Function register_startup_tasks 

pub fn register_startup_tasks(
    manager: &mut TaskManager,
    hub: Sender<Event>,
    _settings: &Settings,
)

Registers background tasks that run at startup.

Call this during startup to add background tasks. Currently registers:

• wifi_status_monitor::WifiStatusMonitorTask - monitors WiFi status via dhcpcd-dbus (kobo only)
• hello_world::HelloWorldTask - prints “Hello world!” every minute (test only)
• dbus_monitor::DbusMonitorTask - monitors D-Bus signals (test + kobo only, when settings.logging.enable_dbus_log is true)