Fix #15691: Increase Nginx timeouts for big uploads

deployment/roles/reverse/templates/nginx/conf.d/vhosts.conf.j2

@@ -60,6 +60,16 @@ server {
     # Please be aware that browsers cannot correctly display this error.
     # Setting size to 0 disables checking of client request body size.
     client_max_body_size 0;
+
+    # Increase send timeout to allow the upstream more time to consume the stream.
+    # This prevents "Early EOF" errors during large uploads if the backend slows down.
+    # Note: This is a timeout between two successive write operations, not for the total duration.
+    proxy_send_timeout 600s;
+
+    # Increase read timeout to allow the backend to process the file after the upload is complete.
+    # Essential for large ZIPs where post-upload tasks can take some time.
+    # Note: This is a timeout between two successive read operations from the upstream.
+    proxy_read_timeout 600s;
   }
 {% endif %}
 
@@ -101,6 +111,16 @@ server {
     # Please be aware that browsers cannot correctly display this error.
     # Setting size to 0 disables checking of client request body size.
     client_max_body_size 0;
+
+    # Increase send timeout to allow the upstream more time to consume the stream.
+    # This prevents "Early EOF" errors during large uploads if the backend slows down.
+    # Note: This is a timeout between two successive write operations, not for the total duration.
+    proxy_send_timeout 600s;
+
+    # Increase read timeout to allow the backend to process the file after the upload is complete.
+    # Essential for large ZIPs where post-upload tasks can take some time.
+    # Note: This is a timeout between two successive read operations from the upstream.
+    proxy_read_timeout 600s;
   }
 {% endif %}
 {% if groups.get('hosts_ui_design_system', []) | length > 0 %}