Sam Rolfe d7802bddb1 fix(ollama): toggle the NixOS system service on .27, not the deleted user unit ...

The ollama card was wired to 'systemctl --user', but the .27 user unit was
removed when Ollama moved to services.ollama (NixOS system service). The panel
therefore reported Stopped while the service was Running and its buttons failed.

- new controller kind 'systemd-system' -> sudo -n <canonical systemctl> ...
- resolve systemctl to its store path first: NixOS puts a symlink on PATH but
  the NOPASSWD sudoers rule names the store path, so bare 'sudo systemctl' does
  not match (verified: full path exit=0, bare name 'a password is required')
- _remote() now shlex.join()s the remote command; ssh joins trailing argv with
  spaces, which was word-splitting the 'sh -c' wrapper and failing with a sudo
  usage error
- services.toml: ollama -> kind=systemd-system, target=ollama (matches the
  sudoers rule verbatim), default_state=running
- docs/portal-architecture.md: document the three controller kinds + gotchas

Verified end-to-end from .13: start->running, stop->stopped, start->running,
real systemctl agrees, and /v1/models lists both qwen2.5 models over the LAN.

2026-10-12 16:29:10 +11:00

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