feat(nginx): add /graphql proxy to frontend server block

Route /graphql requests to API backend alongside /v1/ and /s/.

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

Author: ImTotem

infra/nginx/bcsd-api.conf.template

@@ -124,6 +124,17 @@ server {
         proxy_read_timeout 60s;
     }
 
+    location /graphql {
+        proxy_pass http://api_blue;
+        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;
+        proxy_set_header Connection "";
+        proxy_read_timeout 60s;
+    }
+
     location / {
         proxy_pass http://frontend;
         proxy_http_version 1.1;