+    # Hide nginx version
+    server_tokens off;
+
+    # Security headers
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self'; connect-src 'self' https://newprod-api.bestcoastpairings.com; img-src 'self' data:;" always;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+}