Loads config from standard paths using app name.
Candidate paths: - `./<appName>.properties` - `./<appName>.conf` - `$HOME/.config/<appName>/config.properties` - `/etc/ <appName>/config.properties`
| appName |
application name. |
|
Result.ok(loaded AppConfig), or Result.error(AppConfigError.INVALID_ARGUMENT / LOAD_FAILED). |