add WebSocket support for real-time delivery updates with JWT authentication and automatic reconnection

frontend/nginx.conf

@@ -49,6 +49,20 @@ server {
         expires 0;
     }
 
+    # WebSocket endpoint — long-lived connections need extended timeouts
+    location = /api/ws {
+        proxy_pass http://backend:8080;
+        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;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+
     # Proxy API requests to backend
     location /api/ {
         proxy_pass http://backend:8080;