Fix /etc/micronas dir permissions: 750 root:www-data so Apache can traverse

700 blocked www-data from entering the dir even though the passwd file
had correct group permissions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -48,7 +48,8 @@ python3 -m venv /opt/micronas/venv
 
 ```bash
 mkdir -p /etc/micronas
-chmod 700 /etc/micronas
+chmod 750 /etc/micronas
+chown root:www-data /etc/micronas
 ```
 
 Credentials are set on first login via the `/setup` page in the browser. No manual env file editing needed.