fix(infra): WS长连接proxy_read_timeout调整为3600s

承接 #2259，/api/ 反代的 read timeout 300s 会导致 WS 长连接
5分钟无消息即被 nginx 断开，调整为 3600s（HTTP API 不受影响）。

infra/docker/nginx-production.conf

@@ -40,7 +40,9 @@ server {
         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 300s;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_read_timeout 3600s;
         proxy_send_timeout 300s;
         proxy_request_buffering off;
     }

infra/docker/nginx-staging.conf

@@ -39,7 +39,9 @@ server {
         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 300s;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_read_timeout 3600s;
         proxy_send_timeout 300s;
         proxy_request_buffering off;
     }