fix: reload native apps on settings change without reboot

[MayNiklas]

Summary

• Native app toggles (TIM, DAT, HUM, TEMP, BAT) now take effect immediately when changed via the settings API, without requiring a reboot.
• Calls loadNativeApps() after applyAllSettings() when any native app toggle is modified.
• Removes the stale "(requires reboot)" notices from the API docs.

Motivation

Previously, toggling native apps on or off via the API had no visible effect until the device was rebooted.

Test plan

• Send a settings update disabling a native app (e.g. {"TIM": false}) and verify it disappears from the app cycle without rebooting.
• Re-enable the app and verify it reappears immediately.
• Confirm other settings changes (non-native-app keys) still work as before.