Match relay in the save/login service: WebSocket rooms, seats, ready, 100 ms turn confirmation and checksum relay

nginx.conf

@@ -19,6 +19,18 @@ server {
     }
     # savegame service (server/). Resolved at request time, so the game still starts without it;
     # the game then falls back to savegame files.
+    # match relay WebSocket (server/src/netplay.rs)
+    location /api/netplay/ws {
+        resolver 127.0.0.11 valid=10s ipv6=off;
+        set $saves http://saves:8080;
+        proxy_pass $saves;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+    }
     location /api/ {
         resolver 127.0.0.11 valid=10s ipv6=off;
         set $saves http://saves:8080;