fix: harden backend production deployment

deploy/nginx/whaletownend-v2.conf.example

@@ -0,0 +1,28 @@
+server {
+    listen 80;
+    server_name whaletownend.xinghangee.icu;
+
+    client_max_body_size 24m;
+
+    location /game {
+        proxy_pass http://127.0.0.1:3001/game;
+        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 3600s;
+        proxy_send_timeout 3600s;
+    }
+
+    location / {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_http_version 1.1;
+        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;
+    }
+}