Function run_app 

pub async fn run_app<A: DfeApp>(app: A) -> Result<(), CliError>

Available on crate feature cli only.

Drive the standard DFE service lifecycle.

Handles subcommand dispatch:

• run (default): init logger → load config → run service
• version: print version info and exit
• config-check: load config, validate, print summary

Errors

Returns CliError if any lifecycle step fails.