feat: progress notes UI, search/filter, chat backend relay (HQ-21)

- Add progress note input to TaskDetailPanel (textarea + Cmd+Enter submit)
- Add addProgressNote API function
- Add search bar and priority filter to Queue page
- Include chat backend: WebSocket relay (gateway-relay.ts), chat routes (chat.ts)
- Chat frontend updated to connect via backend relay (/api/chat/ws)

frontend/nginx.conf

@@ -8,12 +8,19 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
-    # Proxy API requests to backend
+    # Proxy API requests to backend (including WebSocket for chat)
     location /api/ {
         proxy_pass http://backend:3100;
         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;
+
+        # WebSocket support
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_read_timeout 86400;
     }
 
     location /health {