fix: Add WebSocket proxy configuration to nginx

The nginx.conf was missing a location block for /ws/ paths, causing
WebSocket connections to fall through to the SPA catch-all and return
index.html instead of proxying to Django/Daphne.

Added proper WebSocket proxy configuration with:
- HTTP/1.1 upgrade headers for WebSocket protocol
- 24-hour read timeout for long-lived connections
- Standard proxy headers for Django

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/nginx.conf

@@ -63,6 +63,19 @@ http {
             proxy_set_header X-Forwarded-Proto $scheme;
         }
 
+        # Proxy WebSocket connections to Django (Daphne/ASGI)
+        location /ws/ {
+            proxy_pass http://django:5000;
+            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 86400;
+        }
+
         # Proxy Static/Media to Django (if served by WhiteNoise/Django)
         location /static/ {
             proxy_pass http://django:5000;