feat: Update changelog and configuration for version 0.5.51

- Set default `force_ipv4_dns` to true to prevent web_fetch timeouts in HAOS VMs.
- Introduced `nginx_log_level` option to control access log verbosity.
- Updated translations for new configuration options.

openclaw_assistant/nginx.conf.tpl

@@ -9,8 +9,8 @@ http {
   include       /etc/nginx/mime.types;
   default_type  application/octet-stream;
 
-  # Log to stdout/stderr (container-friendly)
-  access_log /dev/stdout;
+  # Logging (configurable via nginx_log_level option)
+  __NGINX_ACCESS_LOG__
   error_log  /dev/stderr notice;
 
   sendfile        on;