fix: add proxy_read_timeout 300s to admin-compliance location block

Scan endpoint needs up to 3-5 min (multi-page crawl + LLM calls).
Without explicit timeout, nginx defaults to 60s → 504 Gateway Timeout.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nginx/conf.d/default.conf

@@ -318,6 +318,8 @@ server {
         set $upstream_admin_compliance bp-compliance-admin:3000;
         proxy_pass http://$upstream_admin_compliance;
         proxy_http_version 1.1;
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection "upgrade";
         proxy_set_header Host $host;