#418 feat(makefile): add platform-specific service restart commands

Summary

• Add new services target that detects OS and calls appropriate service manager
• launchctl targets now only run on macOS (via the services target)
• Add systemctl targets for Linux (code-syncer, dotfiles-updater, ollama)
• Update switch target to use platform-aware services target

Test plan

• Verify make switch works correctly on macOS (calls launchctl targets)
• Verify make switch works correctly on Linux (calls systemctl targets)
• Verify individual make systemctl-* targets work on Linux

🤖 Generated with Claude Code

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Summary by cubic

Adds a platform-aware services target so make switch restarts the right user services on each OS. On macOS it uses launchctl; on Linux it uses systemd user units.

• New Features
  • Added services target that detects OS and routes to launchctl (macOS) or systemctl (Linux).
  • Added systemctl targets for code-syncer, dotfiles-updater, and ollama, plus a systemctl aggregate target.
  • Updated switch to call services; launchctl restarts now run only on macOS.