fix: remove strong requirements in systemd unit

[lucarin91]

Motivation

Requires in systemd unit is too strict and ties two much arduino-app-cli wth the arduino-rotuer. So if the router is disabled or stopped, the app-cli daemon will be too. This is not necessary and creates some strange behavior during system updates.

Change description

Removed requires field.

Additional Notes

Reviewer checklist

• PR addresses a single concern.
• PR title and description are properly filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.

[lucarin91]

With some test on the board, I verify that the router is not stopping or disabling the app-cli daemon, as expected.

test start/stop of arduino-rotuer

1. sudo systemctl status arduino-app-cli -> running 🟢
2. sudo systemctl status arduino-router -> running 🟢
3. sudo systemctl stop arduino-router
4. sudo systemctl status arduino-router -> dead 🔴
5. sudo systemctl status arduino-app-cli -> running 🟢

test enable/disable of arduino-rotuer

1. sudo systemctl status arduino-app-cli -> enabled 🟢
2. sudo systemctl status arduino-router -> enabled 🟢
3. sudo systemctl disable arduino-router
4. sudo systemctl status arduino-router -> disabled 🟡
5. sudo systemctl status arduino-app-cli -> enabled 🟢