fix: address review feedback on proxy timeout

- Fix disable logic: timeout editable when proxy is stopped
- Remove hardcoded proxy_connect_timeout (60s is nginx default)
- Remove misleading '0 for no timeout' helper text
- Add min:1 validation for timeout value

app/Actions/Database/StartDatabaseProxy.php

@@ -70,7 +70,6 @@ class StartDatabaseProxy
             listen $database->public_port;
             proxy_pass $containerName:$internalPort;
             $timeoutConfig
-            proxy_connect_timeout 60s;
        }
     }
     EOF;