Here is the rule in English:
Any HTTP request other than those for index.php, assets folder, files folder and robots.txt is treated as a request for your
You can add this to your config:
location ~* ^/(assets|files|robots\.txt) { }
This will work correctly with your location /
rule.
Your config also need to add root document and default index file.
...
root /ftp/wardrobe;
index index.php index.html index.htm;
location / {
try_files $uri $uri/ /index.php?/$request_uri;
}
location ~* ^/(assets|files|robots\.txt) { }
...