Add CI workflow, admin frontend, Prometheus/Grafana monitoring, Cloudflare cache rules and worker, Nginx config, CONTRIBUTING.md and update docker-compose.yml

infrastructure/nginx/nginx.conf

@@ -0,0 +1,40 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    server {
+        listen 80;
+        server_name localhost;
+
+        root /usr/share/nginx/html;
+        index index.html;
+
+        # Serve static frontend
+        location / {
+            try_files $uri $uri/ /index.html;
+        }
+
+        # Proxy chat WebSocket
+        location /ws {
+            proxy_pass http://chat:3000;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+            proxy_set_header Host $host;
+        }
+
+        # Serve HLS from playout (with cache headers for Cloudflare)
+        location /hls/ {
+            alias /usr/share/nginx/html/hls/;
+            add_header Cache-Control "public, max-age=3600";
+            add_header Access-Control-Allow-Origin "*";
+        }
+
+        # Health checks
+        location /health {
+            return 200 "healthy";
+            add_header Content-Type text/plain;
+        }
+    }
+}