fix: SSE 연결을 위한 nginx 설정 변경

Author: seaniiio

backend/nginx/conf.d/default.conf

@@ -11,6 +11,13 @@ server {
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
             add_header X-Service-Version $service_version always;
+
+            # SSE(Server-Sent Events) 지원을 위한 설정
+            proxy_http_version 1.1;
+            proxy_set_header Connection "";
+            proxy_buffering off;
+            proxy_cache off;
+            chunked_transfer_encoding on;
         }
    }