fix: stream large graph JSON imports

deploy/nginx/travel-kg.conf.example

@@ -40,6 +40,21 @@ server {
         proxy_set_header X-Forwarded-Proto https;
     }
 
+    # Only graph file import accepts a large request. The API independently
+    # limits the file to GRAPH_IMPORT_MAX_BYTES (default 1 GiB); allow room for
+    # multipart headers/Schema. All other endpoints retain the 55m limit.
+    location = /v1/admin/projects/provision-file {
+        client_max_body_size 1030m;
+        proxy_pass http://127.0.0.1:8102;
+        include proxy_params;
+        proxy_set_header X-Forwarded-Proto https;
+        proxy_http_version 1.1;
+        proxy_request_buffering off;
+        proxy_buffering off;
+        proxy_read_timeout 120s;
+        proxy_send_timeout 120s;
+    }
+
     location / {
         proxy_pass http://127.0.0.1:8102;
         include proxy_params;