chore: remove old systemd udev service

[luytan]

Description

Remove the deprecated systemd-udev-settle.service
Fixes #195

TODO

• Copy-Paste this line

Checklist:

• My code follows the style guidelines of this project (cargo fmt)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the mdBook documentation
• My changes generate no new warnings (clippy/clang)
• New and existing unit tests pass locally with my changes (either use nix flake check or wait for the ci)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: bd86c5d5-6773-480e-87b7-76ebdae2d3b0

📥 Commits

Reviewing files that changed from the base of the PR and between 1d7222c and fe9513e.

📒 Files selected for processing (1)

• assets/cardwired.service

💤 Files with no reviewable changes (1)

• assets/cardwired.service

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Improved Cardwire service startup behavior by removing unnecessary service dependencies.
  • Cardwire now starts in the correct order relative to the system message bus.

Walkthrough

The Cardwire systemd unit no longer starts after systemd-udev-settle.service. It retains dbus.service as its only startup ordering dependency.

Changes

Cardwire service startup

Layer / File(s)	Summary
Remove deprecated startup dependency assets/cardwired.service	The unit removes the systemd-udev-settle.service dependency and retains ordering after dbus.service. This clears the deprecated invocation from the startup spell.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to fe951

This is a narrowly scoped service-file cleanup removing two lines; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the removal of the obsolete systemd udev service dependency.
Description check	✅ Passed	The description includes the change summary, linked issue, template sections, and checklist.
Linked Issues check	✅ Passed	The change removes the deprecated systemd-udev-settle.service dependency from cardwired.service as required by issue #195.
Out of Scope Changes check	✅ Passed	The pull request changes only the relevant systemd dependency declarations and contains no unrelated modifications.

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